<?php
/* For licensing terms, see /license.txt */

use Chamilo\CoreBundle\Entity\AccessUrl;
use Chamilo\CoreBundle\Entity\Course;
use Chamilo\CoreBundle\Entity\Session as SessionEntity;
use Chamilo\CoreBundle\Entity\SettingsCurrent;
use Chamilo\CoreBundle\Framework\Container;
use Chamilo\CourseBundle\Entity\CGroupInfo;
use Chamilo\CourseBundle\Entity\CItemProperty;
use Chamilo\ThemeBundle\Controller\ExceptionController;
use Chamilo\UserBundle\Entity\User;
use ChamiloSession as Session;
use Symfony\Component\Debug\Exception\FlattenException;
use Symfony\Component\Finder\Finder;
use Symfony\Component\Routing\Generator\UrlGeneratorInterface;

/**
 * This is a code library for Chamilo.
 * It is included by default in every Chamilo file (through including the global.inc.php)
 * This library is in process of being transferred to src/Chamilo/CoreBundle/Component/Utils/ChamiloApi.
 * Whenever a function is transferred to the ChamiloApi class, the places where it is used should include
 * the "use Chamilo\CoreBundle\Component\Utils\ChamiloApi;" statement.
 */

// PHP version requirement.
define('REQUIRED_PHP_VERSION', '7.2');
define('REQUIRED_MIN_MEMORY_LIMIT', '128');
define('REQUIRED_MIN_UPLOAD_MAX_FILESIZE', '10');
define('REQUIRED_MIN_POST_MAX_SIZE', '10');

// USER STATUS CONSTANTS
/** global status of a user: student */
define('STUDENT', 5);
/** global status of a user: course manager */
define('COURSEMANAGER', 1);
/** global status of a user: session admin */
define('SESSIONADMIN', 3);
/** global status of a user: human ressource manager */
define('DRH', 4);
/** global status of a user: human ressource manager */
define('ANONYMOUS', 6);
/** global status of a user: low security, necessary for inserting data from
 * the teacher through HTMLPurifier */
define('COURSEMANAGERLOWSECURITY', 10);
// Soft user status
define('PLATFORM_ADMIN', 11);
define('SESSION_COURSE_COACH', 12);
define('SESSION_GENERAL_COACH', 13);
define('COURSE_STUDENT', 14); //student subscribed in a course
define('SESSION_STUDENT', 15); //student subscribed in a session course
define('COURSE_TUTOR', 16); // student is tutor of a course (NOT in session)
define('STUDENT_BOSS', 17); // student is boss
define('INVITEE', 20);
define('HRM_REQUEST', 21); //HRM has request for vinculation with user

// Table of status
$_status_list[COURSEMANAGER] = 'teacher'; // 1
$_status_list[SESSIONADMIN] = 'session_admin'; // 3
$_status_list[DRH] = 'drh'; // 4
$_status_list[STUDENT] = 'user'; // 5
$_status_list[ANONYMOUS] = 'anonymous'; // 6
$_status_list[INVITEE] = 'invited'; // 20

// COURSE VISIBILITY CONSTANTS
/** only visible for course admin */
define('COURSE_VISIBILITY_CLOSED', 0);
/** only visible for users registered in the course */
define('COURSE_VISIBILITY_REGISTERED', 1);
/** Open for all registered users on the platform */
define('COURSE_VISIBILITY_OPEN_PLATFORM', 2);
/** Open for the whole world */
define('COURSE_VISIBILITY_OPEN_WORLD', 3);
/** Invisible to all except admin */
define('COURSE_VISIBILITY_HIDDEN', 4);

define('COURSE_REQUEST_PENDING', 0);
define('COURSE_REQUEST_ACCEPTED', 1);
define('COURSE_REQUEST_REJECTED', 2);
define('DELETE_ACTION_ENABLED', false);

// EMAIL SENDING RECIPIENT CONSTANTS
define('SEND_EMAIL_EVERYONE', 1);
define('SEND_EMAIL_STUDENTS', 2);
define('SEND_EMAIL_TEACHERS', 3);

// SESSION VISIBILITY CONSTANTS
define('SESSION_VISIBLE_READ_ONLY', 1);
define('SESSION_VISIBLE', 2);
define('SESSION_INVISIBLE', 3); // not available
define('SESSION_AVAILABLE', 4);

define('SESSION_LINK_TARGET', '_self');

define('SUBSCRIBE_ALLOWED', 1);
define('SUBSCRIBE_NOT_ALLOWED', 0);
define('UNSUBSCRIBE_ALLOWED', 1);
define('UNSUBSCRIBE_NOT_ALLOWED', 0);

// SURVEY VISIBILITY CONSTANTS
define('SURVEY_VISIBLE_TUTOR', 0);
define('SURVEY_VISIBLE_TUTOR_STUDENT', 1);
define('SURVEY_VISIBLE_PUBLIC', 2);

// CONSTANTS defining all tools, using the english version
/* When you add a new tool you must add it into function api_get_tools_lists() too */
define('TOOL_DOCUMENT', 'document');
define('TOOL_LP_FINAL_ITEM', 'final_item');
define('TOOL_READOUT_TEXT', 'readout_text');
define('TOOL_THUMBNAIL', 'thumbnail');
define('TOOL_HOTPOTATOES', 'hotpotatoes');
define('TOOL_CALENDAR_EVENT', 'calendar_event');
define('TOOL_LINK', 'link');
define('TOOL_LINK_CATEGORY', 'link_category');
define('TOOL_COURSE_DESCRIPTION', 'course_description');
define('TOOL_SEARCH', 'search');
define('TOOL_LEARNPATH', 'learnpath');
define('TOOL_LEARNPATH_CATEGORY', 'learnpath_category');
define('TOOL_AGENDA', 'agenda');
define('TOOL_ANNOUNCEMENT', 'announcement');
define('TOOL_FORUM', 'forum');
define('TOOL_FORUM_CATEGORY', 'forum_category');
define('TOOL_FORUM_THREAD', 'forum_thread');
define('TOOL_FORUM_POST', 'forum_post');
define('TOOL_FORUM_ATTACH', 'forum_attachment');
define('TOOL_FORUM_THREAD_QUALIFY', 'forum_thread_qualify');
define('TOOL_THREAD', 'thread');
define('TOOL_POST', 'post');
define('TOOL_DROPBOX', 'dropbox');
define('TOOL_QUIZ', 'quiz');
define('TOOL_TEST_CATEGORY', 'test_category');
define('TOOL_USER', 'user');
define('TOOL_GROUP', 'group');
define('TOOL_BLOGS', 'blog_management');
define('TOOL_CHAT', 'chat');
define('TOOL_STUDENTPUBLICATION', 'student_publication');
define('TOOL_TRACKING', 'tracking');
define('TOOL_HOMEPAGE_LINK', 'homepage_link');
define('TOOL_COURSE_SETTING', 'course_setting');
define('TOOL_BACKUP', 'backup');
define('TOOL_COPY_COURSE_CONTENT', 'copy_course_content');
define('TOOL_RECYCLE_COURSE', 'recycle_course');
define('TOOL_COURSE_HOMEPAGE', 'course_homepage');
define('TOOL_COURSE_RIGHTS_OVERVIEW', 'course_rights');
define('TOOL_UPLOAD', 'file_upload');
define('TOOL_COURSE_MAINTENANCE', 'course_maintenance');
define('TOOL_SURVEY', 'survey');
define('TOOL_WIKI', 'wiki');
define('TOOL_GLOSSARY', 'glossary');
define('TOOL_GRADEBOOK', 'gradebook');
define('TOOL_NOTEBOOK', 'notebook');
define('TOOL_ATTENDANCE', 'attendance');
define('TOOL_COURSE_PROGRESS', 'course_progress');
define('TOOL_PORTFOLIO', 'portfolio');
define('TOOL_PLAGIARISM', 'compilatio');

// CONSTANTS defining Chamilo interface sections
define('SECTION_CAMPUS', 'mycampus');
define('SECTION_COURSES', 'mycourses');
define('SECTION_CATALOG', 'catalog');
define('SECTION_MYPROFILE', 'myprofile');
define('SECTION_MYAGENDA', 'myagenda');
define('SECTION_COURSE_ADMIN', 'course_admin');
define('SECTION_PLATFORM_ADMIN', 'platform_admin');
define('SECTION_MYGRADEBOOK', 'mygradebook');
define('SECTION_TRACKING', 'session_my_space');
define('SECTION_SOCIAL', 'social-network');
define('SECTION_DASHBOARD', 'dashboard');
define('SECTION_REPORTS', 'reports');
define('SECTION_GLOBAL', 'global');
define('SECTION_INCLUDE', 'include');

// CONSTANT name for local authentication source
define('PLATFORM_AUTH_SOURCE', 'platform');
define('CAS_AUTH_SOURCE', 'cas');
define('LDAP_AUTH_SOURCE', 'extldap');

// CONSTANT defining the default HotPotatoes files directory
define('DIR_HOTPOTATOES', '/HotPotatoes_files');

// event logs types
define('LOG_COURSE_DELETE', 'course_deleted');
define('LOG_COURSE_CREATE', 'course_created');

// @todo replace 'soc_gr' with social_group
define('LOG_GROUP_PORTAL_CREATED', 'soc_gr_created');
define('LOG_GROUP_PORTAL_UPDATED', 'soc_gr_updated');
define('LOG_GROUP_PORTAL_DELETED', 'soc_gr_deleted');
define('LOG_GROUP_PORTAL_USER_DELETE_ALL', 'soc_gr_delete_users');

define('LOG_GROUP_PORTAL_ID', 'soc_gr_portal_id');
define('LOG_GROUP_PORTAL_REL_USER_ARRAY', 'soc_gr_user_array');

define('LOG_GROUP_PORTAL_USER_SUBSCRIBED', 'soc_gr_u_subs');
define('LOG_GROUP_PORTAL_USER_UNSUBSCRIBED', 'soc_gr_u_unsubs');
define('LOG_GROUP_PORTAL_USER_UPDATE_ROLE', 'soc_gr_update_role');

define('LOG_USER_DELETE', 'user_deleted');
define('LOG_USER_CREATE', 'user_created');
define('LOG_USER_ENABLE', 'user_enable');
define('LOG_USER_DISABLE', 'user_disable');
define('LOG_USER_ANONYMIZE', 'user_anonymized');
define('LOG_USER_FIELD_CREATE', 'user_field_created');
define('LOG_USER_FIELD_DELETE', 'user_field_deleted');
define('LOG_SESSION_CREATE', 'session_created');
define('LOG_SESSION_DELETE', 'session_deleted');
define('LOG_SESSION_ADD_USER_COURSE', 'session_add_user_course');
define('LOG_SESSION_DELETE_USER_COURSE', 'session_delete_user_course');
define('LOG_SESSION_ADD_USER', 'session_add_user');
define('LOG_SESSION_DELETE_USER', 'session_delete_user');
define('LOG_SESSION_ADD_COURSE', 'session_add_course');
define('LOG_SESSION_DELETE_COURSE', 'session_delete_course');

define('LOG_SESSION_CATEGORY_CREATE', 'session_cat_created'); //changed in 1.9.8
define('LOG_SESSION_CATEGORY_DELETE', 'session_cat_deleted'); //changed in 1.9.8
define('LOG_CONFIGURATION_SETTINGS_CHANGE', 'settings_changed');
define('LOG_PLATFORM_LANGUAGE_CHANGE', 'platform_lng_changed'); //changed in 1.9.8
define('LOG_SUBSCRIBE_USER_TO_COURSE', 'user_subscribed');
define('LOG_UNSUBSCRIBE_USER_FROM_COURSE', 'user_unsubscribed');
define('LOG_ATTEMPTED_FORCED_LOGIN', 'attempted_forced_login');

define('LOG_HOMEPAGE_CHANGED', 'homepage_changed');

define('LOG_PROMOTION_CREATE', 'promotion_created');
define('LOG_PROMOTION_DELETE', 'promotion_deleted');
define('LOG_CAREER_CREATE', 'career_created');
define('LOG_CAREER_DELETE', 'career_deleted');

define('LOG_USER_PERSONAL_DOC_DELETED', 'user_doc_deleted');
define('LOG_WIKI_ACCESS', 'wiki_page_view');

// All results from an exercise
define('LOG_EXERCISE_RESULT_DELETE', 'exe_result_deleted');

// Logs only the one attempt
define('LOG_EXERCISE_ATTEMPT_DELETE', 'exe_attempt_deleted');
define('LOG_LP_ATTEMPT_DELETE', 'lp_attempt_deleted');
define('LOG_QUESTION_RESULT_DELETE', 'qst_attempt_deleted');

define('LOG_MY_FOLDER_CREATE', 'my_folder_created');
define('LOG_MY_FOLDER_CHANGE', 'my_folder_changed');
define('LOG_MY_FOLDER_DELETE', 'my_folder_deleted');
define('LOG_MY_FOLDER_COPY', 'my_folder_copied');
define('LOG_MY_FOLDER_CUT', 'my_folder_cut');
define('LOG_MY_FOLDER_PASTE', 'my_folder_pasted');
define('LOG_MY_FOLDER_UPLOAD', 'my_folder_uploaded');

// Event logs data types (max 20 chars)
define('LOG_COURSE_CODE', 'course_code');
define('LOG_COURSE_ID', 'course_id');
define('LOG_USER_ID', 'user_id');
define('LOG_USER_OBJECT', 'user_object');
define('LOG_USER_FIELD_VARIABLE', 'user_field_variable');
define('LOG_SESSION_ID', 'session_id');

define('LOG_QUESTION_ID', 'question_id');
define('LOG_SESSION_CATEGORY_ID', 'session_category_id');
define('LOG_CONFIGURATION_SETTINGS_CATEGORY', 'settings_category');
define('LOG_CONFIGURATION_SETTINGS_VARIABLE', 'settings_variable');
define('LOG_PLATFORM_LANGUAGE', 'default_platform_language');
define('LOG_CAREER_ID', 'career_id');
define('LOG_PROMOTION_ID', 'promotion_id');
define('LOG_GRADEBOOK_LOCKED', 'gradebook_locked');
define('LOG_GRADEBOOK_UNLOCKED', 'gradebook_unlocked');
define('LOG_GRADEBOOK_ID', 'gradebook_id');
define('LOG_WIKI_PAGE_ID', 'wiki_page_id');
define('LOG_EXERCISE_ID', 'exercise_id');
define('LOG_EXERCISE_AND_USER_ID', 'exercise_and_user_id');
define('LOG_LP_ID', 'lp_id');
define('LOG_EXERCISE_ATTEMPT_QUESTION_ID', 'exercise_a_q_id');
define('LOG_EXERCISE_ATTEMPT', 'exe_id');

define('LOG_WORK_DIR_DELETE', 'work_dir_delete');
define('LOG_WORK_FILE_DELETE', 'work_file_delete');
define('LOG_WORK_DATA', 'work_data_array');

define('LOG_MY_FOLDER_PATH', 'path');
define('LOG_MY_FOLDER_NEW_PATH', 'new_path');

define('LOG_TERM_CONDITION_ACCEPTED', 'term_condition_accepted');
define('LOG_USER_CONFIRMED_EMAIL', 'user_confirmed_email');
define('LOG_USER_REMOVED_LEGAL_ACCEPT', 'user_removed_legal_accept');

define('LOG_USER_DELETE_ACCOUNT_REQUEST', 'user_delete_account_request');

define('LOG_QUESTION_CREATED', 'question_created');
define('LOG_QUESTION_UPDATED', 'question_updated');

define('USERNAME_PURIFIER', '/[^0-9A-Za-z_\.-]/');

//used when login_is_email setting is true
define('USERNAME_PURIFIER_MAIL', '/[^0-9A-Za-z_\.@]/');
define('USERNAME_PURIFIER_SHALLOW', '/\s/');

// This constant is a result of Windows OS detection, it has a boolean value:
// true whether the server runs on Windows OS, false otherwise.
define('IS_WINDOWS_OS', api_is_windows_os());

// iconv extension, for PHP5 on Windows it is installed by default.
define('ICONV_INSTALLED', function_exists('iconv'));
define('MBSTRING_INSTALLED', function_exists('mb_strlen')); // mbstring extension.

// Patterns for processing paths. Examples.
define('REPEATED_SLASHES_PURIFIER', '/\/{2,}/'); // $path = preg_replace(REPEATED_SLASHES_PURIFIER, '/', $path);
define('VALID_WEB_PATH', '/https?:\/\/[^\/]*(\/.*)?/i'); // $is_valid_path = preg_match(VALID_WEB_PATH, $path);
// $new_path = preg_replace(VALID_WEB_SERVER_BASE, $new_base, $path);
define('VALID_WEB_SERVER_BASE', '/https?:\/\/[^\/]*/i');
// Constants for api_get_path() and api_get_path_type(), etc. - registered path types.
// basic (leaf elements)
define('REL_CODE_PATH', 'REL_CODE_PATH');
define('REL_COURSE_PATH', 'REL_COURSE_PATH');
define('REL_HOME_PATH', 'REL_HOME_PATH');

// Constants for api_get_path() and api_get_path_type(), etc. - registered path types.
define('WEB_PATH', 'WEB_PATH');
define('SYS_PATH', 'SYS_PATH');
define('SYS_APP_PATH', 'SYS_APP_PATH');
define('SYS_UPLOAD_PATH', 'SYS_UPLOAD_PATH');
define('WEB_UPLOAD_PATH', 'WEB_UPLOAD_PATH');

define('REL_PATH', 'REL_PATH');
define('WEB_COURSE_PATH', 'WEB_COURSE_PATH');
define('SYS_COURSE_PATH', 'SYS_COURSE_PATH');
define('WEB_CODE_PATH', 'WEB_CODE_PATH');
define('SYS_CODE_PATH', 'SYS_CODE_PATH');
define('SYS_LANG_PATH', 'SYS_LANG_PATH');
define('WEB_IMG_PATH', 'WEB_IMG_PATH');
define('WEB_CSS_PATH', 'WEB_CSS_PATH');
define('WEB_PUBLIC_PATH', 'WEB_PUBLIC_PATH');
define('SYS_CSS_PATH', 'SYS_CSS_PATH');
define('SYS_PLUGIN_PATH', 'SYS_PLUGIN_PATH');
define('WEB_PLUGIN_PATH', 'WEB_PLUGIN_PATH');
define('WEB_PLUGIN_ASSET_PATH', 'WEB_PLUGIN_ASSET_PATH');
define('SYS_ARCHIVE_PATH', 'SYS_ARCHIVE_PATH');
define('WEB_ARCHIVE_PATH', 'WEB_ARCHIVE_PATH');
define('SYS_INC_PATH', 'SYS_INC_PATH');
define('LIBRARY_PATH', 'LIBRARY_PATH');
define('CONFIGURATION_PATH', 'CONFIGURATION_PATH');
define('WEB_LIBRARY_PATH', 'WEB_LIBRARY_PATH');
define('WEB_LIBRARY_JS_PATH', 'WEB_LIBRARY_JS_PATH');
define('WEB_AJAX_PATH', 'WEB_AJAX_PATH');
define('SYS_TEST_PATH', 'SYS_TEST_PATH');
define('WEB_TEMPLATE_PATH', 'WEB_TEMPLATE_PATH');
define('SYS_TEMPLATE_PATH', 'SYS_TEMPLATE_PATH');
define('SYS_PUBLIC_PATH', 'SYS_PUBLIC_PATH');
define('SYS_HOME_PATH', 'SYS_HOME_PATH');
define('WEB_HOME_PATH', 'WEB_HOME_PATH');
define('WEB_FONTS_PATH', 'WEB_FONTS_PATH');
define('SYS_FONTS_PATH', 'SYS_FONTS_PATH');

// Relations type with Course manager
define('COURSE_RELATION_TYPE_COURSE_MANAGER', 1);
define('SESSION_RELATION_TYPE_COURSE_MANAGER', 1);

// Relations type with Human resources manager
define('COURSE_RELATION_TYPE_RRHH', 1);
define('SESSION_RELATION_TYPE_RRHH', 1);

//User image sizes
define('USER_IMAGE_SIZE_ORIGINAL', 1);
define('USER_IMAGE_SIZE_BIG', 2);
define('USER_IMAGE_SIZE_MEDIUM', 3);
define('USER_IMAGE_SIZE_SMALL', 4);

// Relation type between users
define('USER_UNKNOWN', 0);
define('USER_RELATION_TYPE_UNKNOWN', 1);
define('USER_RELATION_TYPE_PARENT', 2); // should be deprecated is useless
define('USER_RELATION_TYPE_FRIEND', 3);
define('USER_RELATION_TYPE_GOODFRIEND', 4); // should be deprecated is useless
define('USER_RELATION_TYPE_ENEMY', 5); // should be deprecated is useless
define('USER_RELATION_TYPE_DELETED', 6);
define('USER_RELATION_TYPE_RRHH', 7);
define('USER_RELATION_TYPE_BOSS', 8);
define('USER_RELATION_TYPE_HRM_REQUEST', 9);

// Gradebook link constants
// Please do not change existing values, they are used in the database !
define('GRADEBOOK_ITEM_LIMIT', 1000);

define('LINK_EXERCISE', 1);
define('LINK_DROPBOX', 2);
define('LINK_STUDENTPUBLICATION', 3);
define('LINK_LEARNPATH', 4);
define('LINK_FORUM_THREAD', 5);
//define('LINK_WORK',6);
define('LINK_ATTENDANCE', 7);
define('LINK_SURVEY', 8);
define('LINK_HOTPOTATOES', 9);

// Score display types constants
define('SCORE_DIV', 1); // X / Y
define('SCORE_PERCENT', 2); // XX %
define('SCORE_DIV_PERCENT', 3); // X / Y (XX %)
define('SCORE_AVERAGE', 4); // XX %
define('SCORE_DECIMAL', 5); // 0.50  (X/Y)
define('SCORE_BAR', 6); // Uses the Display::bar_progress function
define('SCORE_SIMPLE', 7); // X
define('SCORE_IGNORE_SPLIT', 8); //  ??
define('SCORE_DIV_PERCENT_WITH_CUSTOM', 9); // X / Y (XX %) - Good!
define('SCORE_CUSTOM', 10); // Good!
define('SCORE_DIV_SIMPLE_WITH_CUSTOM', 11); // X - Good!
define('SCORE_DIV_SIMPLE_WITH_CUSTOM_LETTERS', 12); // X - Good!
define('SCORE_ONLY_SCORE', 13); // X - Good!
define('SCORE_NUMERIC', 14);

define('SCORE_BOTH', 1);
define('SCORE_ONLY_DEFAULT', 2);
define('SCORE_ONLY_CUSTOM', 3);

// From display.lib.php

define('MAX_LENGTH_BREADCRUMB', 100);
define('ICON_SIZE_ATOM', 8);
define('ICON_SIZE_TINY', 16);
define('ICON_SIZE_SMALL', 22);
define('ICON_SIZE_MEDIUM', 32);
define('ICON_SIZE_LARGE', 48);
define('ICON_SIZE_BIG', 64);
define('ICON_SIZE_HUGE', 128);
define('SHOW_TEXT_NEAR_ICONS', false);

// Session catalog
define('CATALOG_COURSES', 0);
define('CATALOG_SESSIONS', 1);
define('CATALOG_COURSES_SESSIONS', 2);

// Hook type events, pre-process and post-process.
// All means to be executed for both hook event types
define('HOOK_EVENT_TYPE_PRE', 0);
define('HOOK_EVENT_TYPE_POST', 1);
define('HOOK_EVENT_TYPE_ALL', 10);

define('CAREER_STATUS_ACTIVE', 1);
define('CAREER_STATUS_INACTIVE', 0);

define('PROMOTION_STATUS_ACTIVE', 1);
define('PROMOTION_STATUS_INACTIVE', 0);

// Group permissions
define('GROUP_PERMISSION_OPEN', '1');
define('GROUP_PERMISSION_CLOSED', '2');

// Group user permissions
define('GROUP_USER_PERMISSION_ADMIN', '1'); // the admin of a group
define('GROUP_USER_PERMISSION_READER', '2'); // a normal user
define('GROUP_USER_PERMISSION_PENDING_INVITATION', '3'); // When an admin/moderator invites a user
define('GROUP_USER_PERMISSION_PENDING_INVITATION_SENT_BY_USER', '4'); // an user joins a group
define('GROUP_USER_PERMISSION_MODERATOR', '5'); // a moderator
define('GROUP_USER_PERMISSION_ANONYMOUS', '6'); // an anonymous user
define('GROUP_USER_PERMISSION_HRM', '7'); // a human resources manager

define('GROUP_IMAGE_SIZE_ORIGINAL', 1);
define('GROUP_IMAGE_SIZE_BIG', 2);
define('GROUP_IMAGE_SIZE_MEDIUM', 3);
define('GROUP_IMAGE_SIZE_SMALL', 4);
define('GROUP_TITLE_LENGTH', 50);

// Exercise
// @todo move into a class
define('ALL_ON_ONE_PAGE', 1);
define('ONE_PER_PAGE', 2);

define('EXERCISE_FEEDBACK_TYPE_END', 0); //Feedback 		 - show score and expected answers
define('EXERCISE_FEEDBACK_TYPE_DIRECT', 1); //DirectFeedback - Do not show score nor answers
define('EXERCISE_FEEDBACK_TYPE_EXAM', 2); // NoFeedback 	 - Show score only
define('EXERCISE_FEEDBACK_TYPE_POPUP', 3); // Popup BT#15827

define('RESULT_DISABLE_SHOW_SCORE_AND_EXPECTED_ANSWERS', 0); //show score and expected answers
define('RESULT_DISABLE_NO_SCORE_AND_EXPECTED_ANSWERS', 1); //Do not show score nor answers
define('RESULT_DISABLE_SHOW_SCORE_ONLY', 2); //Show score only
define('RESULT_DISABLE_SHOW_FINAL_SCORE_ONLY_WITH_CATEGORIES', 3); //Show final score only with categories
define('RESULT_DISABLE_SHOW_SCORE_ATTEMPT_SHOW_ANSWERS_LAST_ATTEMPT', 4);
define('RESULT_DISABLE_DONT_SHOW_SCORE_ONLY_IF_USER_FINISHES_ATTEMPTS_SHOW_ALWAYS_FEEDBACK', 5);
define('RESULT_DISABLE_RANKING', 6);
define('RESULT_DISABLE_SHOW_ONLY_IN_CORRECT_ANSWER', 7);
define('RESULT_DISABLE_SHOW_SCORE_AND_EXPECTED_ANSWERS_AND_RANKING', 8);

define('EXERCISE_MAX_NAME_SIZE', 80);

// Question types (edit next array as well when adding values)
// @todo move into a class
define('UNIQUE_ANSWER', 1);
define('MULTIPLE_ANSWER', 2);
define('FILL_IN_BLANKS', 3);
define('MATCHING', 4);
define('FREE_ANSWER', 5);
define('HOT_SPOT', 6);
define('HOT_SPOT_ORDER', 7);
define('HOT_SPOT_DELINEATION', 8);
define('MULTIPLE_ANSWER_COMBINATION', 9);
define('UNIQUE_ANSWER_NO_OPTION', 10);
define('MULTIPLE_ANSWER_TRUE_FALSE', 11);
define('MULTIPLE_ANSWER_COMBINATION_TRUE_FALSE', 12);
define('ORAL_EXPRESSION', 13);
define('GLOBAL_MULTIPLE_ANSWER', 14);
define('MEDIA_QUESTION', 15);
define('CALCULATED_ANSWER', 16);
define('UNIQUE_ANSWER_IMAGE', 17);
define('DRAGGABLE', 18);
define('MATCHING_DRAGGABLE', 19);
define('ANNOTATION', 20);
define('READING_COMPREHENSION', 21);
define('MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY', 22);

define('EXERCISE_CATEGORY_RANDOM_SHUFFLED', 1);
define('EXERCISE_CATEGORY_RANDOM_ORDERED', 2);
define('EXERCISE_CATEGORY_RANDOM_DISABLED', 0);

// Question selection type
define('EX_Q_SELECTION_ORDERED', 1);
define('EX_Q_SELECTION_RANDOM', 2);
define('EX_Q_SELECTION_CATEGORIES_ORDERED_QUESTIONS_ORDERED', 3);
define('EX_Q_SELECTION_CATEGORIES_RANDOM_QUESTIONS_ORDERED', 4);
define('EX_Q_SELECTION_CATEGORIES_ORDERED_QUESTIONS_RANDOM', 5);
define('EX_Q_SELECTION_CATEGORIES_RANDOM_QUESTIONS_RANDOM', 6);
define('EX_Q_SELECTION_CATEGORIES_RANDOM_QUESTIONS_ORDERED_NO_GROUPED', 7);
define('EX_Q_SELECTION_CATEGORIES_RANDOM_QUESTIONS_RANDOM_NO_GROUPED', 8);
define('EX_Q_SELECTION_CATEGORIES_ORDERED_BY_PARENT_QUESTIONS_ORDERED', 9);
define('EX_Q_SELECTION_CATEGORIES_ORDERED_BY_PARENT_QUESTIONS_RANDOM', 10);

// Used to save the skill_rel_item table
define('ITEM_TYPE_EXERCISE', 1);
define('ITEM_TYPE_HOTPOTATOES', 2);
define('ITEM_TYPE_LINK', 3);
define('ITEM_TYPE_LEARNPATH', 4);
define('ITEM_TYPE_GRADEBOOK', 5);
define('ITEM_TYPE_STUDENT_PUBLICATION', 6);
//define('ITEM_TYPE_FORUM', 7);
define('ITEM_TYPE_ATTENDANCE', 8);
define('ITEM_TYPE_SURVEY', 9);
define('ITEM_TYPE_FORUM_THREAD', 10);

// one big string with all question types, for the validator in pear/HTML/QuickForm/Rule/QuestionType
define(
    'QUESTION_TYPES',
    UNIQUE_ANSWER.':'.
    MULTIPLE_ANSWER.':'.
    FILL_IN_BLANKS.':'.
    MATCHING.':'.
    FREE_ANSWER.':'.
    HOT_SPOT.':'.
    HOT_SPOT_ORDER.':'.
    HOT_SPOT_DELINEATION.':'.
    MULTIPLE_ANSWER_COMBINATION.':'.
    UNIQUE_ANSWER_NO_OPTION.':'.
    MULTIPLE_ANSWER_TRUE_FALSE.':'.
    MULTIPLE_ANSWER_COMBINATION_TRUE_FALSE.':'.
    ORAL_EXPRESSION.':'.
    GLOBAL_MULTIPLE_ANSWER.':'.
    MEDIA_QUESTION.':'.
    CALCULATED_ANSWER.':'.
    UNIQUE_ANSWER_IMAGE.':'.
    DRAGGABLE.':'.
    MATCHING_DRAGGABLE.':'.
    MULTIPLE_ANSWER_TRUE_FALSE_DEGREE_CERTAINTY.':'.
    ANNOTATION
);

//Some alias used in the QTI exports
define('MCUA', 1);
define('TF', 1);
define('MCMA', 2);
define('FIB', 3);

// Skills
define('SKILL_TYPE_REQUIREMENT', 'required');
define('SKILL_TYPE_ACQUIRED', 'acquired');
define('SKILL_TYPE_BOTH', 'both');

// Message
define('MESSAGE_STATUS_NEW', '0');
define('MESSAGE_STATUS_UNREAD', '1');
//2 ??
define('MESSAGE_STATUS_DELETED', '3');
define('MESSAGE_STATUS_OUTBOX', '4');
define('MESSAGE_STATUS_INVITATION_PENDING', '5');
define('MESSAGE_STATUS_INVITATION_ACCEPTED', '6');
define('MESSAGE_STATUS_INVITATION_DENIED', '7');
define('MESSAGE_STATUS_WALL', '8');
define('MESSAGE_STATUS_WALL_DELETE', '9');
define('MESSAGE_STATUS_WALL_POST', '10');
define('MESSAGE_STATUS_CONVERSATION', '11');
define('MESSAGE_STATUS_FORUM', '12');
define('MESSAGE_STATUS_PROMOTED', '13');

// Images
define('IMAGE_WALL_SMALL_SIZE', 200);
define('IMAGE_WALL_MEDIUM_SIZE', 500);
define('IMAGE_WALL_BIG_SIZE', 2000);
define('IMAGE_WALL_SMALL', 'small');
define('IMAGE_WALL_MEDIUM', 'medium');
define('IMAGE_WALL_BIG', 'big');

// Social PLUGIN PLACES
define('SOCIAL_LEFT_PLUGIN', 1);
define('SOCIAL_CENTER_PLUGIN', 2);
define('SOCIAL_RIGHT_PLUGIN', 3);
define('CUT_GROUP_NAME', 50);

/**
 * FormValidator Filter.
 */
define('NO_HTML', 1);
define('STUDENT_HTML', 2);
define('TEACHER_HTML', 3);
define('STUDENT_HTML_FULLPAGE', 4);
define('TEACHER_HTML_FULLPAGE', 5);

// Timeline
define('TIMELINE_STATUS_ACTIVE', '1');
define('TIMELINE_STATUS_INACTIVE', '2');

// Event email template class
define('EVENT_EMAIL_TEMPLATE_ACTIVE', 1);
define('EVENT_EMAIL_TEMPLATE_INACTIVE', 0);

// Course home
define('SHORTCUTS_HORIZONTAL', 0);
define('SHORTCUTS_VERTICAL', 1);

// Image class
define('IMAGE_PROCESSOR', 'gd'); // 'imagick' or 'gd' strings

// Course copy
define('FILE_SKIP', 1);
define('FILE_RENAME', 2);
define('FILE_OVERWRITE', 3);
define('UTF8_CONVERT', false); //false by default

define('DOCUMENT', 'file');
define('FOLDER', 'folder');

define('RESOURCE_ASSET', 'asset');
define('RESOURCE_DOCUMENT', 'document');
define('RESOURCE_GLOSSARY', 'glossary');
define('RESOURCE_EVENT', 'calendar_event');
define('RESOURCE_LINK', 'link');
define('RESOURCE_COURSEDESCRIPTION', 'course_description');
define('RESOURCE_LEARNPATH', 'learnpath');
define('RESOURCE_LEARNPATH_CATEGORY', 'learnpath_category');
define('RESOURCE_ANNOUNCEMENT', 'announcement');
define('RESOURCE_FORUM', 'forum');
define('RESOURCE_FORUMTOPIC', 'thread');
define('RESOURCE_FORUMPOST', 'post');
define('RESOURCE_QUIZ', 'quiz');
define('RESOURCE_TEST_CATEGORY', 'test_category');
define('RESOURCE_QUIZQUESTION', 'Exercise_Question');
define('RESOURCE_TOOL_INTRO', 'Tool introduction');
define('RESOURCE_LINKCATEGORY', 'Link_Category');
define('RESOURCE_FORUMCATEGORY', 'Forum_Category');
define('RESOURCE_SCORM', 'Scorm');
define('RESOURCE_SURVEY', 'survey');
define('RESOURCE_SURVEYQUESTION', 'survey_question');
define('RESOURCE_SURVEYINVITATION', 'survey_invitation');
define('RESOURCE_WIKI', 'wiki');
define('RESOURCE_THEMATIC', 'thematic');
define('RESOURCE_ATTENDANCE', 'attendance');
define('RESOURCE_WORK', 'work');
define('RESOURCE_SESSION_COURSE', 'session_course');
define('RESOURCE_GRADEBOOK', 'gradebook');
define('ADD_THEMATIC_PLAN', 6);

// Max online users to show per page (whoisonline)
define('MAX_ONLINE_USERS', 12);

// Number of characters maximum to show in preview of course blog posts
define('BLOG_MAX_PREVIEW_CHARS', 800);
// HTML string to replace with a 'Read more...' link
define('BLOG_PAGE_BREAK', '<div style="page-break-after: always"><span style="display: none;">&nbsp;</span></div>');

// Make sure the CHAMILO_LOAD_WYSIWYG constant is defined
// To remove CKeditor libs from HTML, set this constant to true before loading
if (!defined('CHAMILO_LOAD_WYSIWYG')) {
    define('CHAMILO_LOAD_WYSIWYG', true);
}

/* Constants for course home */
define('TOOL_PUBLIC', 'Public');
define('TOOL_PUBLIC_BUT_HIDDEN', 'PublicButHide');
define('TOOL_COURSE_ADMIN', 'courseAdmin');
define('TOOL_PLATFORM_ADMIN', 'platformAdmin');
define('TOOL_AUTHORING', 'toolauthoring');
define('TOOL_INTERACTION', 'toolinteraction');
define('TOOL_COURSE_PLUGIN', 'toolcourseplugin'); //all plugins that can be enabled in courses
define('TOOL_ADMIN', 'tooladmin');
define('TOOL_ADMIN_PLATFORM', 'tooladminplatform');
define('TOOL_DRH', 'tool_drh');
define('TOOL_STUDENT_VIEW', 'toolstudentview');
define('TOOL_ADMIN_VISIBLE', 'tooladminvisible');

/**
 * Returns a path to a certain resource within the Chamilo area, specifyed through a parameter.
 * Also, this function provides conversion between path types, in this case the input path points inside the Chamilo area too.
 *
 * See $_configuration['course_folder'] in the configuration.php to alter the WEB_COURSE_PATH and SYS_COURSE_PATH parameters.

 *
 * @param string $path (optional)   A path which type is to be converted. Also, it may be a defined constant for a path.
 *                     This parameter has meaning when $type parameter has one of the following values: TO_WEB, TO_SYS, TO_REL. Otherwise it is ignored.
 *
 * @return string the requested path or the converted path
 *
 *
 * Notes about the current behaviour model:
 * 1. Windows back-slashes are converted to slashes in the result.
 * 2. A semi-absolute web-path is detected by its leading slash. On Linux systems, absolute system paths start with
 * a slash too, so an additional check about presence of leading system server base is implemented. For example, the function is
 * able to distinguish type difference between /var/www/chamilo/courses/ (SYS) and /chamilo/courses/ (REL).
 * 3. The function api_get_path() returns only these three types of paths, which in some sense are absolute. The function has
 * no a mechanism for processing relative web/system paths, such as: lesson01.html, ./lesson01.html, ../css/my_styles.css.
 * It has not been identified as needed yet.
 * 4. Also, resolving the meta-symbols "." and ".." within paths has not been implemented, it is to be identified as needed.
 *
 * For examples go to: *
 * See main/admin/system_status.php?section=paths
 *
 * Vchamilo changes : allow using an alternate configuration
 * to get vchamilo  instance paths
 */
function api_get_path($path = '', $configuration = [])
{
    global $paths;

    // get proper configuration data if exists
    global $_configuration;

    $emptyConfigurationParam = false;
    if (empty($configuration)) {
        $configuration = (array) $_configuration;
        $emptyConfigurationParam = true;
    }

    $course_folder = 'courses/';
    $code_folder = 'main/';
    $root_sys = Container::getRootDir();
    $root_web = '';
    // If no $root_web has been set so far *and* no custom config has been passed to the function
    // then re-use the previously-calculated (run-specific) $root_web and skip this complex calculation
    if (empty($root_web) || $emptyConfigurationParam === false || empty($configuration)) {
        // Resolve master hostname.
        if (!empty($configuration) && array_key_exists('root_web', $configuration)) {
            $root_web = $configuration['root_web'];
        } else {
            $root_web = '';
            // Try guess it from server.
            if (defined('SYSTEM_INSTALLATION') && SYSTEM_INSTALLATION) {
                if (($pos = strpos(($requested_page_rel = api_get_self()), 'main/install')) !== false) {
                    $root_rel = substr($requested_page_rel, 0, $pos);
                    // See http://www.mediawiki.org/wiki/Manual:$wgServer
                    $server_protocol = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') ? 'https' : 'http';
                    $server_name =
                        isset($_SERVER['SERVER_NAME']) ? $_SERVER['SERVER_NAME']
                            : (isset($_SERVER['HOSTNAME']) ? $_SERVER['HOSTNAME']
                            : (isset($_SERVER['HTTP_HOST']) ? $_SERVER['HTTP_HOST']
                                : (isset($_SERVER['SERVER_ADDR']) ? $_SERVER['SERVER_ADDR']
                                    : 'localhost')));
                    if (isset($_SERVER['SERVER_PORT']) && !strpos($server_name, ':')
                        && (($server_protocol == 'http'
                                && $_SERVER['SERVER_PORT'] != 80) || ($server_protocol == 'https' && $_SERVER['SERVER_PORT'] != 443))
                    ) {
                        $server_name .= ":".$_SERVER['SERVER_PORT'];
                    }
                    $root_web = $server_protocol.'://'.$server_name.$root_rel;
                    $root_sys = str_replace('\\', '/', realpath(__DIR__.'/../../../')).'/';
                }
                // Here we give up, so we don't touch anything.
            }
        }
    }

    if (isset(Container::$container)) {
        $root_web = Container::$container->get('router')->generate(
            'legacy_index',
            [],
            UrlGeneratorInterface::ABSOLUTE_URL
        );

        // Fix for php files inside main
        if (strpos($root_web, 'main') !== false) {
            $pos = (int) strpos($root_web, 'main');
            $root_web = substr($root_web, 0, $pos);
        }

        // Fix for php files inside courses
        if (strpos($root_web, '/courses/') !== false) {
            $pos = (int) strpos($root_web, '/courses/');
            $root_web = substr($root_web, 0, $pos);
        }

        $root_web = urldecode($root_web);
    }

    $root_web = str_replace('public/../', '', $root_web);

    if (isset($configuration['multiple_access_urls']) &&
        $configuration['multiple_access_urls']
    ) {
        // To avoid that the api_get_access_url() function fails since global.inc.php also calls the main_api.lib.php
        if (isset($configuration['access_url']) && !empty($configuration['access_url'])) {
            // We look into the DB the function api_get_access_url
            $urlInfo = api_get_access_url($configuration['access_url']);
            // Avoid default value
            $defaultValues = ['http://localhost/', 'https://localhost/'];
            if (!empty($urlInfo['url']) && !in_array($urlInfo['url'], $defaultValues)) {
                $root_web = $urlInfo['active'] == 1 ? $urlInfo['url'] : $configuration['root_web'];
            }
        }
    }

    $paths = [];
    // Initialise cache with default values.
    if (!array_key_exists($root_web, $paths)) {
        $paths[$root_web] = [
            WEB_PATH => '',
            SYS_PATH => '',
            REL_PATH => '',
            WEB_COURSE_PATH => '',
            SYS_COURSE_PATH => '',
            REL_COURSE_PATH => '',
            WEB_CODE_PATH => 'main/',
            SYS_CODE_PATH => 'main/',
            REL_CODE_PATH => '/main/',
            SYS_LANG_PATH => 'lang/',
            WEB_IMG_PATH => 'public/img/',
            WEB_CSS_PATH => 'public/build/css/',
            SYS_CSS_PATH => 'public/build/css/',
            SYS_PLUGIN_PATH => 'plugin/',
            WEB_PLUGIN_PATH => 'plugin/',
            WEB_PLUGIN_ASSET_PATH => 'public/plugins/',
            SYS_ARCHIVE_PATH => 'var/cache/',
            WEB_ARCHIVE_PATH => 'var/cache/',
            SYS_HOME_PATH => 'app/home/',
            WEB_HOME_PATH => 'app/home/',
            REL_HOME_PATH => 'app/home/',
            SYS_APP_PATH => 'var/',
            SYS_UPLOAD_PATH => 'var/upload/',
            SYS_INC_PATH => 'inc/',
            CONFIGURATION_PATH => 'app/config/',
            LIBRARY_PATH => 'inc/lib/',
            WEB_LIBRARY_PATH => 'inc/lib/',
            WEB_LIBRARY_JS_PATH => 'inc/lib/javascript/',
            WEB_AJAX_PATH => 'inc/ajax/',
            SYS_TEST_PATH => 'tests/',
            WEB_TEMPLATE_PATH => 'template/',
            SYS_TEMPLATE_PATH => 'template/',
            WEB_UPLOAD_PATH => 'var/upload/',
            WEB_PUBLIC_PATH => 'public/',
            SYS_PUBLIC_PATH => 'public/',
            WEB_FONTS_PATH => 'fonts/',
            SYS_FONTS_PATH => 'fonts/',
        ];
    }

    $isInitialized = [];
    $root_rel = $_SERVER['APP_URL_APPEND'] ?? '';

    if (!empty($root_rel)) {
        // Adds "/" to the root_rel
        $hasSlash = substr($root_rel, 0, 1);
        if ($hasSlash !== '/') {
            $root_rel = '/'.$root_rel;
        }
    }

    // Web server base and system server base.
    if (!array_key_exists($root_web, $isInitialized)) {
        // Dealing with trailing slashes.
        $rootWebWithSlash = api_add_trailing_slash($root_web);
        $root_sys = api_add_trailing_slash($root_sys);
        $root_rel = api_add_trailing_slash($root_rel);

        // Initialization of a table that contains common-purpose paths.
        $paths[$root_web][REL_PATH] = $root_rel;
        $paths[$root_web][REL_COURSE_PATH] = $root_rel.$course_folder;
        $paths[$root_web][REL_CODE_PATH] = $root_rel.$code_folder;
        $paths[$root_web][WEB_PATH] = $rootWebWithSlash;
        $paths[$root_web][WEB_CODE_PATH] = $rootWebWithSlash.$code_folder;
        $paths[$root_web][WEB_COURSE_PATH] = $rootWebWithSlash.$course_folder;
        $paths[$root_web][WEB_PLUGIN_PATH] = $rootWebWithSlash.$paths[$root_web][WEB_PLUGIN_PATH];
        $paths[$root_web][WEB_PLUGIN_ASSET_PATH] = $rootWebWithSlash.$paths[$root_web][WEB_PLUGIN_ASSET_PATH];
        $paths[$root_web][WEB_ARCHIVE_PATH] = $rootWebWithSlash.$paths[$root_web][WEB_ARCHIVE_PATH];
        $paths[$root_web][WEB_CSS_PATH] = $rootWebWithSlash.$paths[$root_web][WEB_CSS_PATH];
        $paths[$root_web][WEB_UPLOAD_PATH] = $rootWebWithSlash.$paths[$root_web][WEB_UPLOAD_PATH];
        $paths[$root_web][WEB_PUBLIC_PATH] = $rootWebWithSlash.$paths[$root_web][WEB_PUBLIC_PATH];
        $paths[$root_web][WEB_HOME_PATH] = $rootWebWithSlash.$paths[$root_web][REL_HOME_PATH];

        $paths[$root_web][WEB_IMG_PATH] = $rootWebWithSlash.$paths[$root_web][WEB_IMG_PATH];
        $paths[$root_web][WEB_LIBRARY_PATH] = $paths[$root_web][WEB_CODE_PATH].$paths[$root_web][WEB_LIBRARY_PATH];
        $paths[$root_web][WEB_LIBRARY_JS_PATH] = $paths[$root_web][WEB_CODE_PATH].$paths[$root_web][WEB_LIBRARY_JS_PATH];
        $paths[$root_web][WEB_AJAX_PATH] = $paths[$root_web][WEB_CODE_PATH].$paths[$root_web][WEB_AJAX_PATH];
        $paths[$root_web][WEB_FONTS_PATH] = $paths[$root_web][WEB_CODE_PATH].$paths[$root_web][WEB_FONTS_PATH];
        $paths[$root_web][WEB_TEMPLATE_PATH] = $paths[$root_web][WEB_CODE_PATH].$paths[$root_web][WEB_TEMPLATE_PATH];

        $paths[$root_web][SYS_PATH] = $root_sys;
        $paths[$root_web][SYS_CODE_PATH] = $root_sys.$code_folder;
        $paths[$root_web][SYS_TEST_PATH] = $paths[$root_web][SYS_PATH].$paths[$root_web][SYS_TEST_PATH];
        $paths[$root_web][SYS_TEMPLATE_PATH] = $paths[$root_web][SYS_CODE_PATH].$paths[$root_web][SYS_TEMPLATE_PATH];
        $paths[$root_web][SYS_PUBLIC_PATH] = $paths[$root_web][SYS_PATH].$paths[$root_web][SYS_PUBLIC_PATH];
        $paths[$root_web][SYS_CSS_PATH] = $paths[$root_web][SYS_PATH].$paths[$root_web][SYS_CSS_PATH];
        $paths[$root_web][SYS_FONTS_PATH] = $paths[$root_web][SYS_CODE_PATH].$paths[$root_web][SYS_FONTS_PATH];
        $paths[$root_web][SYS_ARCHIVE_PATH] = $paths[$root_web][SYS_PATH].$paths[$root_web][SYS_ARCHIVE_PATH];
        $paths[$root_web][SYS_APP_PATH] = $paths[$root_web][SYS_PATH].$paths[$root_web][SYS_APP_PATH];
        $paths[$root_web][SYS_COURSE_PATH] = $paths[$root_web][SYS_APP_PATH].$course_folder;
        $paths[$root_web][SYS_UPLOAD_PATH] = $paths[$root_web][SYS_PATH].$paths[$root_web][SYS_UPLOAD_PATH];
        $paths[$root_web][SYS_LANG_PATH] = $paths[$root_web][SYS_CODE_PATH].$paths[$root_web][SYS_LANG_PATH];
        $paths[$root_web][SYS_HOME_PATH] = $paths[$root_web][SYS_PATH].$paths[$root_web][SYS_HOME_PATH];
        $paths[$root_web][SYS_PLUGIN_PATH] = $paths[$root_web][SYS_PATH].$paths[$root_web][SYS_PLUGIN_PATH];
        $paths[$root_web][SYS_INC_PATH] = $paths[$root_web][SYS_CODE_PATH].$paths[$root_web][SYS_INC_PATH];

        $paths[$root_web][LIBRARY_PATH] = $paths[$root_web][SYS_CODE_PATH].$paths[$root_web][LIBRARY_PATH];
        $paths[$root_web][CONFIGURATION_PATH] = $paths[$root_web][SYS_PATH].$paths[$root_web][CONFIGURATION_PATH];

        global $virtualChamilo;
        if (!empty($virtualChamilo)) {
            $paths[$root_web][SYS_ARCHIVE_PATH] = api_add_trailing_slash($virtualChamilo[SYS_ARCHIVE_PATH]);
            $paths[$root_web][SYS_HOME_PATH] = api_add_trailing_slash($virtualChamilo[SYS_HOME_PATH]);
            $paths[$root_web][SYS_COURSE_PATH] = api_add_trailing_slash($virtualChamilo[SYS_COURSE_PATH]);
            $paths[$root_web][SYS_UPLOAD_PATH] = api_add_trailing_slash($virtualChamilo[SYS_UPLOAD_PATH]);

            $paths[$root_web][WEB_HOME_PATH] = api_add_trailing_slash($virtualChamilo[WEB_HOME_PATH]);
            $paths[$root_web][WEB_UPLOAD_PATH] = api_add_trailing_slash($virtualChamilo[WEB_UPLOAD_PATH]);
            $paths[$root_web][WEB_ARCHIVE_PATH] = api_add_trailing_slash($virtualChamilo[WEB_ARCHIVE_PATH]);
            //$paths[$root_web][WEB_COURSE_PATH] = api_add_trailing_slash($virtualChamilo[WEB_COURSE_PATH]);

            // WEB_UPLOAD_PATH should be handle by apache htaccess in the vhost

            // RewriteEngine On
            // RewriteRule /app/upload/(.*)$ http://localhost/other/upload/my-chamilo111-net/$1 [QSA,L]

            //$paths[$root_web][WEB_UPLOAD_PATH] = api_add_trailing_slash($virtualChamilo[WEB_UPLOAD_PATH]);
            //$paths[$root_web][REL_PATH] = $virtualChamilo[REL_PATH];
            //$paths[$root_web][REL_COURSE_PATH] = $virtualChamilo[REL_COURSE_PATH];
        }

        $isInitialized[$root_web] = true;
    }

    $path = trim($path);

    // Retrieving a common-purpose path.
    if (isset($paths[$root_web][$path])) {
        return $paths[$root_web][$path];
    }

    // Second purification.

    // Replacing Windows back slashes.
    $path = str_replace('\\', '/', $path);
    // Query strings sometimes mighth wrongly appear in non-URLs.
    // Let us check remove them from all types of paths.
    if (($pos = strpos($path, '?')) !== false) {
        $path = substr($path, 0, $pos);
    }

    // Path now is semi-absolute. It is convenient at this moment repeated slashes to be removed.
    $path = preg_replace(REPEATED_SLASHES_PURIFIER, '/', $path);

    return $path;
}

/**
 * Adds to a given path a trailing slash if it is necessary (adds "/" character at the end of the string).
 *
 * @param string $path the input path
 *
 * @return string returns the modified path
 */
function api_add_trailing_slash($path)
{
    return substr($path, -1) == '/' ? $path : $path.'/';
}

/**
 * Removes from a given path the trailing slash if it is necessary (removes "/" character from the end of the string).
 *
 * @param string $path the input path
 *
 * @return string returns the modified path
 */
function api_remove_trailing_slash($path)
{
    return substr($path, -1) == '/' ? substr($path, 0, -1) : $path;
}

/**
 * Checks the RFC 3986 syntax of a given URL.
 *
 * @param string $url      the URL to be checked
 * @param bool   $absolute whether the URL is absolute (beginning with a scheme such as "http:")
 *
 * @return string|false Returns the URL if it is valid, FALSE otherwise.
 *                      This function is an adaptation from the function valid_url(), Drupal CMS.
 *
 * @see http://drupal.org
 * Note: The built-in function filter_var($urs, FILTER_VALIDATE_URL) has a bug for some versions of PHP.
 * @see http://bugs.php.net/51192
 */
function api_valid_url($url, $absolute = false)
{
    if ($absolute) {
        if (preg_match("
            /^                                                      # Start at the beginning of the text
            (?:ftp|https?|feed):\/\/                                # Look for ftp, http, https or feed schemes
            (?:                                                     # Userinfo (optional) which is typically
                (?:(?:[\w\.\-\+!$&'\(\)*\+,;=]|%[0-9a-f]{2})+:)*    # a username or a username and password
                (?:[\w\.\-\+%!$&'\(\)*\+,;=]|%[0-9a-f]{2})+@        # combination
            )?
            (?:
                (?:[a-z0-9\-\.]|%[0-9a-f]{2})+                      # A domain name or a IPv4 address
                |(?:\[(?:[0-9a-f]{0,4}:)*(?:[0-9a-f]{0,4})\])       # or a well formed IPv6 address
            )
            (?::[0-9]+)?                                            # Server port number (optional)
            (?:[\/|\?]
                (?:[\w#!:\.\?\+=&@$'~*,;\/\(\)\[\]\-]|%[0-9a-f]{2}) # The path and query (optional)
            *)?
            $/xi", $url)) {
            return $url;
        }

        return false;
    } else {
        return preg_match("/^(?:[\w#!:\.\?\+=&@$'~*,;\/\(\)\[\]\-]|%[0-9a-f]{2})+$/i", $url) ? $url : false;
    }
}

/**
 * Checks whether a given string looks roughly like an email address.
 *
 * @param string $address the e-mail address to be checked
 *
 * @return mixed returns the e-mail if it is valid, FALSE otherwise
 */
function api_valid_email($address)
{
    return filter_var($address, FILTER_VALIDATE_EMAIL);
}

/* PROTECTION FUNCTIONS
   Use these functions to protect your scripts. */

/**
 * Function used to protect a course script.
 * The function blocks access when
 * - there is no $_SESSION["_course"] defined; or
 * - $is_allowed_in_course is set to false (this depends on the course
 * visibility and user status).
 *
 * This is only the first proposal, test and improve!
 *
 * @param bool Option to print headers when displaying error message. Default: false
 * @param bool whether session admins should be allowed or not
 * @param bool $checkTool check if tool is available for users (user, group)
 *
 * @return bool True if the user has access to the current course or is out of a course context, false otherwise
 *
 * @todo replace global variable
 *
 * @author Roan Embrechts
 */
function api_protect_course_script($print_headers = false, $allow_session_admins = false, $checkTool = '')
{
    $course_info = api_get_course_info();
    if (empty($course_info)) {
        api_not_allowed($print_headers);

        return false;
    }

    if (api_is_drh()) {
        return true;
    }

    // Session admin has access to course
    $sessionAccess = api_get_configuration_value('session_admins_access_all_content');
    if ($sessionAccess) {
        $allow_session_admins = true;
    }

    if (api_is_platform_admin($allow_session_admins)) {
        return true;
    }

    $isAllowedInCourse = api_is_allowed_in_course();
    $is_visible = false;
    if (isset($course_info) && isset($course_info['visibility'])) {
        switch ($course_info['visibility']) {
            default:
            case COURSE_VISIBILITY_CLOSED:
                // Completely closed: the course is only accessible to the teachers. - 0
                if (api_get_user_id() && !api_is_anonymous() && $isAllowedInCourse) {
                    $is_visible = true;
                }
                break;
            case COURSE_VISIBILITY_REGISTERED:
                // Private - access authorized to course members only - 1
                if (api_get_user_id() && !api_is_anonymous() && $isAllowedInCourse) {
                    $is_visible = true;
                }
                break;
            case COURSE_VISIBILITY_OPEN_PLATFORM:
                // Open - access allowed for users registered on the platform - 2
                if (api_get_user_id() && !api_is_anonymous() && $isAllowedInCourse) {
                    $is_visible = true;
                }
                break;
            case COURSE_VISIBILITY_OPEN_WORLD:
                //Open - access allowed for the whole world - 3
                $is_visible = true;
                break;
            case COURSE_VISIBILITY_HIDDEN:
                //Completely closed: the course is only accessible to the teachers. - 0
                if (api_is_platform_admin()) {
                    $is_visible = true;
                }
                break;
        }

        //If password is set and user is not registered to the course then the course is not visible
        if ($isAllowedInCourse == false &&
            isset($course_info['registration_code']) &&
            !empty($course_info['registration_code'])
        ) {
            $is_visible = false;
        }
    }

    if (!empty($checkTool)) {
        if (!api_is_allowed_to_edit(true, true, true)) {
            $toolInfo = api_get_tool_information_by_name($checkTool);
            if (!empty($toolInfo) && isset($toolInfo['visibility']) && $toolInfo['visibility'] == 0) {
                api_not_allowed(true);

                return false;
            }
        }
    }

    // Check session visibility
    $session_id = api_get_session_id();

    if (!empty($session_id)) {
        // $isAllowedInCourse was set in local.inc.php
        if (!$isAllowedInCourse) {
            $is_visible = false;
        }
    }

    if (!$is_visible) {
        api_not_allowed($print_headers);

        return false;
    }

    return true;
}

/**
 * Function used to protect an admin script.
 *
 * The function blocks access when the user has no platform admin rights
 * with an error message printed on default output
 *
 * @param bool Whether to allow session admins as well
 * @param bool Whether to allow HR directors as well
 * @param string An optional message (already passed through get_lang)
 *
 * @return bool True if user is allowed, false otherwise.
 *              The function also outputs an error message in case not allowed
 *
 * @author Roan Embrechts (original author)
 */
function api_protect_admin_script($allow_sessions_admins = false, $allow_drh = false, $message = null)
{
    if (!api_is_platform_admin($allow_sessions_admins, $allow_drh)) {
        api_not_allowed(true, $message);

        return false;
    }

    return true;
}

/**
 * Function used to protect a teacher script.
 * The function blocks access when the user has no teacher rights.
 *
 * @return bool True if the current user can access the script, false otherwise
 *
 * @author Yoselyn Castillo
 */
function api_protect_teacher_script()
{
    if (!api_is_allowed_to_edit()) {
        api_not_allowed(true);

        return false;
    }

    return true;
}

/**
 * Function used to prevent anonymous users from accessing a script.
 *
 * @param bool|true $printHeaders
 *
 * @author Roan Embrechts
 *
 * @return bool
 */
function api_block_anonymous_users($printHeaders = true)
{
    $user = api_get_user_info();
    if (!(isset($user['user_id']) && $user['user_id']) || api_is_anonymous($user['user_id'], true)) {
        api_not_allowed($printHeaders);

        return false;
    }

    return true;
}

/**
 * Returns a rough evaluation of the browser's name and version based on very
 * simple regexp.
 *
 * @return array with the navigator name and version ['name' => '...', 'version' => '...']
 */
function api_get_navigator()
{
    $navigator = 'Unknown';
    $version = 0;

    if (!isset($_SERVER['HTTP_USER_AGENT'])) {
        return ['name' => 'Unknown', 'version' => '0.0.0'];
    }

    if (strpos($_SERVER['HTTP_USER_AGENT'], 'Opera') !== false) {
        $navigator = 'Opera';
        list(, $version) = explode('Opera', $_SERVER['HTTP_USER_AGENT']);
    } elseif (strpos($_SERVER['HTTP_USER_AGENT'], 'Edge') !== false) {
        $navigator = 'Edge';
        list(, $version) = explode('Edge', $_SERVER['HTTP_USER_AGENT']);
    } elseif (strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== false) {
        $navigator = 'Internet Explorer';
        list(, $version) = explode('MSIE ', $_SERVER['HTTP_USER_AGENT']);
    } elseif (strpos($_SERVER['HTTP_USER_AGENT'], 'Chrome') !== false) {
        $navigator = 'Chrome';
        list(, $version) = explode('Chrome', $_SERVER['HTTP_USER_AGENT']);
    } elseif (stripos($_SERVER['HTTP_USER_AGENT'], 'Safari') !== false) {
        $navigator = 'Safari';
        if (stripos($_SERVER['HTTP_USER_AGENT'], 'Version/') !== false) {
            // If this Safari does have the "Version/" string in its user agent
            // then use that as a version indicator rather than what's after
            // "Safari/" which is rather a "build number" or something
            list(, $version) = explode('Version/', $_SERVER['HTTP_USER_AGENT']);
        } else {
            list(, $version) = explode('Safari/', $_SERVER['HTTP_USER_AGENT']);
        }
    } elseif (strpos($_SERVER['HTTP_USER_AGENT'], 'Firefox') !== false) {
        $navigator = 'Firefox';
        list(, $version) = explode('Firefox', $_SERVER['HTTP_USER_AGENT']);
    } elseif (strpos($_SERVER['HTTP_USER_AGENT'], 'Netscape') !== false) {
        $navigator = 'Netscape';
        if (stripos($_SERVER['HTTP_USER_AGENT'], 'Netscape/') !== false) {
            list(, $version) = explode('Netscape', $_SERVER['HTTP_USER_AGENT']);
        } else {
            list(, $version) = explode('Navigator', $_SERVER['HTTP_USER_AGENT']);
        }
    } elseif (strpos($_SERVER['HTTP_USER_AGENT'], 'Konqueror') !== false) {
        $navigator = 'Konqueror';
        list(, $version) = explode('Konqueror', $_SERVER['HTTP_USER_AGENT']);
    } elseif (stripos($_SERVER['HTTP_USER_AGENT'], 'applewebkit') !== false) {
        $navigator = 'AppleWebKit';
        list(, $version) = explode('Version/', $_SERVER['HTTP_USER_AGENT']);
    } elseif (strpos($_SERVER['HTTP_USER_AGENT'], 'Gecko') !== false) {
        $navigator = 'Mozilla';
        list(, $version) = explode('; rv:', $_SERVER['HTTP_USER_AGENT']);
    }

    // Now cut extra stuff around (mostly *after*) the version number
    $version = preg_replace('/^([\/\s])?([\d\.]+)?.*/', '\2', $version);

    if (strpos($version, '.') === false) {
        $version = number_format(doubleval($version), 1);
    }
    $return = ['name' => $navigator, 'version' => $version];

    return $return;
}

/**
 * @return true if user self registration is allowed, false otherwise
 */
function api_is_self_registration_allowed()
{
    return isset($GLOBALS['allowSelfReg']) ? $GLOBALS['allowSelfReg'] : false;
}

/**
 * This function returns the id of the user which is stored in the $_user array.
 *
 * example: The function can be used to check if a user is logged in
 *          if (api_get_user_id())
 *
 * @return int the id of the current user, 0 if is empty
 */
function api_get_user_id()
{
    $userInfo = Session::read('_user');
    if ($userInfo && isset($userInfo['user_id'])) {
        return (int) $userInfo['user_id'];
    }

    return 0;
}

/**
 * Gets the list of courses a specific user is subscribed to.
 *
 * @param int       User ID
 * @param bool $fetch_session Whether to get session courses or not - NOT YET IMPLEMENTED
 *
 * @return array Array of courses in the form [0]=>('code'=>xxx,'db'=>xxx,'dir'=>xxx,'status'=>d)
 *
 * @deprecated use CourseManager::get_courses_list_by_user_id()
 */
function api_get_user_courses($userId, $fetch_session = true)
{
    // Get out if not integer
    if ($userId != strval(intval($userId))) {
        return [];
    }

    $t_course = Database::get_main_table(TABLE_MAIN_COURSE);
    $t_course_user = Database::get_main_table(TABLE_MAIN_COURSE_USER);

    $sql = "SELECT cc.id as real_id, cc.code code, cc.directory dir, cu.status status
            FROM $t_course cc, $t_course_user cu
            WHERE
                cc.id = cu.c_id AND
                cu.user_id = $userId AND
                cu.relation_type <> ".COURSE_RELATION_TYPE_RRHH;
    $result = Database::query($sql);
    if ($result === false) {
        return [];
    }

    $courses = [];
    while ($row = Database::fetch_array($result)) {
        // we only need the database name of the course
        $courses[] = $row;
    }

    return $courses;
}

/**
 * Formats user information into a standard array
 * This function should be only used inside api_get_user_info().
 *
 * @param array Non-standard user array
 * @param bool $add_password
 * @param bool $loadAvatars  turn off to improve performance
 *
 * @return array Standard user array
 */
function _api_format_user($user, $add_password = false, $loadAvatars = true)
{
    $result = [];

    if (!isset($user['user_id'])) {
        return [];
    }

    $result['firstname'] = null;
    $result['lastname'] = null;

    if (isset($user['firstname']) && isset($user['lastname'])) {
        // with only lowercase
        $result['firstname'] = $user['firstname'];
        $result['lastname'] = $user['lastname'];
    } elseif (isset($user['firstName']) && isset($user['lastName'])) {
        // with uppercase letters
        $result['firstname'] = isset($user['firstName']) ? $user['firstName'] : null;
        $result['lastname'] = isset($user['lastName']) ? $user['lastName'] : null;
    }

    if (isset($user['email'])) {
        $result['mail'] = isset($user['email']) ? $user['email'] : null;
        $result['email'] = isset($user['email']) ? $user['email'] : null;
    } else {
        $result['mail'] = isset($user['mail']) ? $user['mail'] : null;
        $result['email'] = isset($user['mail']) ? $user['mail'] : null;
    }

    $result['complete_name'] = api_get_person_name($result['firstname'], $result['lastname']);
    $result['complete_name_with_username'] = $result['complete_name'];

    if (!empty($user['username']) && api_get_setting('profile.hide_username_with_complete_name') === 'false') {
        $result['complete_name_with_username'] = $result['complete_name'].' ('.$user['username'].')';
    }

    $showEmail = api_get_setting('show_email_addresses') === 'true';
    if (!empty($user['email'])) {
        $result['complete_name_with_email_forced'] = $result['complete_name'].' ('.$user['email'].')';
        if ($showEmail) {
            $result['complete_name_with_email'] = $result['complete_name'].' ('.$user['email'].')';
        }
    } else {
        $result['complete_name_with_email'] = $result['complete_name'];
        $result['complete_name_with_email_forced'] = $result['complete_name'];
    }

    // Kept for historical reasons
    $result['firstName'] = $result['firstname'];
    $result['lastName'] = $result['lastname'];

    $attributes = [
        'phone',
        'address',
        'picture_uri',
        'official_code',
        'status',
        'active',
        'auth_source',
        'username',
        'theme',
        'language',
        'creator_id',
        'registration_date',
        'hr_dept_id',
        'expiration_date',
        'last_login',
        'user_is_online',
    ];

    if (api_get_setting('extended_profile') === 'true') {
        $attributes[] = 'competences';
        $attributes[] = 'diplomas';
        $attributes[] = 'teach';
        $attributes[] = 'openarea';
    }

    foreach ($attributes as $attribute) {
        $result[$attribute] = isset($user[$attribute]) ? $user[$attribute] : null;
    }

    $user_id = (int) $user['user_id'];
    // Maintain the user_id index for backwards compatibility
    $result['user_id'] = $result['id'] = $user_id;

    $hasCertificates = Certificate::getCertificateByUser($user_id);
    $result['has_certificates'] = 0;
    if (!empty($hasCertificates)) {
        $result['has_certificates'] = 1;
    }

    $result['icon_status'] = '';
    $result['icon_status_medium'] = '';

    $result['is_admin'] = UserManager::is_admin($user_id);

    // Getting user avatar.
    if ($loadAvatars) {
        $result['avatar'] = '';
        $result['avatar_no_query'] = '';
        $result['avatar_small'] = '';
        $result['avatar_medium'] = '';

        if (!isset($user['avatar'])) {
            $originalFile = UserManager::getUserPicture(
                $user_id,
                USER_IMAGE_SIZE_ORIGINAL,
                null,
                $result
            );
            $result['avatar'] = $originalFile;
            $avatarString = explode('?', $result['avatar']);
            $result['avatar_no_query'] = reset($avatarString);
        } else {
            $result['avatar'] = $user['avatar'];
            $avatarString = explode('?', $user['avatar']);
            $result['avatar_no_query'] = reset($avatarString);
        }

        if (!isset($user['avatar_small'])) {
            $smallFile = UserManager::getUserPicture(
                $user_id,
                USER_IMAGE_SIZE_SMALL,
                null,
                $result
            );
            $result['avatar_small'] = $smallFile;
        } else {
            $result['avatar_small'] = $user['avatar_small'];
        }

        if (!isset($user['avatar_medium'])) {
            $mediumFile = UserManager::getUserPicture(
                $user_id,
                USER_IMAGE_SIZE_MEDIUM,
                null,
                $result
            );
            $result['avatar_medium'] = $mediumFile;
        } else {
            $result['avatar_medium'] = $user['avatar_medium'];
        }

        $urlImg = api_get_path(WEB_IMG_PATH);
        $iconStatus = '';
        $iconStatusMedium = '';

        switch ($result['status']) {
            case STUDENT:
                if ($result['has_certificates']) {
                    $iconStatus = $urlImg.'icons/svg/identifier_graduated.svg';
                } else {
                    $iconStatus = $urlImg.'icons/svg/identifier_student.svg';
                }
                break;
            case COURSEMANAGER:
                if ($result['is_admin']) {
                    $iconStatus = $urlImg.'icons/svg/identifier_admin.svg';
                } else {
                    $iconStatus = $urlImg.'icons/svg/identifier_teacher.svg';
                }
                break;
            case STUDENT_BOSS:
                $iconStatus = $urlImg.'icons/svg/identifier_teacher.svg';
                break;
        }

        if (!empty($iconStatus)) {
            $iconStatusMedium = '<img src="'.$iconStatus.'" width="32px" height="32px">';
            $iconStatus = '<img src="'.$iconStatus.'" width="22px" height="22px">';
        }

        $result['icon_status'] = $iconStatus;
        $result['icon_status_medium'] = $iconStatusMedium;
    }

    if (isset($user['user_is_online'])) {
        $result['user_is_online'] = $user['user_is_online'] == true ? 1 : 0;
    }
    if (isset($user['user_is_online_in_chat'])) {
        $result['user_is_online_in_chat'] = (int) $user['user_is_online_in_chat'];
    }

    if ($add_password) {
        $result['password'] = $user['password'];
    }

    if (isset($result['profile_completed'])) {
        $result['profile_completed'] = $user['profile_completed'];
    }

    $result['profile_url'] = api_get_path(WEB_CODE_PATH).'social/profile.php?u='.$user_id;

    // Send message link
    $sendMessage = api_get_path(WEB_AJAX_PATH).'user_manager.ajax.php?a=get_user_popup&user_id='.$user_id;
    $result['complete_name_with_message_link'] = Display::url(
        $result['complete_name_with_username'],
        $sendMessage,
        ['class' => 'ajax']
    );

    if (isset($user['extra'])) {
        $result['extra'] = $user['extra'];
    }

    return $result;
}

/**
 * Finds all the information about a user.
 * If no parameter is passed you find all the information about the current user.
 *
 * @param int  $user_id
 * @param bool $checkIfUserOnline
 * @param bool $showPassword
 * @param bool $loadExtraData
 * @param bool $loadOnlyVisibleExtraData Get the user extra fields that are visible
 * @param bool $loadAvatars              turn off to improve performance and if avatars are not needed
 * @param bool $updateCache              update apc cache if exists
 *
 * @return mixed $user_info user_id, lastname, firstname, username, email, etc or false on error
 *
 * @author Patrick Cool <patrick.cool@UGent.be>
 * @author Julio Montoya
 *
 * @version 21 September 2004
 */
function api_get_user_info(
    $user_id = 0,
    $checkIfUserOnline = false,
    $showPassword = false,
    $loadExtraData = false,
    $loadOnlyVisibleExtraData = false,
    $loadAvatars = true,
    $updateCache = false
) {
    $apcVar = null;
    $user = false;
    $cacheAvailable = api_get_configuration_value('apc');

    if (empty($user_id)) {
        $userFromSession = Session::read('_user');

        if (isset($userFromSession)) {
            if ($cacheAvailable === true &&
                (
                    empty($userFromSession['is_anonymous']) &&
                    (isset($userFromSession['status']) && $userFromSession['status'] != ANONYMOUS)
                )
            ) {
                $apcVar = api_get_configuration_value('apc_prefix').'userinfo_'.$userFromSession['user_id'];
                if (apcu_exists($apcVar)) {
                    if ($updateCache) {
                        apcu_store($apcVar, $userFromSession, 60);
                    }
                    $user = apcu_fetch($apcVar);
                } else {
                    $user = _api_format_user(
                        $userFromSession,
                        $showPassword,
                        $loadAvatars
                    );
                    apcu_store($apcVar, $user, 60);
                }
            } else {
                $user = _api_format_user(
                    $userFromSession,
                    $showPassword,
                    $loadAvatars
                );
            }

            return $user;
        }

        return false;
    }

    // Make sure user_id is safe
    $user_id = (int) $user_id;

    // Re-use user information if not stale and already stored in APCu
    if ($cacheAvailable === true) {
        $apcVar = api_get_configuration_value('apc_prefix').'userinfo_'.$user_id;
        if (apcu_exists($apcVar) && $updateCache == false && $checkIfUserOnline == false) {
            $user = apcu_fetch($apcVar);

            return $user;
        }
    }

    $sql = "SELECT * FROM ".Database::get_main_table(TABLE_MAIN_USER)."
            WHERE id = $user_id";
    $result = Database::query($sql);
    if (Database::num_rows($result) > 0) {
        $result_array = Database::fetch_array($result);
        $result_array['user_is_online_in_chat'] = 0;
        if ($checkIfUserOnline) {
            $use_status_in_platform = user_is_online($user_id);
            $result_array['user_is_online'] = $use_status_in_platform;
            $user_online_in_chat = 0;
            if ($use_status_in_platform) {
                $user_status = UserManager::get_extra_user_data_by_field(
                    $user_id,
                    'user_chat_status',
                    false,
                    true
                );
                if ((int) $user_status['user_chat_status'] == 1) {
                    $user_online_in_chat = 1;
                }
            }
            $result_array['user_is_online_in_chat'] = $user_online_in_chat;
        }

        if ($loadExtraData) {
            $fieldValue = new ExtraFieldValue('user');
            $result_array['extra'] = $fieldValue->getAllValuesForAnItem(
                $user_id,
                $loadOnlyVisibleExtraData
            );
        }
        $user = _api_format_user($result_array, $showPassword, $loadAvatars);
    }

    if ($cacheAvailable === true) {
        apcu_store($apcVar, $user, 60);
    }

    return $user;
}

/**
 * @param int $userId
 *
 * @return User
 */
function api_get_user_entity($userId)
{
    $userId = (int) $userId;
    $repo = UserManager::getRepository();

    /** @var User $user */
    $user = $repo->find($userId);

    return $user;
}

/**
 * @return User|null
 */
function api_get_current_user()
{
    $isLoggedIn = Container::$container->get('security.authorization_checker')->isGranted('IS_AUTHENTICATED_REMEMBERED');
    if ($isLoggedIn === false) {
        return null;
    }

    $token = Container::$container->get('security.token_storage')->getToken();

    if (null !== $token) {
        return $token->getUser();
    }

    return null;
}

/**
 * Finds all the information about a user from username instead of user id.
 *
 * @param string $username
 *
 * @return mixed $user_info array user_id, lastname, firstname, username, email or false on error
 *
 * @author Yannick Warnier <yannick.warnier@beeznest.com>
 */
function api_get_user_info_from_username($username = '')
{
    if (empty($username)) {
        return false;
    }
    $username = trim($username);

    $sql = "SELECT * FROM ".Database::get_main_table(TABLE_MAIN_USER)."
            WHERE username='".Database::escape_string($username)."'";
    $result = Database::query($sql);
    if (Database::num_rows($result) > 0) {
        $resultArray = Database::fetch_array($result);

        return _api_format_user($resultArray);
    }

    return false;
}

/**
 * Get first user with an email.
 *
 * @param string $email
 *
 * @return array|bool
 */
function api_get_user_info_from_email($email = '')
{
    if (empty($email)) {
        return false;
    }
    $sql = "SELECT * FROM ".Database::get_main_table(TABLE_MAIN_USER)."
            WHERE email ='".Database::escape_string($email)."' LIMIT 1";
    $result = Database::query($sql);
    if (Database::num_rows($result) > 0) {
        $resultArray = Database::fetch_array($result);

        return _api_format_user($resultArray);
    }

    return false;
}

/**
 * @return string
 */
function api_get_course_id()
{
    return Session::read('_cid', null);
}

/**
 * Returns the current course id (integer).
 *
 * @param string $code Optional course code
 *
 * @return int
 */
function api_get_course_int_id($code = null)
{
    if (!empty($code)) {
        $code = Database::escape_string($code);
        $row = Database::select(
            'id',
            Database::get_main_table(TABLE_MAIN_COURSE),
            ['where' => ['code = ?' => [$code]]],
            'first'
        );

        if (is_array($row) && isset($row['id'])) {
            return $row['id'];
        } else {
            return false;
        }
    }

    return Session::read('_real_cid', 0);
}

/**
 * Returns the current course directory.
 *
 * This function relies on api_get_course_info()
 *
 * @param string    The course code - optional (takes it from session if not given)
 *
 * @return string The directory where the course is located inside the Chamilo "courses" directory
 *
 * @author Yannick Warnier <yannick.warnier@beeznest.com>
 */
function api_get_course_path($course_code = null)
{
    $info = !empty($course_code) ? api_get_course_info($course_code) : api_get_course_info();

    return $info['path'];
}

/**
 * Gets a course setting from the current course_setting table. Try always using integer values.
 *
 * @param string $settingName The name of the setting we want from the table
 * @param array  $courseInfo
 * @param bool   $force       force checking the value in the database
 *
 * @return mixed The value of that setting in that table. Return -1 if not found.
 */
function api_get_course_setting($settingName, $courseInfo = [], $force = false)
{
    if (empty($courseInfo)) {
        $courseInfo = api_get_course_info();
    }

    if (empty($courseInfo) || empty($settingName)) {
        return -1;
    }

    $courseId = isset($courseInfo['real_id']) && !empty($courseInfo['real_id']) ? $courseInfo['real_id'] : 0;

    if (empty($courseId)) {
        return -1;
    }

    static $courseSettingInfo = [];

    if ($force) {
        $courseSettingInfo = [];
    }

    if (!isset($courseSettingInfo[$courseId])) {
        $table = Database::get_course_table(TABLE_COURSE_SETTING);
        $settingName = Database::escape_string($settingName);

        $sql = "SELECT variable, value FROM $table
                WHERE c_id = $courseId ";
        $res = Database::query($sql);
        if (Database::num_rows($res) > 0) {
            $result = Database::store_result($res, 'ASSOC');
            $courseSettingInfo[$courseId] = array_column($result, 'value', 'variable');

            if (isset($courseSettingInfo[$courseId]['email_alert_manager_on_new_quiz'])) {
                $value = $courseSettingInfo[$courseId]['email_alert_manager_on_new_quiz'];
                if (!is_null($value)) {
                    $result = explode(',', $value);
                    $courseSettingInfo[$courseId]['email_alert_manager_on_new_quiz'] = $result;
                }
            }
        }
    }

    if (isset($courseSettingInfo[$courseId]) && isset($courseSettingInfo[$courseId][$settingName])) {
        return $courseSettingInfo[$courseId][$settingName];
    }

    return -1;
}

/**
 * Gets an anonymous user ID.
 *
 * For some tools that need tracking, like the learnpath tool, it is necessary
 * to have a usable user-id to enable some kind of tracking, even if not
 * perfect. An anonymous ID is taken from the users table by looking for a
 * status of "6" (anonymous).
 *
 * @return int User ID of the anonymous user, or O if no anonymous user found
 */
function api_get_anonymous_id()
{
    // Find if another anon is connected now
    $table = Database::get_main_table(TABLE_STATISTIC_TRACK_E_LOGIN);
    $tableU = Database::get_main_table(TABLE_MAIN_USER);
    $ip = Database::escape_string(api_get_real_ip());
    $max = (int) api_get_configuration_value('max_anonymous_users');
    if ($max >= 2) {
        $sql = "SELECT * FROM $table as TEL 
                JOIN $tableU as U
                ON U.user_id = TEL.login_user_id
                WHERE TEL.user_ip = '$ip'
                    AND U.status = ".ANONYMOUS."
                    AND U.user_id != 2 ";

        $result = Database::query($sql);
        if (empty(Database::num_rows($result))) {
            $login = uniqid('anon_');
            $anonList = UserManager::get_user_list(['status' => ANONYMOUS], ['registration_date ASC']);
            if (count($anonList) >= $max) {
                foreach ($anonList as $userToDelete) {
                    UserManager::delete_user($userToDelete['user_id']);
                    break;
                }
            }
            $userId = UserManager::create_user(
                $login,
                'anon',
                ANONYMOUS,
                ' anonymous@localhost',
                $login,
                $login
            );

            return $userId;
        } else {
            $row = Database::fetch_array($result, 'ASSOC');

            return $row['user_id'];
        }
    }

    $table = Database::get_main_table(TABLE_MAIN_USER);
    $sql = "SELECT user_id 
            FROM $table 
            WHERE status = ".ANONYMOUS." ";
    $res = Database::query($sql);
    if (Database::num_rows($res) > 0) {
        $row = Database::fetch_array($res, 'ASSOC');

        return $row['user_id'];
    }

    // No anonymous user was found.
    return 0;
}

/**
 * @param string $courseCode
 * @param int    $sessionId
 * @param int    $groupId
 *
 * @return string
 */
function api_get_cidreq_params($courseCode, $sessionId = 0, $groupId = 0)
{
    $courseCode = !empty($courseCode) ? htmlspecialchars($courseCode) : '';
    $sessionId = !empty($sessionId) ? (int) $sessionId : 0;
    $groupId = !empty($groupId) ? (int) $groupId : 0;

    $url = 'cidReq='.$courseCode;
    $url .= '&id_session='.$sessionId;
    $url .= '&gidReq='.$groupId;

    return $url;
}

/**
 * Returns the current course url part including session, group, and gradebook params.
 *
 * @param bool   $addSessionId
 * @param bool   $addGroupId
 * @param string $origin
 *
 * @return string Course & session references to add to a URL
 */
function api_get_cidreq($addSessionId = true, $addGroupId = true, $origin = '')
{
    $courseCode = api_get_course_id();
    $url = empty($courseCode) ? '' : 'cidReq='.htmlspecialchars($courseCode);
    $origin = empty($origin) ? api_get_origin() : Security::remove_XSS($origin);

    if ($addSessionId) {
        if (!empty($url)) {
            $url .= api_get_session_id() == 0 ? '&id_session=0' : '&id_session='.api_get_session_id();
        }
    }

    if ($addGroupId) {
        if (!empty($url)) {
            $url .= api_get_group_id() == 0 ? '&gidReq=0' : '&gidReq='.api_get_group_id();
        }
    }

    if (!empty($url)) {
        $url .= '&gradebook='.(int) api_is_in_gradebook();
        $url .= '&origin='.$origin;
    }

    return $url;
}

/**
 * Get if we visited a gradebook page.
 *
 * @return bool
 */
function api_is_in_gradebook()
{
    return Session::read('in_gradebook', false);
}

/**
 * Set that we are in a page inside a gradebook.
 */
function api_set_in_gradebook()
{
    Session::write('in_gradebook', true);
}

/**
 * Remove gradebook session.
 */
function api_remove_in_gradebook()
{
    Session::erase('in_gradebook');
}

/**
 * Returns the current course info array see api_format_course_array()
 * If the course_code is given, the returned array gives info about that
 * particular course, if none given it gets the course info from the session.
 *
 * @param string $course_code
 *
 * @return array
 */
function api_get_course_info($course_code = null)
{
    if (!empty($course_code)) {
        $course_code = Database::escape_string($course_code);
        $courseId = api_get_course_int_id($course_code);

        if (empty($courseId)) {
            return [];
        }

        $course_table = Database::get_main_table(TABLE_MAIN_COURSE);
        $course_cat_table = Database::get_main_table(TABLE_MAIN_CATEGORY);
        $sql = "SELECT
                    course.*,
                    course_category.code faCode,
                    course_category.name faName
                FROM $course_table
                LEFT JOIN $course_cat_table
                ON course.category_code = course_category.code
                WHERE course.id = $courseId";
        $result = Database::query($sql);
        $courseInfo = [];
        if (Database::num_rows($result) > 0) {
            $data = Database::fetch_array($result);
            $courseInfo = api_format_course_array($data);
        }

        return $courseInfo;
    }

    $_course = Session::read('_course');
    if ($_course == '-1') {
        $_course = [];
    }

    return $_course;
}

/**
 * @param int $courseId
 *
 * @return Course
 */
function api_get_course_entity($courseId = 0)
{
    if (empty($courseId)) {
        $courseId = api_get_course_int_id();
    }

    return CourseManager::getManager()->find($courseId);
}

/**
 * @param int $id
 *
 * @return SessionEntity
 */
function api_get_session_entity($id = 0)
{
    if (empty($id)) {
        $id = api_get_session_id();
    }

    return Database::getManager()->getRepository('ChamiloCoreBundle:Session')->find($id);
}

/**
 * @param int $id
 *
 * @return CGroupInfo
 */
function api_get_group_entity($id = 0)
{
    if (empty($id)) {
        $id = api_get_group_id();
    }

    return Database::getManager()->getRepository('ChamiloCourseBundle:CGroupInfo')->find($id);
}

/**
 * @param int $id
 *
 * @return AccessUrl
 */
function api_get_url_entity($id = 0)
{
    if (empty($id)) {
        $id = api_get_current_access_url_id();
    }

    return Container::getAccessUrlRepository()->find($id);
}

/**
 * Returns the current course info array.

 * Now if the course_code is given, the returned array gives info about that
 * particular course, not specially the current one.
 *
 * @param int $id Numeric ID of the course
 *
 * @return array The course info as an array formatted by api_format_course_array, including category.name
 */
function api_get_course_info_by_id($id = 0)
{
    $id = (int) $id;
    if (empty($id)) {
        $course = Session::read('_course', []);

        return $course;
    }

    $course_table = Database::get_main_table(TABLE_MAIN_COURSE);
    $course_cat_table = Database::get_main_table(TABLE_MAIN_CATEGORY);
    $sql = "SELECT
                course.*,
                course_category.code faCode,
                course_category.name faName,
                course_category.id faId
            FROM $course_table
            LEFT JOIN $course_cat_table
            ON course.category_code = course_category.code
            WHERE course.id = $id";
    $result = Database::query($sql);

    if (Database::num_rows($result) > 0) {
        $row = Database::fetch_array($result);
        $course = api_format_course_array($row);

        return $course;
    }

    return [];
}

/**
 * Reformat the course array (output by api_get_course_info()) in order, mostly,
 * to switch from 'code' to 'id' in the array. This is a legacy feature and is
 * now possibly causing massive confusion as a new "id" field has been added to
 * the course table in 1.9.0.
 *
 * @param $course_data
 *
 * @return array
 *
 * @todo eradicate the false "id"=code field of the $_course array and use the int id
 */
function api_format_course_array($course_data)
{
    if (empty($course_data)) {
        return [];
    }

    $_course = [];
    $_course['id'] = $course_data['code'];
    $_course['real_id'] = $course_data['id'];

    // Added
    $_course['code'] = $course_data['code'];
    $_course['name'] = $course_data['title'];
    $_course['title'] = $course_data['title'];
    $_course['official_code'] = $course_data['visual_code'];
    $_course['visual_code'] = $course_data['visual_code'];
    $_course['sysCode'] = $course_data['code'];
    $_course['path'] = $course_data['directory']; // Use as key in path.
    $_course['directory'] = $course_data['directory'];
    $_course['creation_date'] = $course_data['creation_date'];
    $_course['titular'] = $course_data['tutor_name'];
    $_course['language'] = $course_data['course_language'];
    $_course['extLink']['url'] = $course_data['department_url'];
    $_course['extLink']['name'] = $course_data['department_name'];
    $_course['categoryCode'] = $course_data['faCode'];
    $_course['categoryName'] = $course_data['faName'];
    $_course['visibility'] = $course_data['visibility'];
    $_course['subscribe_allowed'] = $course_data['subscribe'];
    $_course['subscribe'] = $course_data['subscribe'];
    $_course['unsubscribe'] = $course_data['unsubscribe'];
    $_course['course_language'] = $course_data['course_language'];
    $_course['activate_legal'] = isset($course_data['activate_legal']) ? $course_data['activate_legal'] : false;
    $_course['legal'] = $course_data['legal'];
    $_course['show_score'] = $course_data['show_score']; //used in the work tool
    $_course['department_name'] = $course_data['department_name'];
    $_course['department_url'] = $course_data['department_url'];

    $courseSys = api_get_path(SYS_COURSE_PATH).$course_data['directory'];
    $webCourseHome = api_get_path(WEB_COURSE_PATH).$course_data['directory'];

    // Course password
    $_course['registration_code'] = !empty($course_data['registration_code']) ? sha1($course_data['registration_code']) : null;
    $_course['disk_quota'] = $course_data['disk_quota'];
    $_course['course_public_url'] = $webCourseHome.'/index.php';
    $_course['course_sys_path'] = $courseSys.'/';

    if (array_key_exists('add_teachers_to_sessions_courses', $course_data)) {
        $_course['add_teachers_to_sessions_courses'] = $course_data['add_teachers_to_sessions_courses'];
    }

    // Course image
    $_course['course_image_source'] = '';
    if (file_exists($courseSys.'/course-pic85x85.png')) {
        $url_image = $webCourseHome.'/course-pic85x85.png';
        $_course['course_image_source'] = $courseSys.'/course-pic85x85.png';
    } else {
        $url_image = Display::return_icon(
            'course.png',
            null,
            null,
            ICON_SIZE_BIG,
            null,
            true,
            false
        );
    }
    $_course['course_image'] = $url_image;

    // Course large image
    $_course['course_image_large_source'] = '';
    if (file_exists($courseSys.'/course-pic.png')) {
        $url_image = $webCourseHome.'/course-pic.png';
        $_course['course_image_large_source'] = $courseSys.'/course-pic.png';
    } else {
        $url_image = Display::return_icon(
            'session_default.png',
            null,
            null,
            null,
            null,
            true,
            true
        );
    }

    $_course['course_image_large'] = $url_image;

    return $_course;
}

/**
 * Returns a difficult to guess password.
 *
 * @param int $length the length of the password
 *
 * @return string the generated password
 */
function api_generate_password($length = 8)
{
    if ($length < 2) {
        $length = 2;
    }

    $charactersLowerCase = 'abcdefghijkmnopqrstuvwxyz';
    $charactersUpperCase = 'ABCDEFGHJKLMNPQRSTUVWXYZ';
    $minNumbers = 2;
    $length = $length - $minNumbers;
    $minLowerCase = round($length / 2);
    $minUpperCase = $length - $minLowerCase;

    $password = '';
    $passwordRequirements = api_get_configuration_value('password_requirements');

    $factory = new RandomLib\Factory();
    $generator = $factory->getGenerator(new SecurityLib\Strength(SecurityLib\Strength::MEDIUM));

    if (!empty($passwordRequirements)) {
        $length = $passwordRequirements['min']['length'];
        $minNumbers = $passwordRequirements['min']['numeric'];
        $minLowerCase = $passwordRequirements['min']['lowercase'];
        $minUpperCase = $passwordRequirements['min']['uppercase'];

        $rest = $length - $minNumbers - $minLowerCase - $minUpperCase;
        // Add the rest to fill the length requirement
        if ($rest > 0) {
            $password .= $generator->generateString($rest, $charactersLowerCase.$charactersUpperCase);
        }
    }

    // Min digits default 2
    for ($i = 0; $i < $minNumbers; $i++) {
        $password .= $generator->generateInt(2, 9);
    }

    // Min lowercase
    $password .= $generator->generateString($minLowerCase, $charactersLowerCase);

    // Min uppercase
    $password .= $generator->generateString($minUpperCase, $charactersUpperCase);
    $password = str_shuffle($password);

    return $password;
}

/**
 * Checks a password to see wether it is OK to use.
 *
 * @param string $password
 *
 * @return bool if the password is acceptable, false otherwise
 *              Notes about what a password "OK to use" is:
 *              1. The password should be at least 5 characters long.
 *              2. Only English letters (uppercase or lowercase, it doesn't matter) and digits are allowed.
 *              3. The password should contain at least 3 letters.
 *              4. It should contain at least 2 digits.
 *              Settings will change if the configuration value is set: password_requirements
 */
function api_check_password($password)
{
    $passwordRequirements = Security::getPasswordRequirements();

    $minLength = $passwordRequirements['min']['length'];
    $minNumbers = $passwordRequirements['min']['numeric'];
    // Optional
    $minLowerCase = $passwordRequirements['min']['lowercase'];
    $minUpperCase = $passwordRequirements['min']['uppercase'];

    $minLetters = $minLowerCase + $minUpperCase;
    $passwordLength = api_strlen($password);

    $conditions = [
        'min_length' => $passwordLength >= $minLength,
    ];

    $digits = 0;
    $lowerCase = 0;
    $upperCase = 0;

    for ($i = 0; $i < $passwordLength; $i++) {
        $currentCharacterCode = api_ord(api_substr($password, $i, 1));
        if ($currentCharacterCode >= 65 && $currentCharacterCode <= 90) {
            $upperCase++;
        }

        if ($currentCharacterCode >= 97 && $currentCharacterCode <= 122) {
            $lowerCase++;
        }
        if ($currentCharacterCode >= 48 && $currentCharacterCode <= 57) {
            $digits++;
        }
    }

    // Min number of digits
    $conditions['min_numeric'] = $digits >= $minNumbers;

    if (!empty($minUpperCase)) {
        // Uppercase
        $conditions['min_uppercase'] = $upperCase >= $minUpperCase;
    }

    if (!empty($minLowerCase)) {
        // Lowercase
        $conditions['min_lowercase'] = $upperCase >= $minLowerCase;
    }

    // Min letters
    $letters = $upperCase + $lowerCase;
    $conditions['min_letters'] = $letters >= $minLetters;

    $isPasswordOk = true;
    foreach ($conditions as $condition) {
        if ($condition === false) {
            $isPasswordOk = false;
            break;
        }
    }

    if ($isPasswordOk === false) {
        $output = get_lang('The new password does not match the minimum security requirements').'<br />';
        $output .= Security::getPasswordRequirementsToString($conditions);

        Display::addFlash(Display::return_message($output, 'warning', false));
    }

    return $isPasswordOk;
}

/**
 * Returns the status string corresponding to the status code.
 *
 * @author Noel Dieschburg
 *
 * @param the int status code
 *
 * @return string
 */
function get_status_from_code($status_code)
{
    switch ($status_code) {
        case STUDENT:
            return get_lang('Student', '');
        case COURSEMANAGER:
            return get_lang('Teacher', '');
        case SESSIONADMIN:
            return get_lang('SessionsAdmin', '');
        case DRH:
            return get_lang('Drh', '');
    }
}

/**
 * Gets the current Chamilo (not PHP/cookie) session ID.
 *
 * @return int O if no active session, the session ID otherwise
 */
function api_get_session_id()
{
    return (int) Session::read('id_session', 0);
}

/**
 * Gets the current Chamilo (not social network) group ID.
 *
 * @return int O if no active session, the session ID otherwise
 */
function api_get_group_id()
{
    return Session::read('_gid', 0);
}

/**
 * Gets the current or given session name.
 *
 * @param   int     Session ID (optional)
 *
 * @return string The session name, or null if not found
 */
function api_get_session_name($session_id = 0)
{
    if (empty($session_id)) {
        $session_id = api_get_session_id();
        if (empty($session_id)) {
            return null;
        }
    }
    $t = Database::get_main_table(TABLE_MAIN_SESSION);
    $s = "SELECT name FROM $t WHERE id = ".(int) $session_id;
    $r = Database::query($s);
    $c = Database::num_rows($r);
    if ($c > 0) {
        //technically, there can be only one, but anyway we take the first
        $rec = Database::fetch_array($r);

        return $rec['name'];
    }

    return null;
}

/**
 * Gets the session info by id.
 *
 * @param int $id Session ID
 *
 * @return array information of the session
 */
function api_get_session_info($id)
{
    return SessionManager::fetch($id);
}

/**
 * Gets the session visibility by session id.
 *
 * @param int  $session_id
 * @param int  $courseId
 * @param bool $ignore_visibility_for_admins
 *
 * @return int
 *             0 = session still available,
 *             SESSION_VISIBLE_READ_ONLY = 1,
 *             SESSION_VISIBLE = 2,
 *             SESSION_INVISIBLE = 3
 */
function api_get_session_visibility(
    $session_id,
    $courseId = null,
    $ignore_visibility_for_admins = true
) {
    if (api_is_platform_admin()) {
        if ($ignore_visibility_for_admins) {
            return SESSION_AVAILABLE;
        }
    }

    $now = time();
    if (empty($session_id)) {
        return 0; // Means that the session is still available.
    }

    $session_id = (int) $session_id;
    $tbl_session = Database::get_main_table(TABLE_MAIN_SESSION);

    $result = Database::query("SELECT * FROM $tbl_session WHERE id = $session_id");

    if (Database::num_rows($result) <= 0) {
        return SESSION_INVISIBLE;
    }

    $row = Database::fetch_array($result, 'ASSOC');
    $visibility = $original_visibility = $row['visibility'];

    // I don't care the session visibility.
    if (empty($row['access_start_date']) && empty($row['access_end_date'])) {
        // Session duration per student.
        if (isset($row['duration']) && !empty($row['duration'])) {
            $duration = $row['duration'] * 24 * 60 * 60;
            $courseAccess = CourseManager::getFirstCourseAccessPerSessionAndUser($session_id, api_get_user_id());

            // If there is a session duration but there is no previous
            // access by the user, then the session is still available
            if (count($courseAccess) == 0) {
                return SESSION_AVAILABLE;
            }

            $currentTime = time();
            $firstAccess = isset($courseAccess['login_course_date'])
                ? api_strtotime($courseAccess['login_course_date'], 'UTC')
                : 0;
            $userDurationData = SessionManager::getUserSession(
                api_get_user_id(),
                $session_id
            );
            $userDuration = isset($userDurationData['duration'])
                ? (intval($userDurationData['duration']) * 24 * 60 * 60)
                : 0;

            $totalDuration = $firstAccess + $duration + $userDuration;

            return $totalDuration > $currentTime ? SESSION_AVAILABLE : SESSION_VISIBLE_READ_ONLY;
        }

        return SESSION_AVAILABLE;
    }

    // If start date was set.
    if (!empty($row['access_start_date'])) {
        $visibility = $now > api_strtotime($row['access_start_date'], 'UTC') ? SESSION_AVAILABLE : SESSION_INVISIBLE;
    }

    // If the end date was set.
    if (!empty($row['access_end_date'])) {
        // Only if date_start said that it was ok
        if ($visibility === SESSION_AVAILABLE) {
            $visibility = $now < api_strtotime($row['access_end_date'], 'UTC')
                ? SESSION_AVAILABLE // Date still available
                : $row['visibility']; // Session ends
        }
    }

    // If I'm a coach the visibility can change in my favor depending in the coach dates.
    $isCoach = api_is_coach($session_id, $courseId);

    if ($isCoach) {
        // Test start date.
        if (!empty($row['coach_access_start_date'])) {
            $start = api_strtotime($row['coach_access_start_date'], 'UTC');
            $visibility = $start < $now ? SESSION_AVAILABLE : SESSION_INVISIBLE;
        }

        // Test end date.
        if (!empty($row['coach_access_end_date'])) {
            if ($visibility === SESSION_AVAILABLE) {
                $endDateCoach = api_strtotime($row['coach_access_end_date'], 'UTC');
                $visibility = $endDateCoach >= $now ? SESSION_AVAILABLE : $row['visibility'];
            }
        }
    }

    return $visibility;
}

/**
 * This function returns a (star) session icon if the session is not null and
 * the user is not a student.
 *
 * @param int $sessionId
 * @param int $statusId  User status id - if 5 (student), will return empty
 *
 * @return string Session icon
 */
function api_get_session_image($sessionId, $statusId)
{
    $sessionId = (int) $sessionId;
    $image = '';
    if ($statusId != STUDENT) {
        // Check whether is not a student
        if ($sessionId > 0) {
            $image = '&nbsp;&nbsp;'.Display::return_icon(
                'star.png',
                get_lang('Session-specific resource'),
                ['align' => 'absmiddle'],
                ICON_SIZE_SMALL
            );
        }
    }

    return $image;
}

/**
 * This function add an additional condition according to the session of the course.
 *
 * @param int    $session_id        session id
 * @param bool   $and               optional, true if more than one condition false if the only condition in the query
 * @param bool   $with_base_content optional, true to accept content with session=0 as well,
 *                                  false for strict session condition
 * @param string $session_field
 *
 * @return string condition of the session
 */
function api_get_session_condition(
    $session_id,
    $and = true,
    $with_base_content = false,
    $session_field = 'session_id'
) {
    $session_id = (int) $session_id;

    if (empty($session_field)) {
        $session_field = 'session_id';
    }
    // Condition to show resources by session
    $condition_add = $and ? ' AND ' : ' WHERE ';

    if ($with_base_content) {
        $condition_session = $condition_add." ( $session_field = $session_id OR $session_field = 0 OR $session_field IS NULL) ";
    } else {
        if (empty($session_id)) {
            $condition_session = $condition_add." ($session_field = $session_id OR $session_field IS NULL)";
        } else {
            $condition_session = $condition_add." $session_field = $session_id ";
        }
    }

    return $condition_session;
}

/**
 * Returns the value of a setting from the web-adjustable admin config settings.
 *
 * WARNING true/false are stored as string, so when comparing you need to check e.g.
 * if (api_get_setting('show_navigation_menu') == 'true') //CORRECT
 * instead of
 * if (api_get_setting('show_navigation_menu') == true) //INCORRECT
 *
 * @param string $variable The variable name
 *
 * @return string
 */
function api_get_setting($variable)
{
    $settingsManager = Container::getSettingsManager();
    if (empty($settingsManager)) {
        return '';
    }
    $variable = trim($variable);

    switch ($variable) {
        case 'header_extra_content':
            $filename = api_get_path(SYS_PATH).api_get_home_path().'header_extra_content.txt';
            if (file_exists($filename)) {
                $value = file_get_contents($filename);

                return $value;
            } else {
                return '';
            }
            break;
        case 'footer_extra_content':
            $filename = api_get_path(SYS_PATH).api_get_home_path().'footer_extra_content.txt';
            if (file_exists($filename)) {
                $value = file_get_contents($filename);

                return $value;
            } else {
                return '';
            }
            break;
        case 'server_type':
            $test = ['dev', 'test'];
            $environment = Container::getEnvironment();
            if (in_array($environment, $test)) {
                return 'test';
            }

            return 'prod';
        case 'stylesheets':
            $variable = 'platform.theme';
        // deprecated settings
        // no break
        case 'openid_authentication':
        case 'service_ppt2lp':
        case 'formLogin_hide_unhide_label':
            return false;
            break;
        case 'tool_visible_by_default_at_creation':
            $values = $settingsManager->getSetting($variable);
            $newResult = [];
            foreach ($values as $parameter) {
                $newResult[$parameter] = 'true';
            }

            return $newResult;
            break;
        default:
            return $settingsManager->getSetting($variable);
            break;
    }

    global $_setting;
    if ($variable == 'header_extra_content') {
        $filename = api_get_home_path().'header_extra_content.txt';
        if (file_exists($filename)) {
            $value = file_get_contents($filename);

            return $value;
        } else {
            return '';
        }
    }
    if ($variable == 'footer_extra_content') {
        $filename = api_get_home_path().'footer_extra_content.txt';
        if (file_exists($filename)) {
            $value = file_get_contents($filename);

            return $value;
        } else {
            return '';
        }
    }
    $value = null;
    if (is_null($key)) {
        $value = ((isset($_setting[$variable]) && $_setting[$variable] != '') ? $_setting[$variable] : null);
    } else {
        if (isset($_setting[$variable][$key])) {
            $value = $_setting[$variable][$key];
        }
    }

    return $value;
}

/**
 * @param string $variable
 * @param string $option
 *
 * @return bool
 */
function api_get_setting_in_list($variable, $option)
{
    $value = api_get_setting($variable);

    return in_array($option, $value);
}

/**
 * @param string $plugin
 * @param string $variable
 *
 * @return string
 */
function api_get_plugin_setting($plugin, $variable)
{
    $variableName = $plugin.'_'.$variable;

    $params = [
        'category = ? AND subkey = ? AND variable = ?' => [
            'Plugins',
            $plugin,
            $variableName,
        ],
    ];
    $table = Database::get_main_table(TABLE_MAIN_SETTINGS_CURRENT);
    $result = Database::select(
        'selected_value',
        $table,
        ['where' => $params],
        'one'
    );
    if ($result) {
        $value = $result['selected_value'];
        $serializedValue = @unserialize($result['selected_value'], []);
        if ($serializedValue !== false) {
            $value = $serializedValue;
        }

        return $value;
    }

    return null;
    /// Old code

    $variableName = $plugin.'_'.$variable;
    $result = api_get_setting($variableName);

    if (isset($result[$plugin])) {
        $value = $result[$plugin];

        $unserialized = UnserializeApi::unserialize('not_allowed_classes', $value, true);

        if (false !== $unserialized) {
            $value = $unserialized;
        }

        return $value;
    }

    return null;
}

/**
 * Returns the value of a setting from the web-adjustable admin config settings.
 */
function api_get_settings_params($params)
{
    $table = Database::get_main_table(TABLE_MAIN_SETTINGS_CURRENT);
    $result = Database::select('*', $table, ['where' => $params]);

    return $result;
}

/**
 * @param array $params example: [id = ? => '1']
 *
 * @return array
 */
function api_get_settings_params_simple($params)
{
    $table = Database::get_main_table(TABLE_MAIN_SETTINGS_CURRENT);
    $result = Database::select('*', $table, ['where' => $params], 'one');

    return $result;
}

/**
 * Returns the value of a setting from the web-adjustable admin config settings.
 */
function api_delete_settings_params($params)
{
    $table = Database::get_main_table(TABLE_MAIN_SETTINGS_CURRENT);
    $result = Database::delete($table, $params);

    return $result;
}

/**
 * Returns an escaped version of $_SERVER['PHP_SELF'] to avoid XSS injection.
 *
 * @return string Escaped version of $_SERVER['PHP_SELF']
 */
function api_get_self()
{
    return htmlentities($_SERVER['PHP_SELF']);
}

/* USER PERMISSIONS */

/**
 * Checks whether current user is a platform administrator.
 *
 * @param bool $allowSessionAdmins Whether session admins should be considered admins or not
 * @param bool $allowDrh           Whether HR directors should be considered admins or not
 *
 * @return bool true if the user has platform admin rights,
 *              false otherwise
 *
 * @see usermanager::is_admin(user_id) for a user-id specific function
 */
function api_is_platform_admin($allowSessionAdmins = false, $allowDrh = false)
{
    $currentUser = api_get_current_user();

    if ($currentUser === null) {
        return false;
    }

    $isAdmin = Session::read('is_platformAdmin');
    if ($isAdmin) {
        return true;
    }
    $user = api_get_user_info();

    return
        isset($user['status']) &&
        (
            ($allowSessionAdmins && $user['status'] == SESSIONADMIN) ||
            ($allowDrh && $user['status'] == DRH)
        );
}

/**
 * Checks whether the user given as user id is in the admin table.
 *
 * @param int $user_id If none provided, will use current user
 * @param int $url     URL ID. If provided, also check if the user is active on given URL
 *
 * @return bool True if the user is admin, false otherwise
 */
function api_is_platform_admin_by_id($user_id = null, $url = null)
{
    $user_id = (int) $user_id;
    if (empty($user_id)) {
        $user_id = api_get_user_id();
    }
    $admin_table = Database::get_main_table(TABLE_MAIN_ADMIN);
    $sql = "SELECT * FROM $admin_table WHERE user_id = $user_id";
    $res = Database::query($sql);
    $is_admin = Database::num_rows($res) === 1;
    if (!$is_admin || !isset($url)) {
        return $is_admin;
    }
    // We get here only if $url is set
    $url = (int) $url;
    $url_user_table = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
    $sql = "SELECT * FROM $url_user_table
            WHERE access_url_id = $url AND user_id = $user_id";
    $res = Database::query($sql);
    $result = Database::num_rows($res) === 1;

    return $result;
}

/**
 * Returns the user's numeric status ID from the users table.
 *
 * @param int $user_id If none provided, will use current user
 *
 * @return int User's status (1 for teacher, 5 for student, etc)
 */
function api_get_user_status($user_id = null)
{
    $user_id = (int) $user_id;
    if (empty($user_id)) {
        $user_id = api_get_user_id();
    }
    $table = Database::get_main_table(TABLE_MAIN_USER);
    $sql = "SELECT status FROM $table WHERE user_id = $user_id ";
    $result = Database::query($sql);
    $status = null;
    if (Database::num_rows($result)) {
        $row = Database::fetch_array($result);
        $status = $row['status'];
    }

    return $status;
}

/**
 * Checks whether current user is allowed to create courses.
 *
 * @return bool true if the user has course creation rights,
 *              false otherwise
 */
function api_is_allowed_to_create_course()
{
    if (api_is_platform_admin()) {
        return true;
    }

    // Teachers can only create courses
    if (api_is_teacher()) {
        if (api_get_setting('allow_users_to_create_courses') === 'true') {
            return true;
        } else {
            return false;
        }
    }

    return Session::read('is_allowedCreateCourse');
}

/**
 * Checks whether the current user is a course administrator.
 *
 * @return bool True if current user is a course administrator
 */
function api_is_course_admin()
{
    if (api_is_platform_admin()) {
        return true;
    }

    $user = api_get_current_user();
    if ($user) {
        if (
            $user->hasRole('ROLE_CURRENT_SESSION_COURSE_TEACHER') ||
            $user->hasRole('ROLE_CURRENT_COURSE_TEACHER')
        ) {
            return true;
        }
    }

    return false;
    //return Session::read('is_courseAdmin');
}

/**
 * Checks whether the current user is a course coach
 * Based on the presence of user in session.id_coach (session general coach).
 *
 * @return bool True if current user is a course coach
 */
function api_is_session_general_coach()
{
    return Session::read('is_session_general_coach');
}

/**
 * Checks whether the current user is a course tutor
 * Based on the presence of user in session_rel_course_rel_user.user_id with status = 2.
 *
 * @return bool True if current user is a course tutor
 */
function api_is_course_tutor()
{
    return Session::read('is_courseTutor');
}

/**
 * @param int $user_id
 * @param int $courseId
 * @param int $session_id
 *
 * @return bool
 */
function api_is_course_session_coach($user_id, $courseId, $session_id)
{
    $session_table = Database::get_main_table(TABLE_MAIN_SESSION);
    $session_rel_course_rel_user_table = Database::get_main_table(TABLE_MAIN_SESSION_COURSE_USER);

    $user_id = (int) $user_id;
    $session_id = (int) $session_id;
    $courseId = (int) $courseId;

    $sql = "SELECT DISTINCT session.id
            FROM $session_table
            INNER JOIN $session_rel_course_rel_user_table session_rc_ru
            ON session.id = session_rc_ru.session_id
            WHERE
                session_rc_ru.user_id = '".$user_id."'  AND
                session_rc_ru.c_id = '$courseId' AND
                session_rc_ru.status = 2 AND
                session_rc_ru.session_id = '$session_id'";
    $result = Database::query($sql);

    return Database::num_rows($result) > 0;
}

/**
 * Checks whether the current user is a course or session coach.
 *
 * @param int $session_id
 * @param int $courseId
 * @param bool  Check whether we are in student view and, if we are, return false
 *
 * @return bool True if current user is a course or session coach
 */
function api_is_coach($session_id = 0, $courseId = null, $check_student_view = true)
{
    $userId = api_get_user_id();

    if (!empty($session_id)) {
        $session_id = (int) $session_id;
    } else {
        $session_id = api_get_session_id();
    }

    // The student preview was on
    if ($check_student_view && api_is_student_view_active()) {
        return false;
    }

    if (!empty($courseId)) {
        $courseId = (int) $courseId;
    } else {
        $courseId = api_get_course_int_id();
    }

    $session_table = Database::get_main_table(TABLE_MAIN_SESSION);
    $session_rel_course_rel_user_table = Database::get_main_table(TABLE_MAIN_SESSION_COURSE_USER);
    $sessionIsCoach = [];

    if (!empty($courseId)) {
        $sql = "SELECT DISTINCT s.id, name, access_start_date, access_end_date
                FROM $session_table s
                INNER JOIN $session_rel_course_rel_user_table session_rc_ru
                ON session_rc_ru.session_id = s.id AND session_rc_ru.user_id = '".$userId."'
                WHERE
                    session_rc_ru.c_id = '$courseId' AND
                    session_rc_ru.status = 2 AND
                    session_rc_ru.session_id = '$session_id'";
        $result = Database::query($sql);
        $sessionIsCoach = Database::store_result($result);
    }

    if (!empty($session_id)) {
        $sql = "SELECT DISTINCT id, name, access_start_date, access_end_date
                FROM $session_table
                WHERE session.id_coach = $userId AND id = $session_id
                ORDER BY access_start_date, access_end_date, name";
        $result = Database::query($sql);
        if (!empty($sessionIsCoach)) {
            $sessionIsCoach = array_merge(
                $sessionIsCoach,
                Database::store_result($result)
            );
        } else {
            $sessionIsCoach = Database::store_result($result);
        }
    }

    return count($sessionIsCoach) > 0;
}

/**
 * Checks whether the current user is a session administrator.
 *
 * @return bool True if current user is a course administrator
 */
function api_is_session_admin()
{
    $user = api_get_user_info();

    return isset($user['status']) && $user['status'] == SESSIONADMIN;
}

/**
 * Checks whether the current user is a human resources manager.
 *
 * @return bool True if current user is a human resources manager
 */
function api_is_drh()
{
    $user = api_get_user_info();

    return isset($user['status']) && $user['status'] == DRH;
}

/**
 * Checks whether the current user is a student.
 *
 * @return bool True if current user is a human resources manager
 */
function api_is_student()
{
    $user = api_get_user_info();

    return isset($user['status']) && $user['status'] == STUDENT;
}

/**
 * Checks whether the current user has the status 'teacher'.
 *
 * @return bool True if current user is a human resources manager
 */
function api_is_teacher()
{
    $user = api_get_user_info();

    return isset($user['status']) && $user['status'] == COURSEMANAGER;
}

/**
 * Checks whether the current user is a invited user.
 *
 * @return bool
 */
function api_is_invitee()
{
    $user = api_get_user_info();

    return isset($user['status']) && $user['status'] == INVITEE;
}

/**
 * This function checks whether a session is assigned into a category.
 *
 * @param int       - session id
 * @param string    - category name
 *
 * @return bool - true if is found, otherwise false
 */
function api_is_session_in_category($session_id, $category_name)
{
    $session_id = (int) $session_id;
    $category_name = Database::escape_string($category_name);
    $tbl_session = Database::get_main_table(TABLE_MAIN_SESSION);
    $tbl_session_category = Database::get_main_table(TABLE_MAIN_SESSION_CATEGORY);

    $sql = "SELECT 1
            FROM $tbl_session
            WHERE $session_id IN (
                SELECT s.id FROM $tbl_session s, $tbl_session_category sc
                WHERE
                  s.session_category_id = sc.id AND
                  sc.name LIKE '%$category_name'
            )";
    $rs = Database::query($sql);

    if (Database::num_rows($rs) > 0) {
        return true;
    } else {
        return false;
    }
}

/**
 * Displays the title of a tool.
 * Normal use: parameter is a string:
 * api_display_tool_title("My Tool").
 *
 * Optionally, there can be a subtitle below
 * the normal title, and / or a supra title above the normal title.
 *
 * e.g. supra title:
 * group
 * GROUP PROPERTIES
 *
 * e.g. subtitle:
 * AGENDA
 * calender & events tool
 *
 * @author Hugues Peeters <hugues.peeters@claroline.net>
 *
 * @param mixed $title_element - it could either be a string or an array
 *                             containing 'supraTitle', 'mainTitle',
 *                             'subTitle'
 */
function api_display_tool_title($title_element)
{
    if (is_string($title_element)) {
        $tit = $title_element;
        unset($title_element);
        $title_element['mainTitle'] = $tit;
    }
    echo '<h3>';
    if (!empty($title_element['supraTitle'])) {
        echo '<small>'.$title_element['supraTitle'].'</small><br />';
    }
    if (!empty($title_element['mainTitle'])) {
        echo $title_element['mainTitle'];
    }
    if (!empty($title_element['subTitle'])) {
        echo '<br /><small>'.$title_element['subTitle'].'</small>';
    }
    echo '</h3>';
}

/**
 * Displays options for switching between student view and course manager view.
 *
 * Changes in version 1.2 (Patrick Cool)
 * Student view switch now behaves as a real switch. It maintains its current state until the state
 * is changed explicitly
 *
 * Changes in version 1.1 (Patrick Cool)
 * student view now works correctly in subfolders of the document tool
 * student view works correctly in the new links tool
 *
 * Example code for using this in your tools:
 * //if ($is_courseAdmin && api_get_setting('student_view_enabled') == 'true') {
 * //   display_tool_view_option($isStudentView);
 * //}
 * //and in later sections, use api_is_allowed_to_edit()
 *
 * @author Roan Embrechts
 * @author Patrick Cool
 * @author Julio Montoya, changes added in Chamilo
 *
 * @version 1.2
 *
 * @todo rewrite code so it is easier to understand
 */
function api_display_tool_view_option()
{
    if (api_get_setting('student_view_enabled') != 'true') {
        return '';
    }

    $sourceurl = '';
    $is_framed = false;
    // Exceptions apply for all multi-frames pages
    if (strpos($_SERVER['REQUEST_URI'], 'chat/chat_banner.php') !== false) {
        // The chat is a multiframe bit that doesn't work too well with the student_view, so do not show the link
        return '';
    }

    // Uncomment to remove student view link from document view page
    if (strpos($_SERVER['REQUEST_URI'], 'lp/lp_header.php') !== false) {
        if (empty($_GET['lp_id'])) {
            return '';
        }
        $sourceurl = substr($_SERVER['REQUEST_URI'], 0, strpos($_SERVER['REQUEST_URI'], '?'));
        $sourceurl = str_replace(
            'lp/lp_header.php',
            'lp/lp_controller.php?'.api_get_cidreq().'&action=view&lp_id='.intval($_GET['lp_id']).'&isStudentView='.($_SESSION['studentview'] == 'studentview' ? 'false' : 'true'),
            $sourceurl
        );
        //showinframes doesn't handle student view anyway...
        //return '';
        $is_framed = true;
    }

    // Check whether the $_SERVER['REQUEST_URI'] contains already url parameters (thus a questionmark)
    if (!$is_framed) {
        if (strpos($_SERVER['REQUEST_URI'], '?') === false) {
            $sourceurl = api_get_self().'?'.api_get_cidreq();
        } else {
            $sourceurl = $_SERVER['REQUEST_URI'];
        }
    }

    $output_string = '';
    if (!empty($_SESSION['studentview'])) {
        if ($_SESSION['studentview'] == 'studentview') {
            // We have to remove the isStudentView=true from the $sourceurl
            $sourceurl = str_replace('&isStudentView=true', '', $sourceurl);
            $sourceurl = str_replace('&isStudentView=false', '', $sourceurl);
            $output_string .= '<a class="btn btn-primary btn-sm" href="'.$sourceurl.'&isStudentView=false" target="_self">'.
                Display::returnFontAwesomeIcon('eye').' '.get_lang('Switch to teacher view').'</a>';
        } elseif ($_SESSION['studentview'] == 'teacherview') {
            // Switching to teacherview
            $sourceurl = str_replace('&isStudentView=true', '', $sourceurl);
            $sourceurl = str_replace('&isStudentView=false', '', $sourceurl);
            $output_string .= '<a class="btn btn-default btn-sm" href="'.$sourceurl.'&isStudentView=true" target="_self">'.
                Display::returnFontAwesomeIcon('eye').' '.get_lang('Switch to student view').'</a>';
        }
    } else {
        $output_string .= '<a class="btn btn-default btn-sm" href="'.$sourceurl.'&isStudentView=true" target="_self">'.
            Display::returnFontAwesomeIcon('eye').' '.get_lang('Switch to student view').'</a>';
    }
    $output_string = Security::remove_XSS($output_string);
    $html = Display::tag('div', $output_string, ['class' => 'view-options']);

    return $html;
}

// TODO: This is for the permission section.
/**
 * Function that removes the need to directly use is_courseAdmin global in
 * tool scripts. It returns true or false depending on the user's rights in
 * this particular course.
 * Optionally checking for tutor and coach roles here allows us to use the
 * student_view feature altogether with these roles as well.
 *
 * @param bool  Whether to check if the user has the tutor role
 * @param bool  Whether to check if the user has the coach role
 * @param bool  Whether to check if the user has the session coach role
 * @param bool  check the student view or not
 *
 * @author Roan Embrechts
 * @author Patrick Cool
 * @author Julio Montoya
 *
 * @version 1.1, February 2004
 *
 * @return bool true: the user has the rights to edit, false: he does not
 */
function api_is_allowed_to_edit(
    $tutor = false,
    $coach = false,
    $session_coach = false,
    $check_student_view = true
) {
    $allowSessionAdminEdit = api_get_setting('session.session_admins_edit_courses_content') === true;
    // Admins can edit anything.
    if (api_is_platform_admin($allowSessionAdminEdit)) {
        //The student preview was on
        if ($check_student_view && api_is_student_view_active()) {
            return false;
        } else {
            return true;
        }
    }

    $sessionId = api_get_session_id();

    if ($sessionId && api_get_configuration_value('session_courses_read_only_mode')) {
        $efv = new ExtraFieldValue('course');
        $lockExrafieldField = $efv->get_values_by_handler_and_field_variable(
            api_get_course_int_id(),
            'session_courses_read_only_mode'
        );

        if (!empty($lockExrafieldField['value'])) {
            return false;
        }
    }

    $is_allowed_coach_to_edit = api_is_coach(null, null, $check_student_view);
    $session_visibility = api_get_session_visibility($sessionId);
    $is_courseAdmin = api_is_course_admin();

    if (!$is_courseAdmin && $tutor) {
        // If we also want to check if the user is a tutor...
        $is_courseAdmin = $is_courseAdmin || api_is_course_tutor();
    }

    if (!$is_courseAdmin && $coach) {
        // If we also want to check if the user is a coach...';
        // Check if session visibility is read only for coaches.
        if ($session_visibility == SESSION_VISIBLE_READ_ONLY) {
            $is_allowed_coach_to_edit = false;
        }

        if (api_get_setting('allow_coach_to_edit_course_session') === 'true') {
            // Check if coach is allowed to edit a course.
            $is_courseAdmin = $is_courseAdmin || $is_allowed_coach_to_edit;
        }
    }

    if (!$is_courseAdmin && $session_coach) {
        $is_courseAdmin = $is_courseAdmin || $is_allowed_coach_to_edit;
    }

    // Check if the student_view is enabled, and if so, if it is activated.
    if (api_get_setting('student_view_enabled') === 'true') {
        $studentView = api_is_student_view_active();
        if (!empty($sessionId)) {
            // Check if session visibility is read only for coaches.
            if ($session_visibility == SESSION_VISIBLE_READ_ONLY) {
                $is_allowed_coach_to_edit = false;
            }

            $is_allowed = false;
            if (api_get_setting('allow_coach_to_edit_course_session') === 'true') {
                // Check if coach is allowed to edit a course.
                $is_allowed = $is_allowed_coach_to_edit;
            }
            if ($check_student_view) {
                $is_allowed = $is_allowed && $studentView === false;
            }
        } else {
            $is_allowed = $is_courseAdmin;
            if ($check_student_view) {
                $is_allowed = $is_courseAdmin && $studentView === false;
            }
        }

        return $is_allowed;
    } else {
        return $is_courseAdmin;
    }
}

/**
 * Returns true if user is a course coach of at least one course in session.
 *
 * @param int $sessionId
 *
 * @return bool
 */
function api_is_coach_of_course_in_session($sessionId)
{
    if (api_is_platform_admin()) {
        return true;
    }

    $userId = api_get_user_id();
    $courseList = UserManager::get_courses_list_by_session(
        $userId,
        $sessionId
    );

    // Session visibility.
    $visibility = api_get_session_visibility(
        $sessionId,
        null,
        false
    );

    if ($visibility != SESSION_VISIBLE && !empty($courseList)) {
        // Course Coach session visibility.
        $blockedCourseCount = 0;
        $closedVisibilityList = [
            COURSE_VISIBILITY_CLOSED,
            COURSE_VISIBILITY_HIDDEN,
        ];

        foreach ($courseList as $course) {
            // Checking session visibility
            $sessionCourseVisibility = api_get_session_visibility(
                $sessionId,
                $course['real_id']
            );

            $courseIsVisible = !in_array(
                $course['visibility'],
                $closedVisibilityList
            );
            if ($courseIsVisible === false || $sessionCourseVisibility == SESSION_INVISIBLE) {
                $blockedCourseCount++;
            }
        }

        // If all courses are blocked then no show in the list.
        if ($blockedCourseCount === count($courseList)) {
            $visibility = SESSION_INVISIBLE;
        } else {
            $visibility = SESSION_VISIBLE;
        }
    }

    switch ($visibility) {
        case SESSION_VISIBLE_READ_ONLY:
        case SESSION_VISIBLE:
        case SESSION_AVAILABLE:
            return true;
            break;
        case SESSION_INVISIBLE:
            return false;
    }

    return false;
}

/**
 * Checks if a student can edit contents in a session depending
 * on the session visibility.
 *
 * @param bool $tutor Whether to check if the user has the tutor role
 * @param bool $coach Whether to check if the user has the coach role
 *
 * @return bool true: the user has the rights to edit, false: he does not
 */
function api_is_allowed_to_session_edit($tutor = false, $coach = false)
{
    if (api_is_allowed_to_edit($tutor, $coach)) {
        // If I'm a teacher, I will return true in order to not affect the normal behaviour of Chamilo tools.
        return true;
    } else {
        $sessionId = api_get_session_id();

        if ($sessionId == 0) {
            // I'm not in a session so i will return true to not affect the normal behaviour of Chamilo tools.
            return true;
        } else {
            // I'm in a session and I'm a student
            // Get the session visibility
            $session_visibility = api_get_session_visibility($sessionId);
            // if 5 the session is still available
            switch ($session_visibility) {
                case SESSION_VISIBLE_READ_ONLY: // 1
                    return false;
                case SESSION_VISIBLE:           // 2
                    return true;
                case SESSION_INVISIBLE:         // 3
                    return false;
                case SESSION_AVAILABLE:         //5
                    return true;
            }
        }
    }
}

/**
 * Checks whether the user is allowed in a specific tool for a specific action.
 *
 * @param string $tool   the tool we are checking if the user has a certain permission
 * @param string $action the action we are checking (add, edit, delete, move, visibility)
 *
 * @return bool
 *
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
 * @author Julio Montoya
 *
 * @version 1.0
 */
function api_is_allowed($tool, $action, $task_id = 0)
{
    $_user = api_get_user_info();
    $_course = api_get_course_info();

    if (api_is_course_admin()) {
        return true;
    }

    if (is_array($_course) and count($_course) > 0) {
        require_once api_get_path(SYS_CODE_PATH).'permissions/permissions_functions.inc.php';

        // Getting the permissions of this user.
        if ($task_id == 0) {
            $user_permissions = get_permissions('user', $_user['user_id']);
            $_SESSION['total_permissions'][$_course['code']] = $user_permissions;
        }

        // Getting the permissions of the task.
        if ($task_id != 0) {
            $task_permissions = get_permissions('task', $task_id);
            /* !!! */$_SESSION['total_permissions'][$_course['code']] = $task_permissions;
        }
        //print_r($_SESSION['total_permissions']);

        // Getting the permissions of the groups of the user
        //$groups_of_user = GroupManager::get_group_ids($_course['db_name'], $_user['user_id']);

        //foreach($groups_of_user as $group)
        //   $this_group_permissions = get_permissions('group', $group);

        // Getting the permissions of the courseroles of the user
        $user_courserole_permissions = get_roles_permissions('user', $_user['user_id']);

        // Getting the permissions of the platformroles of the user
        //$user_platformrole_permissions = get_roles_permissions('user', $_user['user_id'], ', platform');

        // Getting the permissions of the roles of the groups of the user
        //foreach($groups_of_user as $group)
        //    $this_group_courserole_permissions = get_roles_permissions('group', $group);

        // Getting the permissions of the platformroles of the groups of the user
        //foreach($groups_of_user as $group)
        //    $this_group_platformrole_permissions = get_roles_permissions('group', $group, 'platform');
    }

    // If the permissions are limited, we have to map the extended ones to the limited ones.
    if (api_get_setting('permissions') == 'limited') {
        if ($action == 'Visibility') {
            $action = 'Edit';
        }
        if ($action == 'Move') {
            $action = 'Edit';
        }
    }

    // The session that contains all the permissions already exists for this course
    // so there is no need to requery everything.
    //my_print_r($_SESSION['total_permissions'][$_course['code']][$tool]);
    if (is_array($_SESSION['total_permissions'][$_course['code']][$tool])) {
        if (in_array($action, $_SESSION['total_permissions'][$_course['code']][$tool])) {
            return true;
        } else {
            return false;
        }
    }
}

/**
 * Tells whether this user is an anonymous user.
 *
 * @param int  $user_id  User ID (optional, will take session ID if not provided)
 * @param bool $db_check Whether to check in the database (true) or simply in
 *                       the session (false) to see if the current user is the anonymous user
 *
 * @return bool true if this user is anonymous, false otherwise
 */
function api_is_anonymous($user_id = null, $db_check = false)
{
    if ($db_check) {
        if (!isset($user_id)) {
            $user_id = api_get_user_id();
        }

        $info = api_get_user_info($user_id);

        if ($info['status'] == 6 || $user_id == 0 || empty($info)) {
            return true;
        }
    }

    return !Container::getAuthorizationChecker()->isGranted('IS_AUTHENTICATED_FULLY');
}

/**
 * Displays message "You are not allowed here..." and exits the entire script.
 *
 * @param bool   $print_headers Whether or not to print headers (default = false -> does not print them)
 * @param string $message
 * @param int    $responseCode
 */
function api_not_allowed(
    $print_headers = false,
    $message = null,
    $responseCode = 0
) {
    $debug = api_get_setting('server_type') === 'test';

    // Default code is 403 forbidden
    $responseCode = empty($responseCode) ? 403 : $responseCode;
    $message = empty($message) ? get_lang('Not authorized') : $message;

    // Create new exception rendered by template:
    // src/ThemeBundle/Resources/views/Exception/error.html.twig

    // if error is 404 then the template is:
    // src/ThemeBundle/Resources/views/Exception/error404.html.twig
    $exception = new Exception($message);
    $request = Container::getRequest();
    $exception = FlattenException::create($exception, $responseCode);
    $controller = new ExceptionController(Container::getTwig(), $debug);
    $response = $controller->showAction($request, $exception);
    $response->send();
    exit;

    $home_url = api_get_path(WEB_PATH);
    $user_id = api_get_user_id();
    $course = api_get_course_id();

    global $this_section;

    if (CustomPages::enabled() && !isset($user_id)) {
        if (empty($user_id)) {
            // Why the CustomPages::enabled() need to be to set the request_uri
            $_SESSION['request_uri'] = $_SERVER['REQUEST_URI'];
        }
        CustomPages::display(CustomPages::INDEX_UNLOGGED);
    }

    $origin = api_get_origin();

    $msg = null;
    if (isset($message)) {
        $msg = $message;
    } else {
        $msg = Display::return_message(
            get_lang('Sorry, you are not allowed to access this page, or maybe your connection has expired. Please click your browser\'s "Back" button or follow the link below to return to the previous page.').'
            <script>function goBack(){window.history.back();}</script>',
            'error',
            false
        );
        $msg .= '<p class="text-center">
             <a onclick="goBack();" class="btn btn-default" href="'.$home_url.'">'.get_lang('Go back').'</a>
             </p>';
    }

    $msg = Display::div($msg, ['align' => 'center']);

    $show_headers = 0;
    if ($print_headers && $origin != 'learnpath') {
        $show_headers = 1;
    }

    $tpl = new Template(null, $show_headers, $show_headers, false, true, false, true, $responseCode);
    $tpl->assign('hide_login_link', 1);
    $tpl->assign('content', $msg);

    if (($user_id != 0 && !api_is_anonymous()) &&
        (!isset($course) || $course == -1) &&
        empty($_GET['cidReq'])
    ) {
        // if the access is not authorized and there is some login information
        // but the cidReq is not found, assume we are missing course data and send the user
        // to the user_portal
        $tpl->display_one_col_template();
        exit;
    }

    if (!empty($_SERVER['REQUEST_URI']) &&
        (
            !empty($_GET['cidReq']) ||
            $this_section == SECTION_MYPROFILE ||
            $this_section == SECTION_PLATFORM_ADMIN
        )
    ) {
        $courseCode = api_get_course_id();
        // Only display form and return to the previous URL if there was a course ID included
        if ($user_id != 0 && !api_is_anonymous()) {
            //if there is a user ID, then the user is not allowed but the session is still there. Say so and exit
            $tpl->assign('content', $msg);
            $tpl->display_one_col_template();
            exit;
        }

        if (!is_null($courseCode)) {
            api_set_firstpage_parameter($courseCode);
        }

        // If the user has no user ID, then his session has expired
        $form = api_get_not_allowed_login_form();

        // see same text in auth/gotocourse.php and main_api.lib.php function api_not_allowed (above)
        $content = Display::return_message(get_lang('You are not allowed to see this page. Either your connection has expired or you are trying to access a page for which you do not have the sufficient privileges.'), 'error', false);

        if (!empty($courseCode)) {
            $content .= '<h4>'.get_lang('Please login to go to this course').'</h4>';
        }

        $content .= '<div class="well">';
        $content .= $form->returnForm();
        $content .= '</div>';
        if (!empty($courseCode)) {
            $content .= '<hr/><p style="text-align:center"><a href="'.$home_url.'">'.
                get_lang('Return to Course Homepage').'</a></p>';
        } else {
            $content .= '<hr/><p style="text-align:center"><a href="'.$home_url.'">'.
                get_lang('Back to Home Page.').'</a></p>';
        }

        $tpl->setLoginBodyClass();
        $tpl->assign('content', $content);
        $tpl->display_one_col_template();
        exit;
    }

    if ($user_id != 0 && !api_is_anonymous()) {
        $tpl->display_one_col_template();
        exit;
    }

    $msg = null;
    // The session is over and we were not in a course,
    // or we try to get directly to a private course without being logged
    $courseId = api_get_course_int_id();
    if (!empty($courseId)) {
        api_set_firstpage_parameter(api_get_course_id());
        $tpl->setLoginBodyClass();

        // see same text in auth/gotocourse.php and main_api.lib.php function api_not_allowed (bellow)
        $msg = Display::return_message(get_lang('You are not allowed to see this page. Either your connection has expired or you are trying to access a page for which you do not have the sufficient privileges.'), 'error', false);
        $msg .= '<h4>'.get_lang('Please login to go to this course').'</h4>';
        $form = api_get_not_allowed_login_form();
        $msg .= '<div class="well">';
        $msg .= $form->returnForm();
        $msg .= '</div>';
        if ($casEnabled) {
            $msg .= "</div>";
        }
    } else {
        // we were not in a course, return to home page
        $msg = Display::return_message(
            get_lang('You are not allowed to see this page. Either your connection has expired or you are trying to access a page for which you do not have the sufficient privileges.'),
            'error',
            false
        );

        $msg .= '<p class="text-center">
                 <a class="btn btn-default" href="'.$home_url.'">'.get_lang('Back to Home Page.').'</a>
                 </p>';

        if (!empty($message)) {
            $msg = $message;
        }

        if (api_is_anonymous()) {
            $form = api_get_not_allowed_login_form();
            $msg .= '<div class="well">';
            $msg .= $form->returnForm();
            $msg .= '</div>';
        }
    }

    $tpl->assign('content', $msg);
    $tpl->display_one_col_template();
    exit;
}

/**
 * @return FormValidator
 */
function api_get_not_allowed_login_form()
{
    $action = api_get_self().'?'.Security::remove_XSS($_SERVER['QUERY_STRING']);
    $action = str_replace('&amp;', '&', $action);
    Session::write('redirect_after_not_allow_page', $action);
    $action .= '&redirect_after_not_allow_page=1';

    $form = new FormValidator(
        'formLogin',
        'post',
        $action,
        null,
        ['class' => 'form-stacked']
    );
    $params = [
        'placeholder' => get_lang('Username'),
        'class' => 'col-md-3',
    ];
    if (api_browser_support('autocapitalize')) {
        $params['autocapitalize'] = 'none';
    }

    $form->addElement(
        'text',
        'login',
        null,
        $params
    );
    $form->addElement(
        'password',
        'password',
        null,
        ['placeholder' => get_lang('Password'), 'class' => 'col-md-3']
    ); //new
    $form->addButtonNext(get_lang('Login'), 'submitAuth');

    return $form;
}

/**
 * Gets a UNIX timestamp from a database (MySQL) datetime format string.
 *
 * @param $last_post_datetime standard output date in a sql query
 *
 * @return int timestamp
 *
 * @author Toon Van Hoecke <Toon.VanHoecke@UGent.be>
 *
 * @version October 2003
 * @desc convert sql date to unix timestamp
 */
function convert_sql_date($last_post_datetime)
{
    list($last_post_date, $last_post_time) = explode(' ', $last_post_datetime);
    list($year, $month, $day) = explode('-', $last_post_date);
    list($hour, $min, $sec) = explode(':', $last_post_time);

    return mktime((int) $hour, (int) $min, (int) $sec, (int) $month, (int) $day, (int) $year);
}

/**
 * Gets item visibility from the item_property table.
 *
 * Getting the visibility is done by getting the last updated visibility entry,
 * using the largest session ID found if session 0 and another was found (meaning
 * the only one that is actually from the session, in case there are results from
 * session 0 *AND* session n).
 *
 * @param array  $_course  Course properties array (result of api_get_course_info())
 * @param string $tool     Tool (learnpath, document, etc)
 * @param int    $id       The item ID in the given tool
 * @param int    $session  The session ID (optional)
 * @param int    $user_id
 * @param string $type
 * @param string $group_id
 *
 * @return int -1 on error, 0 if invisible, 1 if visible
 */
function api_get_item_visibility(
    $_course,
    $tool,
    $id,
    $session = 0,
    $user_id = null,
    $type = null,
    $group_id = null
) {
    if (!is_array($_course) || count($_course) == 0 || empty($tool) || empty($id)) {
        return -1;
    }

    $tool = Database::escape_string($tool);
    $id = (int) $id;
    $session = (int) $session;
    $TABLE_ITEMPROPERTY = Database::get_course_table(TABLE_ITEM_PROPERTY);
    $course_id = (int) $_course['real_id'];

    $userCondition = '';
    if (!empty($user_id)) {
        $user_id = (int) $user_id;
        $userCondition = " AND to_user_id = $user_id ";
    }

    $typeCondition = '';
    if (!empty($type)) {
        $type = Database::escape_string($type);
        $typeCondition = " AND lastedit_type = '$type' ";
    }

    $groupCondition = '';
    if (!empty($group_id)) {
        $group_id = (int) $group_id;
        $groupCondition = " AND to_group_id = '$group_id' ";
    }

    $sql = "SELECT visibility
            FROM $TABLE_ITEMPROPERTY
            WHERE
                c_id = $course_id AND
                tool = '$tool' AND
                ref = $id AND
                (session_id = $session OR session_id = 0 OR session_id IS NULL)
                $userCondition $typeCondition $groupCondition
            ORDER BY session_id DESC, lastedit_date DESC
            LIMIT 1";

    $res = Database::query($sql);
    if ($res === false || Database::num_rows($res) == 0) {
        return -1;
    }
    $row = Database::fetch_array($res);

    return (int) $row['visibility'];
}

/**
 * Delete a row in the c_item_property table.
 *
 * @param array  $courseInfo
 * @param string $tool
 * @param int    $itemId
 * @param int    $userId
 * @param int    $groupId    group.iid
 * @param int    $sessionId
 *
 * @return false|null
 */
function api_item_property_delete(
    $courseInfo,
    $tool,
    $itemId,
    $userId,
    $groupId = 0,
    $sessionId = 0
) {
    if (empty($courseInfo)) {
        return false;
    }

    $courseId = (int) $courseInfo['real_id'];

    if (empty($courseId) || empty($tool) || empty($itemId)) {
        return false;
    }

    $table = Database::get_course_table(TABLE_ITEM_PROPERTY);
    $tool = Database::escape_string($tool);
    $itemId = intval($itemId);
    $userId = intval($userId);
    $groupId = intval($groupId);
    $sessionId = intval($sessionId);

    $groupCondition = " AND to_group_id = $groupId ";
    if (empty($groupId)) {
        $groupCondition = " AND (to_group_id is NULL OR to_group_id = 0) ";
    }

    $userCondition = " AND to_user_id = $userId ";
    if (empty($userId)) {
        $userCondition = " AND (to_user_id is NULL OR to_user_id = 0) ";
    }
    $sessionCondition = api_get_session_condition($sessionId, true, false, 'session_id');
    $sql = "DELETE FROM $table
            WHERE
                c_id = $courseId AND
                tool  = '$tool' AND
                ref = $itemId
                $sessionCondition
                $userCondition
                $groupCondition
            ";

    Database::query($sql);
}

/**
 * Updates or adds item properties to the Item_propetry table
 * Tool and lastedit_type are language independant strings (langvars->get_lang!).
 *
 * @param array  $_course        array with course properties
 * @param string $tool           tool id, linked to 'rubrique' of the course tool_list (Warning: language sensitive !!)
 * @param int    $item_id        id of the item itself, linked to key of every tool ('id', ...)
 * @param string $last_edit_type add or update action
 *                               (1) message to be translated (in trad4all) : e.g. DocumentAdded, DocumentUpdated;
 *                               (2) "delete"
 *                               (3) "visible"
 *                               (4) "invisible"
 * @param int    $user_id        id of the editing/adding user
 * @param array  $groupInfo      must include group.iid/group.od
 * @param int    $to_user_id     id of the intended user (always has priority over $to_group_id !), only relevant for $type (1)
 * @param string $start_visible  0000-00-00 00:00:00 format
 * @param string $end_visible    0000-00-00 00:00:00 format
 * @param int    $session_id     The session ID, if any, otherwise will default to 0
 *
 * @return bool false if update fails
 *
 * @author Toon Van Hoecke <Toon.VanHoecke@UGent.be>, Ghent University
 *
 * @version January 2005
 * @desc update the item_properties table (if entry not exists, insert) of the course
 */
function api_item_property_update(
    $_course,
    $tool,
    $item_id,
    $last_edit_type,
    $user_id,
    $groupInfo = [],
    $to_user_id = null,
    $start_visible = '',
    $end_visible = '',
    $session_id = 0
) {
    if (empty($_course)) {
        return false;
    }

    $course_id = $_course['real_id'];

    if (empty($course_id)) {
        return false;
    }

    $to_group_id = 0;
    if (!empty($groupInfo) && isset($groupInfo['iid'])) {
        $to_group_id = (int) $groupInfo['iid'];
    }

    $em = Database::getManager();

    // Definition of variables.
    $tool = Database::escape_string($tool);
    $item_id = (int) $item_id;
    $lastEditTypeNoFilter = $last_edit_type;
    $last_edit_type = Database::escape_string($last_edit_type);
    $user_id = (int) $user_id;

    $startVisible = "NULL";
    if (!empty($start_visible)) {
        $start_visible = Database::escape_string($start_visible);
        $startVisible = "'$start_visible'";
    }

    $endVisible = "NULL";
    if (!empty($end_visible)) {
        $end_visible = Database::escape_string($end_visible);
        $endVisible = "'$end_visible'";
    }

    $to_filter = '';
    $time = api_get_utc_datetime();

    if (!empty($session_id)) {
        $session_id = (int) $session_id;
    } else {
        $session_id = api_get_session_id();
    }

    // Definition of tables.
    $tableItemProperty = Database::get_course_table(TABLE_ITEM_PROPERTY);

    if ($to_user_id <= 0) {
        $to_user_id = null; // No to_user_id set
    }

    if (!is_null($to_user_id)) {
        // $to_user_id has more priority than $to_group_id
        $to_user_id = (int) $to_user_id;
        $to_field = 'to_user_id';
        $to_value = $to_user_id;
    } else {
        // $to_user_id is not set.
        $to_field = 'to_group_id';
        $to_value = $to_group_id;
    }

    $toValueCondition = empty($to_value) ? 'NULL' : "'$to_value'";
    // Set filters for $to_user_id and $to_group_id, with priority for $to_user_id
    $condition_session = " AND session_id = $session_id ";
    if (empty($session_id)) {
        $condition_session = ' AND (session_id = 0 OR session_id IS NULL) ';
    }

    $filter = " c_id = $course_id AND tool = '$tool' AND ref = $item_id $condition_session ";

    // Check whether $to_user_id and $to_group_id are passed in the function call.
    // If both are not passed (both are null) then it is a message for everybody and $to_group_id should be 0 !
    if (is_null($to_user_id) && is_null($to_group_id)) {
        $to_group_id = 0;
    }

    if (!is_null($to_user_id)) {
        // Set filter to intended user.
        $to_filter = " AND to_user_id = $to_user_id $condition_session";
    } else {
        // Set filter to intended group.
        if (($to_group_id != 0) && $to_group_id == strval(intval($to_group_id))) {
            $to_filter = " AND to_group_id = $to_group_id $condition_session";
        }
    }

    // Adding filter if set.
    $filter .= $to_filter;

    // Update if possible
    $set_type = '';

    switch ($lastEditTypeNoFilter) {
        case 'delete':
            // delete = make item only visible for the platform admin.
            $visibility = '2';
            if (!empty($session_id)) {
                // Check whether session id already exist into item_properties for updating visibility or add it.
                $sql = "SELECT session_id FROM $tableItemProperty
                        WHERE
                            c_id = $course_id AND
                            tool = '$tool' AND
                            ref = $item_id AND
                            session_id = $session_id";
                $rs = Database::query($sql);
                if (Database::num_rows($rs) > 0) {
                    $sql = "UPDATE $tableItemProperty
                            SET lastedit_type       = '".str_replace('_', '', ucwords($tool))."Deleted',
                                lastedit_date       = '$time',
                                lastedit_user_id    = $user_id,
                                visibility          = $visibility,
                                session_id          = $session_id $set_type
                            WHERE $filter";
                    $result = Database::query($sql);
                } else {
                    $sql = "INSERT INTO $tableItemProperty (c_id, tool, ref, insert_date, insert_user_id, lastedit_date, lastedit_type, lastedit_user_id, $to_field, visibility, start_visible, end_visible, session_id)
                            VALUES ($course_id, '$tool',$item_id, '$time', $user_id, '$time', '$last_edit_type',$user_id, $toValueCondition, $visibility, $startVisible, $endVisible, $session_id)";
                    $result = Database::query($sql);
                    $id = Database::insert_id();
                    if ($id) {
                        $sql = "UPDATE $tableItemProperty SET id = iid WHERE iid = $id";
                        Database::query($sql);
                    }
                }
            } else {
                $sql = "UPDATE $tableItemProperty
                        SET
                            lastedit_type='".str_replace('_', '', ucwords($tool))."Deleted',
                            lastedit_date='$time',
                            lastedit_user_id = $user_id,
                            visibility = $visibility $set_type
                        WHERE $filter";
                $result = Database::query($sql);
            }
            break;
        case 'visible': // Change item to visible.
            $visibility = '1';
            if (!empty($session_id)) {
                // Check whether session id already exist into item_properties for updating visibility or add it.
                $sql = "SELECT session_id FROM $tableItemProperty
                        WHERE
                            c_id = $course_id AND
                            tool = '$tool' AND
                            ref = $item_id AND
                            session_id = $session_id";
                $rs = Database::query($sql);
                if (Database::num_rows($rs) > 0) {
                    $sql = "UPDATE $tableItemProperty
                            SET
                                lastedit_type='".str_replace('_', '', ucwords($tool))."Visible',
                                lastedit_date='$time',
                                lastedit_user_id = $user_id,
                                visibility = $visibility,
                                session_id = $session_id $set_type
                            WHERE $filter";
                    $result = Database::query($sql);
                } else {
                    $sql = "INSERT INTO $tableItemProperty (c_id, tool, ref, insert_date, insert_user_id, lastedit_date, lastedit_type, lastedit_user_id, $to_field, visibility, start_visible, end_visible, session_id)
                            VALUES ($course_id, '$tool', $item_id, '$time', $user_id, '$time', '$last_edit_type', $user_id, $toValueCondition, $visibility, $startVisible, $endVisible, $session_id)";
                    $result = Database::query($sql);
                    $id = Database::insert_id();
                    if ($id) {
                        $sql = "UPDATE $tableItemProperty SET id = iid WHERE iid = $id";
                        Database::query($sql);
                    }
                }
            } else {
                $sql = "UPDATE $tableItemProperty
                        SET
                            lastedit_type='".str_replace('_', '', ucwords($tool))."Visible',
                            lastedit_date='$time',
                            lastedit_user_id = $user_id,
                            visibility = $visibility $set_type
                        WHERE $filter";
                $result = Database::query($sql);
            }
            break;
        case 'invisible': // Change item to invisible.
            $visibility = '0';
            if (!empty($session_id)) {
                // Check whether session id already exist into item_properties for updating visibility or add it
                $sql = "SELECT session_id FROM $tableItemProperty
                        WHERE
                            c_id = $course_id AND
                            tool = '$tool' AND
                            ref = $item_id AND
                            session_id = $session_id";
                $rs = Database::query($sql);
                if (Database::num_rows($rs) > 0) {
                    $sql = "UPDATE $tableItemProperty
                            SET
                                lastedit_type = '".str_replace('_', '', ucwords($tool))."Invisible',
                                lastedit_date = '$time',
                                lastedit_user_id = $user_id,
                                visibility = $visibility,
                                session_id = $session_id $set_type
                            WHERE $filter";
                    $result = Database::query($sql);
                } else {
                    $sql = "INSERT INTO $tableItemProperty (c_id, tool, ref, insert_date, insert_user_id, lastedit_date, lastedit_type, lastedit_user_id,$to_field, visibility, start_visible, end_visible, session_id)
                            VALUES ($course_id, '$tool', $item_id, '$time', $user_id, '$time', '$last_edit_type', $user_id, $toValueCondition, $visibility, $startVisible, $endVisible, $session_id)";
                    $result = Database::query($sql);
                    $id = Database::insert_id();
                    if ($id) {
                        $sql = "UPDATE $tableItemProperty SET id = iid WHERE iid = $id";
                        Database::query($sql);
                    }
                }
            } else {
                $sql = "UPDATE $tableItemProperty
                        SET
                            lastedit_type = '".str_replace('_', '', ucwords($tool))."Invisible',
                            lastedit_date = '$time',
                            lastedit_user_id = $user_id,
                            visibility = $visibility $set_type
                        WHERE $filter";
                $result = Database::query($sql);
            }
            break;
        default: // The item will be added or updated.
            $set_type = ", lastedit_type = '$last_edit_type' ";
            $visibility = '1';
            //$filter .= $to_filter; already added
            $sql = "UPDATE $tableItemProperty
                    SET
                      lastedit_date = '$time',
                      lastedit_user_id = $user_id $set_type
                    WHERE $filter";
            $result = Database::query($sql);
    }

    // Insert if no entries are found (can only happen in case of $last_edit_type switch is 'default').
    if ($result == false || Database::affected_rows($result) == 0) {
        $objCourse = $em->find('ChamiloCoreBundle:Course', intval($course_id));
        $objTime = new DateTime('now', new DateTimeZone('UTC'));
        $objUser = api_get_user_entity($user_id);
        if (empty($objUser)) {
            // Use anonymous
            $user_id = api_get_anonymous_id();
            $objUser = api_get_user_entity($user_id);
        }

        $objGroup = null;
        if (!empty($to_group_id)) {
            $objGroup = $em->find('ChamiloCourseBundle:CGroupInfo', $to_group_id);
        }

        $objToUser = api_get_user_entity($to_user_id);
        $objSession = $em->find('ChamiloCoreBundle:Session', intval($session_id));

        $startVisibleDate = !empty($start_visible) ? new DateTime($start_visible, new DateTimeZone('UTC')) : null;
        $endVisibleDate = !empty($endVisibleDate) ? new DateTime($endVisibleDate, new DateTimeZone('UTC')) : null;

        $cItemProperty = new CItemProperty($objCourse);
        $cItemProperty
            ->setTool($tool)
            ->setRef($item_id)
            ->setInsertDate($objTime)
            ->setInsertUser($objUser)
            ->setLasteditDate($objTime)
            ->setLasteditType($last_edit_type)
            ->setGroup($objGroup)
            ->setToUser($objToUser)
            ->setVisibility($visibility)
            ->setStartVisible($startVisibleDate)
            ->setEndVisible($endVisibleDate)
            ->setSession($objSession);

        $em->persist($cItemProperty);
        $em->flush();

        $id = $cItemProperty->getIid();

        if ($id) {
            $cItemProperty->setId($id);
            $em->merge($cItemProperty);
            $em->flush();

            return false;
        }
    }

    return true;
}

/**
 * Gets item property by tool.
 *
 * @param string    course code
 * @param string    tool name, linked to 'rubrique' of the course tool_list (Warning: language sensitive !!)
 * @param int       id of the item itself, linked to key of every tool ('id', ...), "*" = all items of the tool
 * @param int    $session_id
 * @param string $tool
 * @param string $course_code
 *
 * @return array All fields from c_item_property (all rows found) or empty array
 */
function api_get_item_property_by_tool($tool, $course_code, $session_id = null)
{
    $course_info = api_get_course_info($course_code);
    $tool = Database::escape_string($tool);

    // Definition of tables.
    $item_property_table = Database::get_course_table(TABLE_ITEM_PROPERTY);
    $session_id = (int) $session_id;
    $session_condition = ' AND session_id = '.$session_id;
    if (empty($session_id)) {
        $session_condition = " AND (session_id = 0 OR session_id IS NULL) ";
    }
    $course_id = $course_info['real_id'];

    $sql = "SELECT * FROM $item_property_table
            WHERE
                c_id = $course_id AND
                tool = '$tool'
                $session_condition ";
    $rs = Database::query($sql);
    $list = [];
    if (Database::num_rows($rs) > 0) {
        while ($row = Database::fetch_array($rs, 'ASSOC')) {
            $list[] = $row;
        }
    }

    return $list;
}

/**
 * Gets item property by tool and user.
 *
 * @param int $userId
 * @param int $tool
 * @param int $courseId
 * @param int $session_id
 *
 * @return array
 */
function api_get_item_property_list_by_tool_by_user(
    $userId,
    $tool,
    $courseId,
    $session_id = 0
) {
    $userId = intval($userId);
    $tool = Database::escape_string($tool);
    $session_id = intval($session_id);
    $courseId = intval($courseId);

    // Definition of tables.
    $item_property_table = Database::get_course_table(TABLE_ITEM_PROPERTY);
    $session_condition = ' AND session_id = '.$session_id;
    if (empty($session_id)) {
        $session_condition = " AND (session_id = 0 OR session_id IS NULL) ";
    }
    $sql = "SELECT * FROM $item_property_table
            WHERE
                insert_user_id = $userId AND
                c_id = $courseId AND
                tool = '$tool'
                $session_condition ";

    $rs = Database::query($sql);
    $list = [];
    if (Database::num_rows($rs) > 0) {
        while ($row = Database::fetch_array($rs, 'ASSOC')) {
            $list[] = $row;
        }
    }

    return $list;
}

/**
 * Gets item property id from tool of a course.
 *
 * @param string $course_code course code
 * @param string $tool        tool name, linked to 'rubrique' of the course tool_list (Warning: language sensitive !!)
 * @param int    $ref         id of the item itself, linked to key of every tool ('id', ...), "*" = all items of the tool
 * @param int    $sessionId   Session ID (optional)
 *
 * @return int
 */
function api_get_item_property_id($course_code, $tool, $ref, $sessionId = 0)
{
    $course_info = api_get_course_info($course_code);
    $tool = Database::escape_string($tool);
    $ref = (int) $ref;

    // Definition of tables.
    $tableItemProperty = Database::get_course_table(TABLE_ITEM_PROPERTY);
    $course_id = $course_info['real_id'];
    $sessionId = (int) $sessionId;
    $sessionCondition = " AND session_id = $sessionId ";
    if (empty($sessionId)) {
        $sessionCondition = ' AND (session_id = 0 OR session_id IS NULL) ';
    }
    $sql = "SELECT id FROM $tableItemProperty
            WHERE
                c_id = $course_id AND
                tool = '$tool' AND
                ref = $ref
                $sessionCondition";
    $rs = Database::query($sql);
    $item_property_id = '';
    if (Database::num_rows($rs) > 0) {
        $row = Database::fetch_array($rs);
        $item_property_id = $row['id'];
    }

    return $item_property_id;
}

/**
 * Inserts a record in the track_e_item_property table (No update).
 *
 * @param string $tool
 * @param int    $ref
 * @param string $title
 * @param string $content
 * @param int    $progress
 *
 * @return bool|int
 */
function api_track_item_property_update($tool, $ref, $title, $content, $progress)
{
    $tbl_stats_item_property = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ITEM_PROPERTY);
    $course_id = api_get_course_int_id(); //numeric
    $course_code = api_get_course_id(); //alphanumeric
    $item_property_id = api_get_item_property_id($course_code, $tool, $ref);
    if (!empty($item_property_id)) {
        $sql = "INSERT IGNORE INTO $tbl_stats_item_property SET
                course_id           = '$course_id',
                item_property_id    = '$item_property_id',
                title               = '".Database::escape_string($title)."',
                content             = '".Database::escape_string($content)."',
                progress            = '".intval($progress)."',
                lastedit_date       = '".api_get_utc_datetime()."',
                lastedit_user_id    = '".api_get_user_id()."',
                session_id          = '".api_get_session_id()."'";
        $result = Database::query($sql);
        $affected_rows = Database::affected_rows($result);

        return $affected_rows;
    }

    return false;
}

/**
 * @param string $tool
 * @param int    $ref
 *
 * @return array|resource
 */
function api_get_track_item_property_history($tool, $ref)
{
    $tbl_stats_item_property = Database::get_main_table(TABLE_STATISTIC_TRACK_E_ITEM_PROPERTY);
    $course_id = api_get_course_int_id(); //numeric
    $course_code = api_get_course_id(); //alphanumeric
    $item_property_id = api_get_item_property_id($course_code, $tool, $ref);
    $sql = "SELECT * FROM $tbl_stats_item_property
            WHERE item_property_id = $item_property_id AND course_id = $course_id
            ORDER BY lastedit_date DESC";
    $result = Database::query($sql);
    if ($result === false or $result === null) {
        $result = [];
    } else {
        $result = Database::store_result($result, 'ASSOC');
    }

    return $result;
}

/**
 * Gets item property data from tool of a course id.
 *
 * @param int    $course_id
 * @param string $tool       tool name, linked to 'rubrique' of the course tool_list (Warning: language sensitive !!)
 * @param int    $ref        id of the item itself, linked to key of every tool ('id', ...), "*" = all items of the tool
 * @param int    $session_id
 * @param int    $groupId
 *
 * @return array with all fields from c_item_property, empty array if not found or false if course could not be found
 */
function api_get_item_property_info($course_id, $tool, $ref, $session_id = 0, $groupId = 0)
{
    $courseInfo = api_get_course_info_by_id($course_id);

    if (empty($courseInfo)) {
        return false;
    }

    $tool = Database::escape_string($tool);
    $course_id = $courseInfo['real_id'];
    $ref = (int) $ref;
    $session_id = (int) $session_id;

    $sessionCondition = " session_id = $session_id";
    if (empty($session_id)) {
        $sessionCondition = ' (session_id = 0 OR session_id IS NULL) ';
    }

    // Definition of tables.
    $table = Database::get_course_table(TABLE_ITEM_PROPERTY);

    $sql = "SELECT * FROM $table
            WHERE
                c_id = $course_id AND
                tool = '$tool' AND
                ref = $ref AND
                $sessionCondition ";

    if (!empty($groupId)) {
        $groupId = (int) $groupId;
        $sql .= " AND to_group_id = $groupId ";
    }

    $rs = Database::query($sql);
    $row = [];
    if (Database::num_rows($rs) > 0) {
        $row = Database::fetch_array($rs, 'ASSOC');
    }

    return $row;
}

/**
 * Displays a combo box so the user can select his/her preferred language.
 *
 * @param string The desired name= value for the select
 * @param bool Whether we use the JQuery Chozen library or not
 * (in some cases, like the indexing language picker, it can alter the presentation)
 *
 * @deprecated
 *
 * @return string
 */
function api_get_languages_combo($name = 'language')
{
    $ret = '';
    $platformLanguage = api_get_setting('platformLanguage');

    // Retrieve a complete list of all the languages.
    $language_list = api_get_languages();

    if (count($language_list) < 2) {
        return $ret;
    }

    // The the current language of the user so that his/her language occurs as selected in the dropdown menu.
    if (isset($_SESSION['user_language_choice'])) {
        $default = $_SESSION['user_language_choice'];
    } else {
        $default = $platformLanguage;
    }

    $ret .= '<select name="'.$name.'" id="language_chosen" class="selectpicker show-tick form-control">';
    foreach ($language_list as $key => $value) {
        if ($key == $default) {
            $selected = ' selected="selected"';
        } else {
            $selected = '';
        }
        $ret .= sprintf('<option value=%s" %s>%s</option>', $key, $selected, $value);
    }
    $ret .= '</select>';

    return $ret;
}

/**
 * Displays a form (drop down menu) so the user can select his/her preferred language.
 * The form works with or without javascript.
 *
 * @param  bool Hide form if only one language available (defaults to false = show the box anyway)
 * @param bool $showAsButton
 *
 * @return string|null Display the box directly
 */
function api_display_language_form($hide_if_no_choice = false, $showAsButton = false)
{
    // Retrieve a complete list of all the languages.
    $language_list = api_get_languages();
    if (count($language_list['name']) <= 1 && $hide_if_no_choice) {
        return; //don't show any form
    }

    // The the current language of the user so that his/her language occurs as selected in the dropdown menu.
    if (isset($_SESSION['user_language_choice'])) {
        $user_selected_language = $_SESSION['user_language_choice'];
    }
    if (empty($user_selected_language)) {
        $user_selected_language = api_get_setting('platformLanguage');
    }

    $currentLanguageId = api_get_language_id($user_selected_language);
    $currentLanguageInfo = api_get_language_info($currentLanguageId);
    $countryCode = languageToCountryIsoCode($currentLanguageInfo['isocode']);
    $url = api_get_self();
    if ($showAsButton) {
        $html = '<div class="btn-group">
              <button type="button" class="btn btn-default dropdown-toggle" data-toggle="dropdown">
                <span class="flag-icon flag-icon-'.$countryCode.'"></span>
                '.$currentLanguageInfo['original_name'].'
                <span class="caret">
                </span>
              </button>';
    } else {
        $html = '
            <a href="'.$url.'" class="dropdown-toggle" data-toggle="dropdown" role="button">
                <span class="flag-icon flag-icon-'.$countryCode.'"></span> 
                '.$currentLanguageInfo['original_name'].'
                <span class="caret"></span>
            </a>
            ';
    }

    $html .= '<ul class="dropdown-menu" role="menu">';
    foreach ($language_list['all'] as $key => $data) {
        $urlLink = $url.'?language='.$data['english_name'];
        $html .= '<li><a href="'.$urlLink.'"><span class="flag-icon flag-icon-'.languageToCountryIsoCode($data['isocode']).'"></span> '.$data['original_name'].'</a></li>';
    }
    $html .= '</ul>';

    if ($showAsButton) {
        $html .= '</div>';
    }

    return $html;
}

/**
 * @param string $languageIsoCode
 *
 * @return string
 */
function languageToCountryIsoCode($languageIsoCode)
{
    $allow = api_get_configuration_value('language_flags_by_country');

    // @todo save in DB
    switch ($languageIsoCode) {
        case 'ko':
            $country = 'kr';
            break;
        case 'ja':
            $country = 'jp';
            break;
        case 'ca':
            $country = 'es';
            if ($allow) {
                $country = 'catalan';
            }
            break;
        case 'gl': // galego
            $country = 'es';
            if ($allow) {
                $country = 'galician';
            }
            break;
        case 'ka':
            $country = 'ge';
            break;
        case 'sl':
            $country = 'si';
            break;
        case 'eu': // Euskera
            $country = 'es';
            if ($allow) {
                $country = 'basque';
            }
            break;
        case 'cs':
            $country = 'cz';
            break;
        case 'el':
            $country = 'ae';
            break;
        case 'ar':
            $country = 'ae';
            break;
        case 'en_US':
        case 'en':
            $country = 'gb';
            break;
        case 'he':
            $country = 'il';
            break;
        case 'uk': // Ukraine
            $country = 'ua';
            break;
        case 'da':
            $country = 'dk';
            break;
        case 'pt-BR':
            $country = 'br';
            break;
        case 'qu':
            $country = 'pe';
            break;
        case 'sv':
            $country = 'se';
            break;
        case 'zh-TW':
        case 'zh':
            $country = 'cn';
            break;
        default:
            $country = $languageIsoCode;
            break;
    }
    $country = strtolower($country);

    return $country;
}

/**
 * Returns a list of all the languages that are made available by the admin.
 *
 * @return array An array with all languages. Structure of the array is
 *               array['name'] = An array with the name of every language
 *               array['folder'] = An array with the corresponding names of the language-folders in the filesystem
 */
function api_get_languages()
{
    $table = Database::get_main_table(TABLE_MAIN_LANGUAGE);
    $sql = "SELECT * FROM $table WHERE available='1' 
            ORDER BY original_name ASC";
    $result = Database::query($sql);
    $languages = [];
    while ($row = Database::fetch_array($result, 'ASSOC')) {
        $languages[$row['isocode']] = $row['original_name'];
    }

    return $languages;
}

/**
 * Returns a list of all the languages that are made available by the admin.
 *
 * @return array
 */
function api_get_languages_to_array()
{
    $tbl_language = Database::get_main_table(TABLE_MAIN_LANGUAGE);
    $sql = "SELECT * FROM $tbl_language WHERE available='1' ORDER BY original_name ASC";
    $result = Database::query($sql);
    $languages = [];
    while ($row = Database::fetch_array($result)) {
        $languages[$row['dokeos_folder']] = $row['original_name'];
    }

    return $languages;
}

/**
 * Returns the id (the database id) of a language.
 *
 * @param   string  language name (the corresponding name of the language-folder in the filesystem)
 *
 * @return int id of the language
 */
function api_get_language_id($language)
{
    $tbl_language = Database::get_main_table(TABLE_MAIN_LANGUAGE);
    if (empty($language)) {
        return null;
    }
    $language = Database::escape_string($language);
    $sql = "SELECT id FROM $tbl_language
            WHERE dokeos_folder = '$language' LIMIT 1";
    $result = Database::query($sql);
    $row = Database::fetch_array($result);

    return $row['id'];
}

/**
 * Get the language information by its id.
 *
 * @param int $languageId
 *
 * @throws Exception
 *
 * @return array
 */
function api_get_language_info($languageId)
{
    if (empty($languageId)) {
        return [];
    }

    $language = Database::getManager()
        ->find('ChamiloCoreBundle:Language', $languageId);

    if (!$language) {
        return [];
    }

    return [
        'id' => $language->getId(),
        'original_name' => $language->getOriginalName(),
        'english_name' => $language->getEnglishName(),
        'isocode' => $language->getIsocode(),
        'dokeos_folder' => $language->getDokeosFolder(),
        'available' => $language->getAvailable(),
        'parent_id' => $language->getParent() ? $language->getParent()->getId() : null,
    ];
}

/**
 * @param string $code
 *
 * @return \Chamilo\CoreBundle\Entity\Language
 */
function api_get_language_from_iso($code)
{
    $em = Database::getManager();
    $language = $em->getRepository('ChamiloCoreBundle:Language')->findOneBy(['isocode' => $code]);

    return $language;
}

/**
 * Returns the name of the visual (CSS) theme to be applied on the current page.
 * The returned name depends on the platform, course or user -wide settings.
 *
 * @return string The visual theme's name, it is the name of a folder inside web/css/themes
 */
function api_get_visual_theme()
{
    static $visual_theme;
    if (!isset($visual_theme)) {
        // Get style directly from DB
        $styleFromDatabase = api_get_settings_params_simple(
            [
                'variable = ? AND access_url = ?' => [
                    'stylesheets',
                    api_get_current_access_url_id(),
                ],
            ]
        );
        if ($styleFromDatabase) {
            $platform_theme = $styleFromDatabase['selected_value'];
        } else {
            $platform_theme = api_get_setting('stylesheets');
        }

        // Platform's theme.
        $visual_theme = $platform_theme;
        if (api_get_setting('user_selected_theme') == 'true') {
            $user_info = api_get_user_info();
            if (isset($user_info['theme'])) {
                $user_theme = $user_info['theme'];

                if (!empty($user_theme)) {
                    $visual_theme = $user_theme;
                    // User's theme.
                }
            }
        }

        $course_id = api_get_course_id();
        if (!empty($course_id)) {
            if (api_get_setting('allow_course_theme') == 'true') {
                $course_theme = api_get_course_setting('course_theme', $course_id);

                if (!empty($course_theme) && $course_theme != -1) {
                    if (!empty($course_theme)) {
                        // Course's theme.
                        $visual_theme = $course_theme;
                    }
                }

                $allow_lp_theme = api_get_course_setting('allow_learning_path_theme');
                if ($allow_lp_theme == 1) {
                    global $lp_theme_css, $lp_theme_config;
                    // These variables come from the file lp_controller.php.
                    if (!$lp_theme_config) {
                        if (!empty($lp_theme_css)) {
                            // LP's theme.
                            $visual_theme = $lp_theme_css;
                        }
                    }
                }
            }
        }

        if (empty($visual_theme)) {
            $visual_theme = 'chamilo';
        }

        global $lp_theme_log;
        if ($lp_theme_log) {
            $visual_theme = $platform_theme;
        }
    }

    return $visual_theme;
}

/**
 * Returns a list of CSS themes currently available in the CSS folder
 * The folder must have a default.css file.
 *
 * @param bool $getOnlyThemeFromVirtualInstance Used by the vchamilo plugin
 *
 * @return array list of themes directories from the css folder
 *               Note: Directory names (names of themes) in the file system should contain ASCII-characters only
 */
function api_get_themes($getOnlyThemeFromVirtualInstance = false)
{
    // This configuration value is set by the vchamilo plugin
    $virtualTheme = api_get_configuration_value('virtual_css_theme_folder');

    $readCssFolder = function ($dir) use ($virtualTheme) {
        $finder = new Finder();
        $themes = $finder->directories()->in($dir)->depth(0)->sortByName();
        $list = [];
        /** @var Symfony\Component\Finder\SplFileInfo $theme */
        foreach ($themes as $theme) {
            $folder = $theme->getFilename();
            // A theme folder is consider if there's a default.css file
            if (!file_exists($theme->getPathname().'/default.css')) {
                continue;
            }
            $name = ucwords(str_replace('_', ' ', $folder));
            if ($folder == $virtualTheme) {
                continue;
            }
            $list[$folder] = $name;
        }

        return $list;
    };

    $dir = api_get_path(SYS_CSS_PATH).'themes/';
    $list = $readCssFolder($dir);

    if (!empty($virtualTheme)) {
        $newList = $readCssFolder($dir.'/'.$virtualTheme);
        if ($getOnlyThemeFromVirtualInstance) {
            return $newList;
        }
        $list = $list + $newList;
        asort($list);
    }

    return $list;
}

/**
 * Find the largest sort value in a given user_course_category
 * This function is used when we are moving a course to a different category
 * and also when a user subscribes to courses (the new course is added at the end of the main category.
 *
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
 *
 * @param int $user_course_category the id of the user_course_category
 * @param int $user_id
 *
 * @return int the value of the highest sort of the user_course_category
 */
function api_max_sort_value($user_course_category, $user_id)
{
    $tbl_course_user = Database::get_main_table(TABLE_MAIN_COURSE_USER);
    $sql = "SELECT max(sort) as max_sort FROM $tbl_course_user
            WHERE
                user_id='".intval($user_id)."' AND
                relation_type<>".COURSE_RELATION_TYPE_RRHH." AND
                user_course_cat='".intval($user_course_category)."'";
    $result_max = Database::query($sql);
    if (Database::num_rows($result_max) == 1) {
        $row_max = Database::fetch_array($result_max);

        return $row_max['max_sort'];
    }

    return 0;
}

/**
 * Transforms a number of seconds in hh:mm:ss format.
 *
 * @author Julian Prud'homme
 *
 * @param int    $seconds      number of seconds
 * @param string $space
 * @param bool   $showSeconds
 * @param bool   $roundMinutes
 *
 * @return string the formatted time
 */
function api_time_to_hms($seconds, $space = ':', $showSeconds = true, $roundMinutes = false)
{
    // $seconds = -1 means that we have wrong data in the db.
    if ($seconds == -1) {
        return
            get_lang('Unknown').
            Display::return_icon(
                'info2.gif',
                get_lang('The datas about this user were registered when the calculation of time spent on the platform wasn\'t possible.'),
                ['align' => 'absmiddle', 'hspace' => '3px']
            );
    }

    // How many hours ?
    $hours = floor($seconds / 3600);

    // How many minutes ?
    $min = floor(($seconds - ($hours * 3600)) / 60);

    if ($roundMinutes) {
        if ($min >= 45) {
            $min = 45;
        }

        if ($min >= 30 && $min <= 44) {
            $min = 30;
        }

        if ($min >= 15 && $min <= 29) {
            $min = 15;
        }

        if ($min >= 0 && $min <= 14) {
            $min = 0;
        }
    }

    // How many seconds
    $sec = floor($seconds - ($hours * 3600) - ($min * 60));

    if ($hours < 10) {
        $hours = "0$hours";
    }

    if ($sec < 10) {
        $sec = "0$sec";
    }

    if ($min < 10) {
        $min = "0$min";
    }

    $seconds = '';
    if ($showSeconds) {
        $seconds = $space.$sec;
    }

    return $hours.$space.$min.$seconds;
}

/* FILE SYSTEM RELATED FUNCTIONS */

/**
 * Returns the permissions to be assigned to every newly created directory by the web-server.
 * The return value is based on the platform administrator's setting
 * "Administration > Configuration settings > Security > Permissions for new directories".
 *
 * @return int returns the permissions in the format "Owner-Group-Others, Read-Write-Execute", as an integer value
 */
function api_get_permissions_for_new_directories()
{
    static $permissions;
    if (!isset($permissions)) {
        $permissions = trim(api_get_setting('permissions_for_new_directories'));
        // The default value 0777 is according to that in the platform administration panel after fresh system installation.
        $permissions = octdec(!empty($permissions) ? $permissions : '0777');
    }

    return $permissions;
}

/**
 * Returns the permissions to be assigned to every newly created directory by the web-server.
 * The return value is based on the platform administrator's setting
 * "Administration > Configuration settings > Security > Permissions for new files".
 *
 * @return int returns the permissions in the format
 *             "Owner-Group-Others, Read-Write-Execute", as an integer value
 */
function api_get_permissions_for_new_files()
{
    static $permissions;
    if (!isset($permissions)) {
        $permissions = trim(api_get_setting('permissions_for_new_files'));
        // The default value 0666 is according to that in the platform
        // administration panel after fresh system installation.
        $permissions = octdec(!empty($permissions) ? $permissions : '0666');
    }

    return $permissions;
}

/**
 * Deletes a file, or a folder and its contents.
 *
 * @author      Aidan Lister <aidan@php.net>
 *
 * @version     1.0.3
 *
 * @param string $dirname Directory to delete
 * @param       bool     Deletes only the content or not
 * @param bool $strict if one folder/file fails stop the loop
 *
 * @return bool Returns TRUE on success, FALSE on failure
 *
 * @see http://aidanlister.com/2004/04/recursively-deleting-a-folder-in-php/
 *
 * @author      Yannick Warnier, adaptation for the Chamilo LMS, April, 2008
 * @author      Ivan Tcholakov, a sanity check about Directory class creation has been added, September, 2009
 */
function rmdirr($dirname, $delete_only_content_in_folder = false, $strict = false)
{
    $res = true;
    // A sanity check.
    if (!file_exists($dirname)) {
        return false;
    }
    $php_errormsg = '';
    // Simple delete for a file.
    if (is_file($dirname) || is_link($dirname)) {
        $res = unlink($dirname);
        if ($res === false) {
            error_log(__FILE__.' line '.__LINE__.': '.((bool) ini_get('track_errors') ? $php_errormsg : 'Error not recorded because track_errors is off in your php.ini'), 0);
        }

        return $res;
    }

    // Loop through the folder.
    $dir = dir($dirname);
    // A sanity check.
    $is_object_dir = is_object($dir);
    if ($is_object_dir) {
        while (false !== $entry = $dir->read()) {
            // Skip pointers.
            if ($entry == '.' || $entry == '..') {
                continue;
            }

            // Recurse.
            if ($strict) {
                $result = rmdirr("$dirname/$entry");
                if ($result == false) {
                    $res = false;
                    break;
                }
            } else {
                rmdirr("$dirname/$entry");
            }
        }
    }

    // Clean up.
    if ($is_object_dir) {
        $dir->close();
    }

    if ($delete_only_content_in_folder == false) {
        $res = rmdir($dirname);
        if ($res === false) {
            error_log(__FILE__.' line '.__LINE__.': '.((bool) ini_get('track_errors') ? $php_errormsg : 'error not recorded because track_errors is off in your php.ini'), 0);
        }
    }

    return $res;
}

// TODO: This function is to be simplified. File access modes to be implemented.
/**
 * function adapted from a php.net comment
 * copy recursively a folder.
 *
 * @param the source folder
 * @param the dest folder
 * @param an array of excluded file_name (without extension)
 * @param copied_files the returned array of copied files
 * @param string $source
 * @param string $dest
 */
function copyr($source, $dest, $exclude = [], $copied_files = [])
{
    if (empty($dest)) {
        return false;
    }
    // Simple copy for a file
    if (is_file($source)) {
        $path_info = pathinfo($source);
        if (!in_array($path_info['filename'], $exclude)) {
            copy($source, $dest);
        }

        return true;
    } elseif (!is_dir($source)) {
        //then source is not a dir nor a file, return
        return false;
    }

    // Make destination directory.
    if (!is_dir($dest)) {
        mkdir($dest, api_get_permissions_for_new_directories());
    }

    // Loop through the folder.
    $dir = dir($source);
    while (false !== $entry = $dir->read()) {
        // Skip pointers
        if ($entry == '.' || $entry == '..') {
            continue;
        }

        // Deep copy directories.
        if ($dest !== "$source/$entry") {
            $files = copyr("$source/$entry", "$dest/$entry", $exclude, $copied_files);
        }
    }
    // Clean up.
    $dir->close();

    return true;
}

/**
 * @todo: Using DIRECTORY_SEPARATOR is not recommended, this is an obsolete approach.
 * Documentation header to be added here.
 *
 * @param string $pathname
 * @param string $base_path_document
 * @param int    $session_id
 *
 * @return mixed True if directory already exists, false if a file already exists at
 *               the destination and null if everything goes according to plan
 */
function copy_folder_course_session(
    $pathname,
    $base_path_document,
    $session_id,
    $course_info,
    $document,
    $source_course_id
) {
    $table = Database::get_course_table(TABLE_DOCUMENT);
    $session_id = intval($session_id);
    $source_course_id = intval($source_course_id);

    // Check whether directory already exists.
    if (is_dir($pathname) || empty($pathname)) {
        return true;
    }

    // Ensure that a file with the same name does not already exist.
    if (is_file($pathname)) {
        trigger_error('copy_folder_course_session(): File exists', E_USER_WARNING);

        return false;
    }

    $course_id = $course_info['real_id'];
    $folders = explode(DIRECTORY_SEPARATOR, str_replace($base_path_document.DIRECTORY_SEPARATOR, '', $pathname));
    $new_pathname = $base_path_document;
    $path = '';

    foreach ($folders as $folder) {
        $new_pathname .= DIRECTORY_SEPARATOR.$folder;
        $path .= DIRECTORY_SEPARATOR.$folder;

        if (!file_exists($new_pathname)) {
            $path = Database::escape_string($path);

            $sql = "SELECT * FROM $table
                    WHERE
                        c_id = $source_course_id AND
                        path = '$path' AND
                        filetype = 'folder' AND
                        session_id = '$session_id'";
            $rs1 = Database::query($sql);
            $num_rows = Database::num_rows($rs1);

            if ($num_rows == 0) {
                mkdir($new_pathname, api_get_permissions_for_new_directories());

                // Insert new folder with destination session_id.
                $params = [
                    'c_id' => $course_id,
                    'path' => $path,
                    'comment' => $document->comment,
                    'title' => basename($new_pathname),
                    'filetype' => 'folder',
                    'size' => '0',
                    'session_id' => $session_id,
                ];
                $document_id = Database::insert($table, $params);
                if ($document_id) {
                    $sql = "UPDATE $table SET id = iid WHERE iid = $document_id";
                    Database::query($sql);

                    api_item_property_update(
                        $course_info,
                        TOOL_DOCUMENT,
                        $document_id,
                        'FolderCreated',
                        api_get_user_id(),
                        0,
                        0,
                        null,
                        null,
                        $session_id
                    );
                }
            }
        }
    } // en foreach
}

// TODO: chmodr() is a better name. Some corrections are needed. Documentation header to be added here.
/**
 * @param string $path
 */
function api_chmod_R($path, $filemode)
{
    if (!is_dir($path)) {
        return chmod($path, $filemode);
    }

    $handler = opendir($path);
    while ($file = readdir($handler)) {
        if ($file != '.' && $file != '..') {
            $fullpath = "$path/$file";
            if (!is_dir($fullpath)) {
                if (!chmod($fullpath, $filemode)) {
                    return false;
                }
            } else {
                if (!api_chmod_R($fullpath, $filemode)) {
                    return false;
                }
            }
        }
    }

    closedir($handler);

    return chmod($path, $filemode);
}

// TODO: Where the following function has been copy/pased from? There is no information about author and license. Style, coding conventions...
/**
 * Parse info file format. (e.g: file.info).
 *
 * Files should use an ini-like format to specify values.
 * White-space generally doesn't matter, except inside values.
 * e.g.
 *
 * @verbatim
 *   key = value
 *   key = "value"
 *   key = 'value'
 *   key = "multi-line
 *
 *   value"
 *   key = 'multi-line
 *
 *   value'
 *   key
 *   =
 *   'value'
 * @endverbatim
 *
 * Arrays are created using a GET-like syntax:
 *
 * @verbatim
 *   key[] = "numeric array"
 *   key[index] = "associative array"
 *   key[index][] = "nested numeric array"
 *   key[index][index] = "nested associative array"
 * @endverbatim
 *
 * PHP constants are substituted in, but only when used as the entire value:
 *
 * Comments should start with a semi-colon at the beginning of a line.
 *
 * This function is NOT for placing arbitrary module-specific settings. Use
 * variable_get() and variable_set() for that.
 *
 * Information stored in the module.info file:
 * - name: The real name of the module for display purposes.
 * - description: A brief description of the module.
 * - dependencies: An array of shortnames of other modules this module depends on.
 * - package: The name of the package of modules this module belongs to.
 *
 * Example of .info file:
 * <code>
 * @verbatim
 *   name = Forum
 *   description = Enables threaded discussions about general topics.
 *   dependencies[] = taxonomy
 *   dependencies[] = comment
 *   package = Core - optional
 *   version = VERSION
 * @endverbatim
 * </code>
 *
 * @param string $filename
 *                         The file we are parsing. Accepts file with relative or absolute path.
 *
 * @return
 *   The info array
 */
function api_parse_info_file($filename)
{
    $info = [];

    if (!file_exists($filename)) {
        return $info;
    }

    $data = file_get_contents($filename);
    if (preg_match_all('
        @^\s*                           # Start at the beginning of a line, ignoring leading whitespace
        ((?:
          [^=;\[\]]|                    # Key names cannot contain equal signs, semi-colons or square brackets,
          \[[^\[\]]*\]                  # unless they are balanced and not nested
        )+?)
        \s*=\s*                         # Key/value pairs are separated by equal signs (ignoring white-space)
        (?:
          ("(?:[^"]|(?<=\\\\)")*")|     # Double-quoted string, which may contain slash-escaped quotes/slashes
          (\'(?:[^\']|(?<=\\\\)\')*\')| # Single-quoted string, which may contain slash-escaped quotes/slashes
          ([^\r\n]*?)                   # Non-quoted string
        )\s*$                           # Stop at the next end of a line, ignoring trailing whitespace
        @msx', $data, $matches, PREG_SET_ORDER)) {
        $key = $value1 = $value2 = $value3 = '';
        foreach ($matches as $match) {
            // Fetch the key and value string.
            $i = 0;
            foreach (['key', 'value1', 'value2', 'value3'] as $var) {
                $$var = isset($match[++$i]) ? $match[$i] : '';
            }
            $value = stripslashes(substr($value1, 1, -1)).stripslashes(substr($value2, 1, -1)).$value3;

            // Parse array syntax.
            $keys = preg_split('/\]?\[/', rtrim($key, ']'));
            $last = array_pop($keys);
            $parent = &$info;

            // Create nested arrays.
            foreach ($keys as $key) {
                if ($key == '') {
                    $key = count($parent);
                }
                if (!isset($parent[$key]) || !is_array($parent[$key])) {
                    $parent[$key] = [];
                }
                $parent = &$parent[$key];
            }

            // Handle PHP constants.
            if (defined($value)) {
                $value = constant($value);
            }

            // Insert actual value.
            if ($last == '') {
                $last = count($parent);
            }
            $parent[$last] = $value;
        }
    }

    return $info;
}

/**
 * Gets Chamilo version from the configuration files.
 *
 * @return string A string of type "1.8.4", or an empty string if the version could not be found
 */
function api_get_version()
{
    return (string) api_get_configuration_value('system_version');
}

/**
 * Gets the software name (the name/brand of the Chamilo-based customized system).
 *
 * @return string
 */
function api_get_software_name()
{
    $name = api_get_configuration_value('software_name');
    if (!empty($name)) {
        return $name;
    } else {
        return 'Chamilo';
    }
}

/**
 * Checks whether status given in parameter exists in the platform.
 *
 * @param mixed the status (can be either int either string)
 *
 * @return bool if the status exists, else returns false
 */
function api_status_exists($status_asked)
{
    global $_status_list;

    return in_array($status_asked, $_status_list) ? true : isset($_status_list[$status_asked]);
}

/**
 * Checks whether status given in parameter exists in the platform. The function
 * returns the status ID or false if it does not exist, but given the fact there
 * is no "0" status, the return value can be checked against
 * if(api_status_key()) to know if it exists.
 *
 * @param   mixed   The status (can be either int or string)
 *
 * @return mixed Status ID if exists, false otherwise
 */
function api_status_key($status)
{
    global $_status_list;

    return isset($_status_list[$status]) ? $status : array_search($status, $_status_list);
}

/**
 * Gets the status langvars list.
 *
 * @return string[] the list of status with their translations
 */
function api_get_status_langvars()
{
    return [
        COURSEMANAGER => get_lang('Teacher', ''),
        SESSIONADMIN => get_lang('SessionsAdmin', ''),
        DRH => get_lang('Drh', ''),
        STUDENT => get_lang('Student', ''),
        ANONYMOUS => get_lang('Anonymous', ''),
        STUDENT_BOSS => get_lang('RoleStudentBoss', ''),
        INVITEE => get_lang('Invited'),
    ];
}

/**
 * The function that retrieves all the possible settings for a certain config setting.
 *
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
 */
function api_get_settings_options($var)
{
    $table_settings_options = Database::get_main_table(TABLE_MAIN_SETTINGS_OPTIONS);
    $var = Database::escape_string($var);
    $sql = "SELECT * FROM $table_settings_options
            WHERE variable = '$var'
            ORDER BY id";
    $result = Database::query($sql);
    $settings_options_array = [];
    while ($row = Database::fetch_array($result, 'ASSOC')) {
        $settings_options_array[] = $row;
    }

    return $settings_options_array;
}

/**
 * @param array $params
 */
function api_set_setting_option($params)
{
    $table = Database::get_main_table(TABLE_MAIN_SETTINGS_OPTIONS);
    if (empty($params['id'])) {
        Database::insert($table, $params);
    } else {
        Database::update($table, $params, ['id = ? ' => $params['id']]);
    }
}

/**
 * @param array $params
 */
function api_set_setting_simple($params)
{
    $table = Database::get_main_table(TABLE_MAIN_SETTINGS_CURRENT);
    $url_id = api_get_current_access_url_id();

    if (empty($params['id'])) {
        $params['access_url'] = $url_id;
        Database::insert($table, $params);
    } else {
        Database::update($table, $params, ['id = ? ' => [$params['id']]]);
    }
}

/**
 * @param int $id
 */
function api_delete_setting_option($id)
{
    $table = Database::get_main_table(TABLE_MAIN_SETTINGS_OPTIONS);
    if (!empty($id)) {
        Database::delete($table, ['id = ? ' => $id]);
    }
}

/**
 * Sets a platform configuration setting to a given value.
 *
 * @param string    The variable we want to update
 * @param string    The value we want to record
 * @param string    The sub-variable if any (in most cases, this will remain null)
 * @param string    The category if any (in most cases, this will remain null)
 * @param int       The access_url for which this parameter is valid
 * @param string $cat
 *
 * @return bool|null
 */
function api_set_setting($var, $value, $subvar = null, $cat = null, $access_url = 1)
{
    if (empty($var)) {
        return false;
    }
    $t_settings = Database::get_main_table(TABLE_MAIN_SETTINGS_CURRENT);
    $var = Database::escape_string($var);
    $value = Database::escape_string($value);
    $access_url = (int) $access_url;
    if (empty($access_url)) {
        $access_url = 1;
    }
    $select = "SELECT id FROM $t_settings WHERE variable = '$var' ";
    if (!empty($subvar)) {
        $subvar = Database::escape_string($subvar);
        $select .= " AND subkey = '$subvar'";
    }
    if (!empty($cat)) {
        $cat = Database::escape_string($cat);
        $select .= " AND category = '$cat'";
    }
    if ($access_url > 1) {
        $select .= " AND access_url = $access_url";
    } else {
        $select .= " AND access_url = 1 ";
    }

    $res = Database::query($select);
    if (Database::num_rows($res) > 0) {
        // Found item for this access_url.
        $row = Database::fetch_array($res);
        $sql = "UPDATE $t_settings SET selected_value = '$value'
                WHERE id = ".$row['id'];
        Database::query($sql);
    } else {
        // Item not found for this access_url, we have to check if it exist with access_url = 1
        $select = "SELECT * FROM $t_settings
                   WHERE variable = '$var' AND access_url = 1 ";
        // Just in case
        if ($access_url == 1) {
            if (!empty($subvar)) {
                $select .= " AND subkey = '$subvar'";
            }
            if (!empty($cat)) {
                $select .= " AND category = '$cat'";
            }
            $res = Database::query($select);
            if (Database::num_rows($res) > 0) {
                // We have a setting for access_url 1, but none for the current one, so create one.
                $row = Database::fetch_array($res);
                $insert = "INSERT INTO $t_settings (variable, subkey, type,category, selected_value, title, comment, scope, subkeytext, access_url)
                        VALUES
                        ('".$row['variable']."',".(!empty($row['subkey']) ? "'".$row['subkey']."'" : "NULL").",".
                    "'".$row['type']."','".$row['category']."',".
                    "'$value','".$row['title']."',".
                    "".(!empty($row['comment']) ? "'".$row['comment']."'" : "NULL").",".(!empty($row['scope']) ? "'".$row['scope']."'" : "NULL").",".
                    "".(!empty($row['subkeytext']) ? "'".$row['subkeytext']."'" : "NULL").",$access_url)";
                Database::query($insert);
            } else {
                // Such a setting does not exist.
                //error_log(__FILE__.':'.__LINE__.': Attempting to update setting '.$var.' ('.$subvar.') which does not exist at all', 0);
            }
        } else {
            // Other access url.
            if (!empty($subvar)) {
                $select .= " AND subkey = '$subvar'";
            }
            if (!empty($cat)) {
                $select .= " AND category = '$cat'";
            }
            $res = Database::query($select);

            if (Database::num_rows($res) > 0) {
                // We have a setting for access_url 1, but none for the current one, so create one.
                $row = Database::fetch_array($res);
                if ($row['access_url_changeable'] == 1) {
                    $insert = "INSERT INTO $t_settings (variable,subkey, type,category, selected_value,title, comment,scope, subkeytext,access_url, access_url_changeable) VALUES
                            ('".$row['variable']."',".
                        (!empty($row['subkey']) ? "'".$row['subkey']."'" : "NULL").",".
                        "'".$row['type']."','".$row['category']."',".
                        "'$value','".$row['title']."',".
                        "".(!empty($row['comment']) ? "'".$row['comment']."'" : "NULL").",".
                        (!empty($row['scope']) ? "'".$row['scope']."'" : "NULL").",".
                        "".(!empty($row['subkeytext']) ? "'".$row['subkeytext']."'" : "NULL").",$access_url,".$row['access_url_changeable'].")";
                    Database::query($insert);
                }
            } else { // Such a setting does not exist.
                //error_log(__FILE__.':'.__LINE__.': Attempting to update setting '.$var.' ('.$subvar.') which does not exist at all. The access_url is: '.$access_url.' ',0);
            }
        }
    }
}

/**
 * Sets a whole category of settings to one specific value.
 *
 * @param string    Category
 * @param string    Value
 * @param int       Access URL. Optional. Defaults to 1
 * @param array     Optional array of filters on field type
 * @param string $category
 * @param string $value
 *
 * @return bool
 */
function api_set_settings_category($category, $value = null, $access_url = 1, $fieldtype = [])
{
    if (empty($category)) {
        return false;
    }
    $category = Database::escape_string($category);
    $t_s = Database::get_main_table(TABLE_MAIN_SETTINGS_CURRENT);
    $access_url = (int) $access_url;
    if (empty($access_url)) {
        $access_url = 1;
    }
    if (isset($value)) {
        $value = Database::escape_string($value);
        $sql = "UPDATE $t_s SET selected_value = '$value'
                WHERE category = '$category' AND access_url = $access_url";
        if (is_array($fieldtype) && count($fieldtype) > 0) {
            $sql .= " AND ( ";
            $i = 0;
            foreach ($fieldtype as $type) {
                if ($i > 0) {
                    $sql .= ' OR ';
                }
                $type = Database::escape_string($type);
                $sql .= " type='".$type."' ";
                $i++;
            }
            $sql .= ")";
        }
        $res = Database::query($sql);

        return $res !== false;
    } else {
        $sql = "UPDATE $t_s SET selected_value = NULL
                WHERE category = '$category' AND access_url = $access_url";
        if (is_array($fieldtype) && count($fieldtype) > 0) {
            $sql .= " AND ( ";
            $i = 0;
            foreach ($fieldtype as $type) {
                if ($i > 0) {
                    $sql .= ' OR ';
                }
                $type = Database::escape_string($type);
                $sql .= " type='".$type."' ";
                $i++;
            }
            $sql .= ")";
        }
        $res = Database::query($sql);

        return $res !== false;
    }
}

/**
 * Gets all available access urls in an array (as in the database).
 *
 * @return array An array of database records
 */
function api_get_access_urls($from = 0, $to = 1000000, $order = 'url', $direction = 'ASC')
{
    $table = Database::get_main_table(TABLE_MAIN_ACCESS_URL);
    $from = (int) $from;
    $to = (int) $to;
    $order = Database::escape_string($order, null, false);
    $direction = Database::escape_string($direction, null, false);
    $sql = "SELECT id, url, description, active, created_by, tms
            FROM $table
            ORDER BY $order $direction
            LIMIT $to OFFSET $from";
    $res = Database::query($sql);

    return Database::store_result($res);
}

/**
 * Gets the access url info in an array.
 *
 * @param int  $id            Id of the access url
 * @param bool $returnDefault Set to false if you want the real URL if URL 1 is still 'http://localhost/'
 *
 * @return array All the info (url, description, active, created_by, tms)
 *               from the access_url table
 *
 * @author Julio Montoya
 */
function api_get_access_url($id, $returnDefault = true)
{
    static $staticResult;
    $id = (int) $id;

    if (isset($staticResult[$id])) {
        $result = $staticResult[$id];
    } else {
        // Calling the Database:: library dont work this is handmade.
        $table_access_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL);
        $sql = "SELECT url, description, active, created_by, tms
                FROM $table_access_url WHERE id = '$id' ";
        $res = Database::query($sql);
        $result = @Database::fetch_array($res);
        $staticResult[$id] = $result;
    }

    // If the result url is 'http://localhost/' (the default) and the root_web
    // (=current url) is different, and the $id is = 1 (which might mean
    // api_get_current_access_url_id() returned 1 by default), then return the
    // root_web setting instead of the current URL
    // This is provided as an option to avoid breaking the storage of URL-specific
    // homepages in home/localhost/
    if ($id === 1 && $returnDefault === false) {
        $currentUrl = api_get_current_access_url_id();
        // only do this if we are on the main URL (=1), otherwise we could get
        // information on another URL instead of the one asked as parameter
        if ($currentUrl === 1) {
            $rootWeb = api_get_path(WEB_PATH);
            $default = 'http://localhost/';
            if ($result['url'] === $default && $rootWeb != $default) {
                $result['url'] = $rootWeb;
            }
        }
    }

    return $result;
}

/**
 * Gets all the current settings for a specific access url.
 *
 * @param string    The category, if any, that we want to get
 * @param string    Whether we want a simple list (display a category) or
 * a grouped list (group by variable as in settings.php default). Values: 'list' or 'group'
 * @param int       Access URL's ID. Optional. Uses 1 by default, which is the unique URL
 *
 * @return array Array of database results for the current settings of the current access URL
 */
function &api_get_settings($cat = null, $ordering = 'list', $access_url = 1, $url_changeable = 0)
{
    $table = Database::get_main_table(TABLE_MAIN_SETTINGS_CURRENT);
    $access_url = (int) $access_url;
    $where_condition = '';
    if ($url_changeable == 1) {
        $where_condition = " AND access_url_changeable= '1' ";
    }
    if (empty($access_url) || $access_url == -1) {
        $access_url = 1;
    }
    $sql = "SELECT * FROM $table
            WHERE access_url = $access_url  $where_condition ";

    if (!empty($cat)) {
        $cat = Database::escape_string($cat);
        $sql .= " AND category='$cat' ";
    }
    if ($ordering == 'group') {
        $sql .= " ORDER BY id ASC";
    } else {
        $sql .= " ORDER BY 1,2 ASC";
    }
    $result = Database::query($sql);
    if ($result === null) {
        return [];
    }
    $result = Database::store_result($result, 'ASSOC');

    return $result;
}

/**
 * @param string $value       The value we want to record
 * @param string $variable    The variable name we want to insert
 * @param string $subKey      The subkey for the variable we want to insert
 * @param string $type        The type for the variable we want to insert
 * @param string $category    The category for the variable we want to insert
 * @param string $title       The title
 * @param string $comment     The comment
 * @param string $scope       The scope
 * @param string $subKeyText  The subkey text
 * @param int    $accessUrlId The access_url for which this parameter is valid
 * @param int    $visibility  The changeability of this setting for non-master urls
 *
 * @return int The setting ID
 */
function api_add_setting(
    $value,
    $variable,
    $subKey = '',
    $type = 'textfield',
    $category = '',
    $title = '',
    $comment = '',
    $scope = '',
    $subKeyText = '',
    $accessUrlId = 1,
    $visibility = 0
) {
    $em = Database::getManager();
    $settingRepo = $em->getRepository('ChamiloCoreBundle:SettingsCurrent');
    $accessUrlId = (int) $accessUrlId ?: 1;

    if (is_array($value)) {
        $value = serialize($value);
    } else {
        $value = trim($value);
    }

    $criteria = ['variable' => $variable, 'url' => $accessUrlId];

    if (!empty($subKey)) {
        $criteria['subkey'] = $subKey;
    }

    // Check if this variable doesn't exist already
    /** @var SettingsCurrent $setting */
    $setting = $settingRepo->findOneBy($criteria);

    if ($setting) {
        $setting->setSelectedValue($value);

        $em->persist($setting);
        $em->flush();

        return $setting->getId();
    }

    // Item not found for this access_url, we have to check if the whole thing is missing
    // (in which case we ignore the insert) or if there *is* a record but just for access_url = 1
    $setting = new SettingsCurrent();
    $url = api_get_url_entity();

    $setting
        ->setVariable($variable)
        ->setSelectedValue($value)
        ->setType($type)
        ->setCategory($category)
        ->setSubkey($subKey)
        ->setTitle($title)
        ->setComment($comment)
        ->setScope($scope)
        ->setSubkeytext($subKeyText)
        ->setUrl(api_get_url_entity())
        ->setAccessUrlChangeable($visibility);

    $em->persist($setting);
    $em->flush();

    return $setting->getId();
}

/**
 * Checks wether a user can or can't view the contents of a course.
 *
 * @deprecated use CourseManager::is_user_subscribed_in_course
 *
 * @param int $userid User id or NULL to get it from $_SESSION
 * @param int $cid    course id to check whether the user is allowed
 *
 * @return bool
 */
function api_is_course_visible_for_user($userid = null, $cid = null)
{
    if ($userid === null) {
        $userid = api_get_user_id();
    }
    if (empty($userid) || strval(intval($userid)) != $userid) {
        if (api_is_anonymous()) {
            $userid = api_get_anonymous_id();
        } else {
            return false;
        }
    }
    $cid = Database::escape_string($cid);

    $courseInfo = api_get_course_info($cid);
    $courseId = $courseInfo['real_id'];
    $is_platformAdmin = api_is_platform_admin();

    $course_table = Database::get_main_table(TABLE_MAIN_COURSE);
    $course_cat_table = Database::get_main_table(TABLE_MAIN_CATEGORY);

    $sql = "SELECT
                $course_table.category_code,
                $course_table.visibility,
                $course_table.code,
                $course_cat_table.code
            FROM $course_table
            LEFT JOIN $course_cat_table
                ON $course_table.category_code = $course_cat_table.code
            WHERE
                $course_table.code = '$cid'
            LIMIT 1";

    $result = Database::query($sql);

    if (Database::num_rows($result) > 0) {
        $visibility = Database::fetch_array($result);
        $visibility = $visibility['visibility'];
    } else {
        $visibility = 0;
    }
    // Shortcut permissions in case the visibility is "open to the world".
    if ($visibility === COURSE_VISIBILITY_OPEN_WORLD) {
        return true;
    }

    $tbl_course_user = Database::get_main_table(TABLE_MAIN_COURSE_USER);

    $sql = "SELECT
                is_tutor, status
            FROM $tbl_course_user
            WHERE
                user_id  = '$userid' AND
                relation_type <> '".COURSE_RELATION_TYPE_RRHH."' AND
                c_id = $courseId
            LIMIT 1";

    $result = Database::query($sql);

    if (Database::num_rows($result) > 0) {
        // This user has got a recorded state for this course.
        $cuData = Database::fetch_array($result);
        $is_courseMember = true;
        $is_courseAdmin = ($cuData['status'] == 1);
    }

    if (!$is_courseAdmin) {
        // This user has no status related to this course.
        // Is it the session coach or the session admin?
        $tbl_session = Database::get_main_table(TABLE_MAIN_SESSION);
        $tbl_session_course = Database::get_main_table(TABLE_MAIN_SESSION_COURSE);
        $tbl_session_course_user = Database::get_main_table(TABLE_MAIN_SESSION_COURSE_USER);

        $sql = "SELECT
                    session.id_coach, session_admin_id, session.id
                FROM
                    $tbl_session as session
                INNER JOIN $tbl_session_course
                    ON session_rel_course.session_id = session.id
                    AND session_rel_course.c_id = '$courseId'
                LIMIT 1";

        $result = Database::query($sql);
        $row = Database::store_result($result);

        if ($row[0]['id_coach'] == $userid) {
            $is_courseMember = true;
            $is_courseAdmin = false;
        } elseif ($row[0]['session_admin_id'] == $userid) {
            $is_courseMember = false;
            $is_courseAdmin = false;
        } else {
            // Check if the current user is the course coach.
            $sql = "SELECT 1
                    FROM $tbl_session_course
                    WHERE session_rel_course.c_id = '$courseId'
                    AND session_rel_course.id_coach = '$userid'
                    LIMIT 1";

            $result = Database::query($sql);

            //if ($row = Database::fetch_array($result)) {
            if (Database::num_rows($result) > 0) {
                $is_courseMember = true;
                $tbl_user = Database::get_main_table(TABLE_MAIN_USER);

                $sql = "SELECT status FROM $tbl_user
                        WHERE user_id = $userid
                        LIMIT 1";

                $result = Database::query($sql);

                if (Database::result($result, 0, 0) == 1) {
                    $is_courseAdmin = true;
                } else {
                    $is_courseAdmin = false;
                }
            } else {
                // Check if the user is a student is this session.
                $sql = "SELECT  id
                        FROM $tbl_session_course_user
                        WHERE
                            user_id  = '$userid' AND
                            c_id = '$courseId'
                        LIMIT 1";

                if (Database::num_rows($result) > 0) {
                    // This user haa got a recorded state for this course.
                    while ($row = Database::fetch_array($result)) {
                        $is_courseMember = true;
                        $is_courseAdmin = false;
                    }
                }
            }
        }
    }

    switch ($visibility) {
        case COURSE_VISIBILITY_OPEN_WORLD:
            return true;
        case COURSE_VISIBILITY_OPEN_PLATFORM:
            return isset($userid);
        case COURSE_VISIBILITY_REGISTERED:
        case COURSE_VISIBILITY_CLOSED:
            return $is_platformAdmin || $is_courseMember || $is_courseAdmin;
        case COURSE_VISIBILITY_HIDDEN:
            return $is_platformAdmin;
    }

    return false;
}

/**
 * Returns whether an element (forum, message, survey ...) belongs to a session or not.
 *
 * @param string the tool of the element
 * @param int the element id in database
 * @param int the session_id to compare with element session id
 *
 * @return bool true if the element is in the session, false else
 */
function api_is_element_in_the_session($tool, $element_id, $session_id = null)
{
    if (is_null($session_id)) {
        $session_id = api_get_session_id();
    }

    $element_id = (int) $element_id;

    if (empty($element_id)) {
        return false;
    }

    // Get information to build query depending of the tool.
    switch ($tool) {
        case TOOL_SURVEY:
            $table_tool = Database::get_course_table(TABLE_SURVEY);
            $key_field = 'survey_id';
            break;
        case TOOL_ANNOUNCEMENT:
            $table_tool = Database::get_course_table(TABLE_ANNOUNCEMENT);
            $key_field = 'id';
            break;
        case TOOL_AGENDA:
            $table_tool = Database::get_course_table(TABLE_AGENDA);
            $key_field = 'id';
            break;
        case TOOL_GROUP:
            $table_tool = Database::get_course_table(TABLE_GROUP);
            $key_field = 'id';
            break;
        default:
            return false;
    }
    $course_id = api_get_course_int_id();

    $sql = "SELECT session_id FROM $table_tool
            WHERE c_id = $course_id AND $key_field =  ".$element_id;
    $rs = Database::query($sql);
    if ($element_session_id = Database::result($rs, 0, 0)) {
        if ($element_session_id == intval($session_id)) {
            // The element belongs to the session.
            return true;
        }
    }

    return false;
}

/**
 * Replaces "forbidden" characters in a filename string.
 *
 * @param string $filename
 * @param bool   $treat_spaces_as_hyphens
 *
 * @return string
 */
function api_replace_dangerous_char($filename, $treat_spaces_as_hyphens = true)
{
    // Some non-properly encoded file names can cause the whole file to be
    // skipped when uploaded. Avoid this by detecting the encoding and
    // converting to UTF-8, setting the source as ASCII (a reasonably
    // limited characters set) if nothing could be found (BT#
    $encoding = api_detect_encoding($filename);
    if (empty($encoding)) {
        $encoding = 'ASCII';
        if (!api_is_valid_ascii($filename)) {
            // try iconv and try non standard ASCII a.k.a CP437
            // see BT#15022
            if (function_exists('iconv')) {
                $result = iconv('CP437', 'UTF-8', $filename);
                if (api_is_valid_utf8($result)) {
                    $filename = $result;
                    $encoding = 'UTF-8';
                }
            }
        }
    }

    $filename = api_to_system_encoding($filename, $encoding);

    $url = URLify::filter(
        $filename,
        250,
        '',
        true,
        true,
        false,
        false,
        $treat_spaces_as_hyphens
    );

    return $url;
}

/**
 * Fixes the $_SERVER['REQUEST_URI'] that is empty in IIS6.
 *
 * @author Ivan Tcholakov, 28-JUN-2006.
 */
function api_request_uri()
{
    if (!empty($_SERVER['REQUEST_URI'])) {
        return $_SERVER['REQUEST_URI'];
    }
    $uri = $_SERVER['SCRIPT_NAME'];
    if (!empty($_SERVER['QUERY_STRING'])) {
        $uri .= '?'.$_SERVER['QUERY_STRING'];
    }
    $_SERVER['REQUEST_URI'] = $uri;

    return $uri;
}

/** Gets the current access_url id of the Chamilo Platform
 * @author Julio Montoya <gugli100@gmail.com>
 *
 * @return int access_url_id of the current Chamilo Installation
 */
function api_get_current_access_url_id()
{
    if (api_get_multiple_access_url() === false) {
        return 1;
    }

    static $id;
    if (!empty($id)) {
        return $id;
    }

    $table = Database::get_main_table(TABLE_MAIN_ACCESS_URL);
    $path = Database::escape_string(api_get_path(WEB_PATH));
    $sql = "SELECT id FROM $table WHERE url = '".$path."'";
    $result = Database::query($sql);
    if (Database::num_rows($result) > 0) {
        $id = Database::result($result, 0, 0);
        if ($id === false) {
            return -1;
        }

        return (int) $id;
    }

    $id = 1;

    //if the url in WEB_PATH was not found, it can only mean that there is
    // either a configuration problem or the first URL has not been defined yet
    // (by default it is http://localhost/). Thus the more sensible thing we can
    // do is return 1 (the main URL) as the user cannot hack this value anyway
    return 1;
}

/**
 * Gets the registered urls from a given user id.
 *
 * @author Julio Montoya <gugli100@gmail.com>
 *
 * @param int $user_id
 *
 * @return array
 */
function api_get_access_url_from_user($user_id)
{
    $user_id = (int) $user_id;
    $table_url_rel_user = Database::get_main_table(TABLE_MAIN_ACCESS_URL_REL_USER);
    $table_url = Database::get_main_table(TABLE_MAIN_ACCESS_URL);
    $sql = "SELECT access_url_id
            FROM $table_url_rel_user url_rel_user
            INNER JOIN $table_url u
            ON (url_rel_user.access_url_id = u.id)
            WHERE user_id = ".$user_id;
    $result = Database::query($sql);
    $list = [];
    while ($row = Database::fetch_array($result, 'ASSOC')) {
        $list[] = $row['access_url_id'];
    }

    return $list;
}

/**
 * Gets the status of a user in a course.
 *
 * @param int $user_id
 * @param int $courseId
 *
 * @return int user status
 */
function api_get_status_of_user_in_course($user_id, $courseId)
{
    $tbl_rel_course_user = Database::get_main_table(TABLE_MAIN_COURSE_USER);
    if (!empty($user_id) && !empty($courseId)) {
        $user_id = intval($user_id);
        $courseId = intval($courseId);
        $sql = 'SELECT status
                FROM '.$tbl_rel_course_user.'
                WHERE user_id='.$user_id.' AND c_id = '.$courseId;
        $result = Database::query($sql);
        $row_status = Database::fetch_array($result, 'ASSOC');

        return $row_status['status'];
    } else {
        return 0;
    }
}

/**
 * Checks whether the curent user is in a group or not.
 *
 * @param string        The group id - optional (takes it from session if not given)
 * @param string        The course code - optional (no additional check by course if course code is not given)
 *
 * @return bool
 *
 * @author Ivan Tcholakov
 */
function api_is_in_group($groupIdParam = null, $courseCodeParam = null)
{
    if (!empty($courseCodeParam)) {
        $courseCode = api_get_course_id();
        if (!empty($courseCode)) {
            if ($courseCodeParam != $courseCode) {
                return false;
            }
        } else {
            return false;
        }
    }

    $groupId = api_get_group_id();

    if (isset($groupId) && $groupId != '') {
        if (!empty($groupIdParam)) {
            return $groupIdParam == $groupId;
        } else {
            return true;
        }
    }

    return false;
}

/**
 * Checks whether a secret key is valid.
 *
 * @param string $original_key_secret - secret key from (webservice) client
 * @param string $security_key        - security key from Chamilo
 *
 * @return bool - true if secret key is valid, false otherwise
 */
function api_is_valid_secret_key($original_key_secret, $security_key)
{
    return $original_key_secret == sha1($security_key);
}

/**
 * Checks whether a user is into course.
 *
 * @param int $course_id - the course id
 * @param int $user_id   - the user id
 *
 * @return bool
 */
function api_is_user_of_course($course_id, $user_id)
{
    $tbl_course_rel_user = Database::get_main_table(TABLE_MAIN_COURSE_USER);
    $sql = 'SELECT user_id FROM '.$tbl_course_rel_user.'
            WHERE
                c_id ="'.intval($course_id).'" AND
                user_id = "'.intval($user_id).'" AND
                relation_type <> '.COURSE_RELATION_TYPE_RRHH.' ';
    $result = Database::query($sql);

    return Database::num_rows($result) == 1;
}

/**
 * Checks whether the server's operating system is Windows (TM).
 *
 * @return bool - true if the operating system is Windows, false otherwise
 */
function api_is_windows_os()
{
    if (function_exists('php_uname')) {
        // php_uname() exists as of PHP 4.0.2, according to the documentation.
        // We expect that this function will always work for Chamilo 1.8.x.
        $os = php_uname();
    }
    // The following methods are not needed, but let them stay, just in case.
    elseif (isset($_ENV['OS'])) {
        // Sometimes $_ENV['OS'] may not be present (bugs?)
        $os = $_ENV['OS'];
    } elseif (defined('PHP_OS')) {
        // PHP_OS means on which OS PHP was compiled, this is why
        // using PHP_OS is the last choice for detection.
        $os = PHP_OS;
    } else {
        return false;
    }

    return strtolower(substr((string) $os, 0, 3)) == 'win';
}

/**
 * This function informs whether the sent request is XMLHttpRequest.
 */
function api_is_xml_http_request()
{
    return isset($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest';
}

/**
 * This wrapper function has been implemented for avoiding some known problems about the function getimagesize().
 *
 * @see http://php.net/manual/en/function.getimagesize.php
 * @see http://www.dokeos.com/forum/viewtopic.php?t=12345
 * @see http://www.dokeos.com/forum/viewtopic.php?t=16355
 *
 * @return int
 */
function api_getimagesize($path)
{
    $image = new Image($path);

    return $image->get_image_size();
}

/**
 * This function resizes an image, with preserving its proportions (or aspect ratio).
 *
 * @author Ivan Tcholakov, MAY-2009.
 *
 * @param int $image         System path or URL of the image
 * @param int $target_width  Targeted width
 * @param int $target_height Targeted height
 *
 * @return array Calculated new width and height
 */
function api_resize_image($image, $target_width, $target_height)
{
    $image_properties = api_getimagesize($image);

    return api_calculate_image_size(
        $image_properties['width'],
        $image_properties['height'],
        $target_width,
        $target_height
    );
}

/**
 * This function calculates new image size, with preserving image's proportions (or aspect ratio).
 *
 * @author Ivan Tcholakov, MAY-2009.
 * @author The initial idea has been taken from code by Patrick Cool, MAY-2004.
 *
 * @param int $image_width   Initial width
 * @param int $image_height  Initial height
 * @param int $target_width  Targeted width
 * @param int $target_height Targeted height
 *
 * @return array Calculated new width and height
 */
function api_calculate_image_size(
    $image_width,
    $image_height,
    $target_width,
    $target_height
) {
    // Only maths is here.
    $result = ['width' => $image_width, 'height' => $image_height];
    if ($image_width <= 0 || $image_height <= 0) {
        return $result;
    }
    $resize_factor_width = $target_width / $image_width;
    $resize_factor_height = $target_height / $image_height;
    $delta_width = $target_width - $image_width * $resize_factor_height;
    $delta_height = $target_height - $image_height * $resize_factor_width;
    if ($delta_width > $delta_height) {
        $result['width'] = ceil($image_width * $resize_factor_height);
        $result['height'] = ceil($image_height * $resize_factor_height);
    } elseif ($delta_width < $delta_height) {
        $result['width'] = ceil($image_width * $resize_factor_width);
        $result['height'] = ceil($image_height * $resize_factor_width);
    } else {
        $result['width'] = ceil($target_width);
        $result['height'] = ceil($target_height);
    }

    return $result;
}

/**
 * Returns a list of Chamilo's tools or
 * checks whether a given identificator is a valid Chamilo's tool.
 *
 * @author Isaac flores paz
 *
 * @param string The tool name to filter
 *
 * @return mixed Filtered string or array
 */
function api_get_tools_lists($my_tool = null)
{
    $tools_list = [
        TOOL_DOCUMENT,
        TOOL_THUMBNAIL,
        TOOL_HOTPOTATOES,
        TOOL_CALENDAR_EVENT,
        TOOL_LINK,
        TOOL_COURSE_DESCRIPTION,
        TOOL_SEARCH,
        TOOL_LEARNPATH,
        TOOL_ANNOUNCEMENT,
        TOOL_FORUM,
        TOOL_THREAD,
        TOOL_POST,
        TOOL_DROPBOX,
        TOOL_QUIZ,
        TOOL_USER,
        TOOL_GROUP,
        TOOL_BLOGS,
        TOOL_CHAT,
        TOOL_STUDENTPUBLICATION,
        TOOL_TRACKING,
        TOOL_HOMEPAGE_LINK,
        TOOL_COURSE_SETTING,
        TOOL_BACKUP,
        TOOL_COPY_COURSE_CONTENT,
        TOOL_RECYCLE_COURSE,
        TOOL_COURSE_HOMEPAGE,
        TOOL_COURSE_RIGHTS_OVERVIEW,
        TOOL_UPLOAD,
        TOOL_COURSE_MAINTENANCE,
        TOOL_SURVEY,
        TOOL_WIKI,
        TOOL_GLOSSARY,
        TOOL_GRADEBOOK,
        TOOL_NOTEBOOK,
        TOOL_ATTENDANCE,
        TOOL_COURSE_PROGRESS,
    ];
    if (empty($my_tool)) {
        return $tools_list;
    }

    return in_array($my_tool, $tools_list) ? $my_tool : '';
}

/**
 * Checks whether we already approved the last version term and condition.
 *
 * @param int user id
 *
 * @return bool true if we pass false otherwise
 */
function api_check_term_condition($userId)
{
    if (api_get_setting('allow_terms_conditions') === 'true') {
        // Check if exists terms and conditions
        if (LegalManager::count() == 0) {
            return true;
        }

        $extraFieldValue = new ExtraFieldValue('user');
        $data = $extraFieldValue->get_values_by_handler_and_field_variable(
            $userId,
            'legal_accept'
        );

        if (!empty($data) && isset($data['value']) && !empty($data['value'])) {
            $result = $data['value'];
            $user_conditions = explode(':', $result);
            $version = $user_conditions[0];
            $langId = $user_conditions[1];
            $realVersion = LegalManager::get_last_version($langId);

            return $version >= $realVersion;
        }

        return false;
    }

    return false;
}

/**
 * Gets all information of a tool into course.
 *
 * @param int The tool id
 *
 * @return array
 */
function api_get_tool_information_by_name($name)
{
    $t_tool = Database::get_course_table(TABLE_TOOL_LIST);
    $course_id = api_get_course_int_id();
    $sql = "SELECT * FROM $t_tool
            WHERE c_id = $course_id  AND name = '".Database::escape_string($name)."' ";
    $rs = Database::query($sql);

    return Database::fetch_array($rs, 'ASSOC');
}

/**
 * Function used to protect a "global" admin script.
 * The function blocks access when the user has no global platform admin rights.
 * Global admins are the admins that are registered in the main.admin table
 * AND the users who have access to the "principal" portal.
 * That means that there is a record in the main.access_url_rel_user table
 * with his user id and the access_url_id=1.
 *
 * @author Julio Montoya
 *
 * @param int $user_id
 *
 * @return bool
 */
function api_is_global_platform_admin($user_id = null)
{
    $user_id = (int) $user_id;
    if (empty($user_id)) {
        $user_id = api_get_user_id();
    }
    if (api_is_platform_admin_by_id($user_id)) {
        $urlList = api_get_access_url_from_user($user_id);
        // The admin is registered in the first "main" site with access_url_id = 1
        if (in_array(1, $urlList)) {
            return true;
        } else {
            return false;
        }
    }

    return false;
}

/**
 * @param int  $admin_id_to_check
 * @param int  $my_user_id
 * @param bool $allow_session_admin
 *
 * @return bool
 */
function api_global_admin_can_edit_admin(
    $admin_id_to_check,
    $my_user_id = null,
    $allow_session_admin = false
) {
    if (empty($my_user_id)) {
        $my_user_id = api_get_user_id();
    }

    $iam_a_global_admin = api_is_global_platform_admin($my_user_id);
    $user_is_global_admin = api_is_global_platform_admin($admin_id_to_check);

    if ($iam_a_global_admin) {
        // Global admin can edit everything
        return true;
    } else {
        // If i'm a simple admin
        $is_platform_admin = api_is_platform_admin_by_id($my_user_id);

        if ($allow_session_admin) {
            $is_platform_admin = api_is_platform_admin_by_id($my_user_id) || (api_get_user_status($my_user_id) == SESSIONADMIN);
        }

        if ($is_platform_admin) {
            if ($user_is_global_admin) {
                return false;
            } else {
                return true;
            }
        } else {
            return false;
        }
    }
}

/**
 * @param int  $admin_id_to_check
 * @param int  $my_user_id
 * @param bool $allow_session_admin
 *
 * @return bool|null
 */
function api_protect_super_admin($admin_id_to_check, $my_user_id = null, $allow_session_admin = false)
{
    if (api_global_admin_can_edit_admin($admin_id_to_check, $my_user_id, $allow_session_admin)) {
        return true;
    } else {
        api_not_allowed();
    }
}

/**
 * Function used to protect a global admin script.
 * The function blocks access when the user has no global platform admin rights.
 * See also the api_is_global_platform_admin() function wich defines who's a "global" admin.
 *
 * @author Julio Montoya
 */
function api_protect_global_admin_script()
{
    if (!api_is_global_platform_admin()) {
        api_not_allowed();

        return false;
    }

    return true;
}

/**
 * Get active template.
 *
 * @param string    theme type (optional: default)
 * @param string    path absolute(abs) or relative(rel) (optional:rel)
 *
 * @return string actived template path
 */
function api_get_template($path_type = 'rel')
{
    $path_types = ['rel', 'abs'];
    $template_path = '';
    if (in_array($path_type, $path_types)) {
        if ($path_type == 'rel') {
            $template_path = api_get_path(SYS_TEMPLATE_PATH);
        } else {
            $template_path = api_get_path(WEB_TEMPLATE_PATH);
        }
    }
    $actived_theme = 'default';
    if (api_get_setting('active_template')) {
        $actived_theme = api_get_setting('active_template');
    }
    $actived_theme_path = $template_path.$actived_theme.DIRECTORY_SEPARATOR;

    return $actived_theme_path;
}

/**
 * Check browser support for specific file types or features
 * This function checks if the user's browser supports a file format or given
 * feature, or returns the current browser and major version when
 * $format=check_browser. Only a limited number of formats and features are
 * checked by this method. Make sure you check its definition first.
 *
 * @param string $format Can be a file format (extension like svg, webm, ...) or a feature (like autocapitalize, ...)
 *
 * @return bool or return text array if $format=check_browser
 *
 * @author Juan Carlos Raña Trabado
 */
function api_browser_support($format = '')
{
    $browser = new Browser();
    $current_browser = $browser->getBrowser();
    $a_versiontemp = explode('.', $browser->getVersion());
    $current_majorver = $a_versiontemp[0];

    static $result;

    if (isset($result[$format])) {
        return $result[$format];
    }

    // Native svg support
    if ($format == 'svg') {
        if (($current_browser == 'Internet Explorer' && $current_majorver >= 9) ||
            ($current_browser == 'Firefox' && $current_majorver > 1) ||
            ($current_browser == 'Safari' && $current_majorver >= 4) ||
            ($current_browser == 'Chrome' && $current_majorver >= 1) ||
            ($current_browser == 'Opera' && $current_majorver >= 9)
        ) {
            $result[$format] = true;

            return true;
        } else {
            $result[$format] = false;

            return false;
        }
    } elseif ($format == 'pdf') {
        // native pdf support
        if ($current_browser == 'Chrome' && $current_majorver >= 6) {
            $result[$format] = true;

            return true;
        } else {
            $result[$format] = false;

            return false;
        }
    } elseif ($format == 'tif' || $format == 'tiff') {
        //native tif support
        if ($current_browser == 'Safari' && $current_majorver >= 5) {
            $result[$format] = true;

            return true;
        } else {
            $result[$format] = false;

            return false;
        }
    } elseif ($format == 'ogg' || $format == 'ogx' || $format == 'ogv' || $format == 'oga') {
        //native ogg, ogv,oga support
        if (($current_browser == 'Firefox' && $current_majorver >= 3) ||
            ($current_browser == 'Chrome' && $current_majorver >= 3) ||
            ($current_browser == 'Opera' && $current_majorver >= 9)) {
            $result[$format] = true;

            return true;
        } else {
            $result[$format] = false;

            return false;
        }
    } elseif ($format == 'mpg' || $format == 'mpeg') {
        //native mpg support
        if (($current_browser == 'Safari' && $current_majorver >= 5)) {
            $result[$format] = true;

            return true;
        } else {
            $result[$format] = false;

            return false;
        }
    } elseif ($format == 'mp4') {
        //native mp4 support (TODO: Android, iPhone)
        if ($current_browser == 'Android' || $current_browser == 'iPhone') {
            $result[$format] = true;

            return true;
        } else {
            $result[$format] = false;

            return false;
        }
    } elseif ($format == 'mov') {
        //native mov support( TODO:check iPhone)
        if ($current_browser == 'Safari' && $current_majorver >= 5 || $current_browser == 'iPhone') {
            $result[$format] = true;

            return true;
        } else {
            $result[$format] = false;

            return false;
        }
    } elseif ($format == 'avi') {
        //native avi support
        if ($current_browser == 'Safari' && $current_majorver >= 5) {
            $result[$format] = true;

            return true;
        } else {
            $result[$format] = false;

            return false;
        }
    } elseif ($format == 'wmv') {
        //native wmv support
        if ($current_browser == 'Firefox' && $current_majorver >= 4) {
            $result[$format] = true;

            return true;
        } else {
            $result[$format] = false;

            return false;
        }
    } elseif ($format == 'webm') {
        //native webm support (TODO:check IE9, Chrome9, Android)
        if (($current_browser == 'Firefox' && $current_majorver >= 4) ||
            ($current_browser == 'Opera' && $current_majorver >= 9) ||
            ($current_browser == 'Internet Explorer' && $current_majorver >= 9) ||
            ($current_browser == 'Chrome' && $current_majorver >= 9) ||
            $current_browser == 'Android'
        ) {
            $result[$format] = true;

            return true;
        } else {
            $result[$format] = false;

            return false;
        }
    } elseif ($format == 'wav') {
        //native wav support (only some codecs !)
        if (($current_browser == 'Firefox' && $current_majorver >= 4) ||
            ($current_browser == 'Safari' && $current_majorver >= 5) ||
            ($current_browser == 'Opera' && $current_majorver >= 9) ||
            ($current_browser == 'Internet Explorer' && $current_majorver >= 9) ||
            ($current_browser == 'Chrome' && $current_majorver > 9) ||
            $current_browser == 'Android' ||
            $current_browser == 'iPhone'
        ) {
            $result[$format] = true;

            return true;
        } else {
            $result[$format] = false;

            return false;
        }
    } elseif ($format == 'mid' || $format == 'kar') {
        //native midi support (TODO:check Android)
        if ($current_browser == 'Opera' && $current_majorver >= 9 || $current_browser == 'Android') {
            $result[$format] = true;

            return true;
        } else {
            $result[$format] = false;

            return false;
        }
    } elseif ($format == 'wma') {
        //native wma support
        if ($current_browser == 'Firefox' && $current_majorver >= 4) {
            $result[$format] = true;

            return true;
        } else {
            $result[$format] = false;

            return false;
        }
    } elseif ($format == 'au') {
        //native au support
        if ($current_browser == 'Safari' && $current_majorver >= 5) {
            $result[$format] = true;

            return true;
        } else {
            $result[$format] = false;

            return false;
        }
    } elseif ($format == 'mp3') {
        //native mp3 support (TODO:check Android, iPhone)
        if (($current_browser == 'Safari' && $current_majorver >= 5) ||
            ($current_browser == 'Chrome' && $current_majorver >= 6) ||
            ($current_browser == 'Internet Explorer' && $current_majorver >= 9) ||
            $current_browser == 'Android' ||
            $current_browser == 'iPhone' ||
            $current_browser == 'Firefox'
        ) {
            $result[$format] = true;

            return true;
        } else {
            $result[$format] = false;

            return false;
        }
    } elseif ($format == 'autocapitalize') {
        // Help avoiding showing the autocapitalize option if the browser doesn't
        // support it: this attribute is against the HTML5 standard
        if ($current_browser == 'Safari' || $current_browser == 'iPhone') {
            return true;
        } else {
            return false;
        }
    } elseif ($format == "check_browser") {
        $array_check_browser = [$current_browser, $current_majorver];

        return $array_check_browser;
    } else {
        $result[$format] = false;

        return false;
    }
}

/**
 * This function checks if exist path and file browscap.ini
 * In order for this to work, your browscap configuration setting in php.ini
 * must point to the correct location of the browscap.ini file on your system
 * http://php.net/manual/en/function.get-browser.php.
 *
 * @return bool
 *
 * @author Juan Carlos Raña Trabado
 */
function api_check_browscap()
{
    $setting = ini_get('browscap');
    if ($setting) {
        $browser = get_browser($_SERVER['HTTP_USER_AGENT'], true);
        if (strpos($setting, 'browscap.ini') && !empty($browser)) {
            return true;
        }
    }

    return false;
}

/**
 * Returns the <script> HTML tag.
 */
function api_get_js($file)
{
    return '<script type="text/javascript" src="'.api_get_path(WEB_LIBRARY_PATH).'javascript/'.$file.'"></script>'."\n";
}

function api_get_build_js($file)
{
    return '<script type="text/javascript" src="'.api_get_path(WEB_PUBLIC_PATH).'build/'.$file.'"></script>'."\n";
}

/**
 * Returns the <script> HTML tag.
 *
 * @return string
 */
function api_get_asset($file)
{
    return '<script type="text/javascript" src="'.api_get_path(WEB_PUBLIC_PATH).'libs/'.$file.'"></script>'."\n";
}

/**
 * Returns the <script> HTML tag.
 *
 * @param string $file
 * @param string $media
 *
 * @return string
 */
function api_get_css_asset($file, $media = 'screen')
{
    return '<link href="'.api_get_path(WEB_PUBLIC_PATH).'libs/'.$file.'" rel="stylesheet" media="'.$media.'" type="text/css" />'."\n";
}

/**
 * Returns the <link> HTML tag.
 *
 * @param string $file
 * @param string $media
 */
function api_get_css($file, $media = 'screen')
{
    return '<link href="'.$file.'" rel="stylesheet" media="'.$media.'" type="text/css" />'."\n";
}

function api_get_bootstrap_and_font_awesome($returnOnlyPath = false)
{
    $url = api_get_path(WEB_PUBLIC_PATH).'build/css/bootstrap.css';
    if ($returnOnlyPath) {
        return $url;
    }

    return '<link href="'.$url.'" rel="stylesheet" type="text/css" />'."\n";
}

/**
 * Returns the js header to include the jquery library.
 */
function api_get_jquery_js()
{
    return api_get_asset('jquery/jquery.min.js');
}

/**
 * Returns the jquery path.
 *
 * @return string
 */
function api_get_jquery_web_path()
{
    return api_get_path(WEB_PUBLIC_PATH).'assets/jquery/jquery.min.js';
}

/**
 * @return string
 */
function api_get_jquery_ui_js_web_path()
{
    return api_get_path(WEB_PUBLIC_PATH).'assets/jquery-ui/jquery-ui.min.js';
}

/**
 * @return string
 */
function api_get_jquery_ui_css_web_path()
{
    return api_get_path(WEB_PUBLIC_PATH).'assets/jquery-ui/themes/smoothness/jquery-ui.min.css';
}

/**
 * Returns the jquery-ui library js headers.
 *
 * @return string html tags
 */
function api_get_jquery_ui_js()
{
    $libraries = [];

    return api_get_jquery_libraries_js($libraries);
}

function api_get_jqgrid_js()
{
    $routePublic = Container::getRouter()->generate('legacy_public');

    return api_get_css($routePublic.'build/free-jqgrid.css').PHP_EOL
        .api_get_js_simple($routePublic.'build/free-jqgrid.js');
}

/**
 * Returns the jquery library js and css headers.
 *
 * @param   array   list of jquery libraries supported jquery-ui
 * @param   bool    add the jquery library
 *
 * @return string html tags
 */
function api_get_jquery_libraries_js($libraries)
{
    $js = '';

    //Document multiple upload funcionality
    if (in_array('jquery-uploadzs', $libraries)) {
        $js .= api_get_asset('blueimp-load-image/js/load-image.all.min.js');
        $js .= api_get_asset('blueimp-canvas-to-blob/js/canvas-to-blob.min.js');
        $js .= api_get_asset('jquery-file-upload/js/jquery.iframe-transport.js');
        $js .= api_get_asset('jquery-file-upload/js/jquery.fileupload.js');
        $js .= api_get_asset('jquery-file-upload/js/jquery.fileupload-process.js');
        $js .= api_get_asset('jquery-file-upload/js/jquery.fileupload-image.js');
        $js .= api_get_asset('jquery-file-upload/js/jquery.fileupload-audio.js');
        $js .= api_get_asset('jquery-file-upload/js/jquery.fileupload-video.js');
        $js .= api_get_asset('jquery-file-upload/js/jquery.fileupload-validate.js');

        $js .= api_get_css(api_get_path(WEB_PUBLIC_PATH).'assets/jquery-file-upload/css/jquery.fileupload.css');
        $js .= api_get_css(api_get_path(WEB_PUBLIC_PATH).'assets/jquery-file-upload/css/jquery.fileupload-ui.css');
    }

    // jquery datepicker
    if (in_array('datepicker', $libraries)) {
        $languaje = 'en-GB';
        $platform_isocode = strtolower(api_get_language_isocode());

        $datapicker_langs = [
            'af', 'ar', 'ar-DZ', 'az', 'bg', 'bs', 'ca', 'cs', 'cy-GB', 'da', 'de', 'el', 'en-AU', 'en-GB', 'en-NZ', 'eo', 'es', 'et', 'eu', 'fa', 'fi', 'fo', 'fr', 'fr-CH', 'gl', 'he', 'hi', 'hr', 'hu', 'hy', 'id', 'is', 'it', 'ja', 'ka', 'kk', 'km', 'ko', 'lb', 'lt', 'lv', 'mk', 'ml', 'ms', 'nl', 'nl-BE', 'no', 'pl', 'pt', 'pt-BR', 'rm', 'ro', 'ru', 'sk', 'sl', 'sq', 'sr', 'sr-SR', 'sv', 'ta', 'th', 'tj', 'tr', 'uk', 'vi', 'zh-CN', 'zh-HK', 'zh-TW',
        ];
        if (in_array($platform_isocode, $datapicker_langs)) {
            $languaje = $platform_isocode;
        }

        $js .= api_get_js('jquery-ui/jquery-ui-i18n.min.js');
        $script = '<script>
        $(function(){
            $.datepicker.setDefaults($.datepicker.regional["'.$languaje.'"]);
            $.datepicker.regional["local"] = $.datepicker.regional["'.$languaje.'"];
        });
        </script>
        ';
        $js .= $script;
    }

    return $js;
}

/**
 * Returns the URL to the course or session, removing the complexity of the URL
 * building piece by piece.
 *
 * This function relies on api_get_course_info()
 *
 * @param string $courseCode The course code - optional (takes it from context if not given)
 * @param int    $sessionId  The session ID  - optional (takes it from context if not given)
 * @param int    $groupId    The group ID - optional (takes it from context if not given)
 *
 * @return string The URL to a course, a session, or empty string if nothing works e.g. https://localhost/courses/ABC/index.php?session_id=3&gidReq=1
 *
 * @author  Julio Montoya <gugli100@gmail.com>
 */
function api_get_course_url($courseCode = null, $sessionId = null, $groupId = null)
{
    $courseDirectory = '';
    $url = '';
    // If courseCode not set, get context or []
    if (empty($courseCode)) {
        $courseInfo = api_get_course_info();
    } else {
        $courseInfo = api_get_course_info($courseCode);
    }

    // If course defined, get directory, otherwise keep empty string
    if (!empty($courseInfo['directory'])) {
        $courseDirectory = $courseInfo['directory'];
    }

    // If sessionId not set, get context or 0
    if (empty($sessionId)) {
        $sessionId = api_get_session_id();
    }

    // If groupId not set, get context or 0
    if (empty($groupId)) {
        $groupId = api_get_group_id();
    }

    // Build the URL
    if (!empty($courseDirectory)) {
        // directory not empty, so we do have a course
        $url = api_get_path(WEB_COURSE_PATH).$courseDirectory.'/index.php?id_session='.$sessionId.'&gidReq='.$groupId;
    } elseif (!empty($sessionId) &&
        api_get_setting('session.remove_session_url') !== 'true'
    ) {
        // if the course was unset and the session was set, send directly to the session
        $url = api_get_path(WEB_CODE_PATH).'session/index.php?session_id='.$sessionId;
    }

    // if not valid combination was found, return an empty string
    return $url;
}

/**
 * Check if the current portal has the $_configuration['multiple_access_urls'] parameter on.
 *
 * @return bool true if multi site is enabled
 */
function api_get_multiple_access_url()
{
    global $_configuration;
    if (isset($_configuration['multiple_access_urls']) && $_configuration['multiple_access_urls']) {
        return true;
    }

    return false;
}

/**
 * @return bool
 */
function api_is_multiple_url_enabled()
{
    return api_get_multiple_access_url();
}

/**
 * Returns a md5 unique id.
 *
 * @todo add more parameters
 */
function api_get_unique_id()
{
    $id = md5(time().uniqid().api_get_user_id().api_get_course_id().api_get_session_id());

    return $id;
}

/**
 * Get home path.
 *
 * @return string
 */
function api_get_home_path()
{
    // FIX : Start the routing determination from central path definition
    $home = api_get_path(SYS_HOME_PATH);
    if (api_get_multiple_access_url()) {
        $access_url_id = api_get_current_access_url_id();
        $url_info = api_get_access_url($access_url_id);
        $url = api_remove_trailing_slash(preg_replace('/https?:\/\//i', '', $url_info['url']));
        $clean_url = api_replace_dangerous_char($url);
        $clean_url = str_replace('/', '-', $clean_url);
        $clean_url .= '/';
        if ($clean_url != 'localhost/') {
            // means that the multiple URL was not well configured we don't rename the $home variable
            return "{$home}{$clean_url}";
        }
    }

    return $home;
}

/**
 * @param int Course id
 * @param int tool id: TOOL_QUIZ, TOOL_FORUM, TOOL_STUDENTPUBLICATION, TOOL_LEARNPATH
 * @param int the item id (tool id, exercise id, lp id)
 *
 * @return bool
 */
function api_resource_is_locked_by_gradebook($item_id, $link_type, $course_code = null)
{
    if (api_is_platform_admin()) {
        return false;
    }
    if (api_get_setting('gradebook_locking_enabled') == 'true') {
        if (empty($course_code)) {
            $course_code = api_get_course_id();
        }
        $table = Database::get_main_table(TABLE_MAIN_GRADEBOOK_LINK);
        $item_id = intval($item_id);
        $link_type = intval($link_type);
        $course_code = Database::escape_string($course_code);
        $sql = "SELECT locked FROM $table
                WHERE locked = 1 AND ref_id = $item_id AND type = $link_type AND course_code = '$course_code' ";
        $result = Database::query($sql);
        if (Database::num_rows($result)) {
            return true;
        }
    }

    return false;
}

/**
 * Blocks a page if the item was added in a gradebook.
 *
 * @param int       exercise id, work id, thread id,
 * @param int       LINK_EXERCISE, LINK_STUDENTPUBLICATION, LINK_LEARNPATH LINK_FORUM_THREAD, LINK_ATTENDANCE
 * see gradebook/lib/be/linkfactory
 * @param string    course code
 *
 * @return false|null
 */
function api_block_course_item_locked_by_gradebook($item_id, $link_type, $course_code = null)
{
    if (api_is_platform_admin()) {
        return false;
    }

    if (api_resource_is_locked_by_gradebook($item_id, $link_type, $course_code)) {
        $message = Display::return_message(get_lang('This option is not available because this activity is contained by an assessment, which is currently locked. To unlock the assessment, ask your platform administrator.'), 'warning');
        api_not_allowed(true, $message);
    }
}

/**
 * Checks the PHP version installed is enough to run Chamilo.
 *
 * @param string Include path (used to load the error page)
 */
function api_check_php_version()
{
    if (!function_exists('version_compare') ||
        version_compare(phpversion(), REQUIRED_PHP_VERSION, '<')
    ) {
        throw new Exception('Wrong PHP version');
    }
}

/**
 * Checks whether the Archive directory is present and writeable. If not,
 * prints a warning message.
 */
function api_check_archive_dir()
{
    if (is_dir(api_get_path(SYS_ARCHIVE_PATH)) && !is_writable(api_get_path(SYS_ARCHIVE_PATH))) {
        $message = Display::return_message(get_lang('The app/cache/ directory, used by this tool, is not writeable. Please contact your platform administrator.'), 'warning');
        api_not_allowed(true, $message);
    }
}

/**
 * Returns an array of global configuration settings which should be ignored
 * when printing the configuration settings screens.
 *
 * @return array Array of strings, each identifying one of the excluded settings
 */
function api_get_locked_settings()
{
    return [
        'permanently_remove_deleted_files',
        'account_valid_duration',
        'service_ppt2lp',
        'wcag_anysurfer_public_pages',
        'upload_extensions_list_type',
        'upload_extensions_blacklist',
        'upload_extensions_whitelist',
        'upload_extensions_skip',
        'upload_extensions_replace_by',
        'hide_dltt_markup',
        'split_users_upload_directory',
        'permissions_for_new_directories',
        'permissions_for_new_files',
        'platform_charset',
        'ldap_description',
        'cas_activate',
        'cas_server',
        'cas_server_uri',
        'cas_port',
        'cas_protocol',
        'cas_add_user_activate',
        'update_user_info_cas_with_ldap',
        'languagePriority1',
        'languagePriority2',
        'languagePriority3',
        'languagePriority4',
        'login_is_email',
        'chamilo_database_version',
    ];
}

/**
 * Checks if the user is corrently logged in. Returns the user ID if he is, or
 * false if he isn't. If the user ID is given and is an integer, then the same
 * ID is simply returned.
 *
 * @param  int User ID
 *
 * @return bool Integer User ID is logged in, or false otherwise
 */
function api_user_is_login($user_id = null)
{
    return Container::getAuthorizationChecker()->isGranted('IS_AUTHENTICATED_FULLY');
}

/**
 * Guess the real ip for register in the database, even in reverse proxy cases.
 * To be recognized, the IP has to be found in either $_SERVER['REMOTE_ADDR'] or
 * in $_SERVER['HTTP_X_FORWARDED_FOR'], which is in common use with rproxies.
 * Note: the result of this function is not SQL-safe. Please escape it before
 * inserting in a database.
 *
 * @return string the user's real ip (unsafe - escape it before inserting to db)
 *
 * @author Jorge Frisancho Jibaja <jrfdeft@gmail.com>, USIL - Some changes to allow the use of real IP using reverse proxy
 *
 * @version CEV CHANGE 24APR2012
 */
function api_get_real_ip()
{
    $ip = trim($_SERVER['REMOTE_ADDR']);
    if (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
        if (preg_match('/,/', $_SERVER['HTTP_X_FORWARDED_FOR'])) {
            @list($ip1, $ip2) = @explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
        } else {
            $ip1 = $_SERVER['HTTP_X_FORWARDED_FOR'];
        }
        $ip = trim($ip1);
    }

    return $ip;
}

/**
 * Checks whether an IP is included inside an IP range.
 *
 * @param string IP address
 * @param string IP range
 * @param string $ip
 *
 * @return bool True if IP is in the range, false otherwise
 *
 * @author claudiu at cnixs dot com  on http://www.php.net/manual/fr/ref.network.php#55230
 * @author Yannick Warnier for improvements and managment of multiple ranges
 *
 * @todo check for IPv6 support
 */
function api_check_ip_in_range($ip, $range)
{
    if (empty($ip) or empty($range)) {
        return false;
    }
    $ip_ip = ip2long($ip);
    // divide range param into array of elements
    if (strpos($range, ',') !== false) {
        $ranges = explode(',', $range);
    } else {
        $ranges = [$range];
    }
    foreach ($ranges as $range) {
        $range = trim($range);
        if (empty($range)) {
            continue;
        }
        if (strpos($range, '/') === false) {
            if (strcmp($ip, $range) === 0) {
                return true; // there is a direct IP match, return OK
            }
            continue; //otherwise, get to the next range
        }
        // the range contains a "/", so analyse completely
        list($net, $mask) = explode("/", $range);

        $ip_net = ip2long($net);
        // mask binary magic
        $ip_mask = ~((1 << (32 - $mask)) - 1);

        $ip_ip_net = $ip_ip & $ip_mask;
        if ($ip_ip_net == $ip_net) {
            return true;
        }
    }

    return false;
}

function api_check_user_access_to_legal($course_visibility)
{
    $course_visibility_list = [COURSE_VISIBILITY_OPEN_WORLD, COURSE_VISIBILITY_OPEN_PLATFORM];

    return in_array($course_visibility, $course_visibility_list) || api_is_drh();
}

/**
 * Checks if the global chat is enabled or not.
 *
 * @return bool
 */
function api_is_global_chat_enabled()
{
    return
        !api_is_anonymous() &&
        api_get_setting('allow_global_chat') === 'true' &&
        api_get_setting('allow_social_tool') === 'true';
}

/**
 * @todo Fix tool_visible_by_default_at_creation labels
 * @todo Add sessionId parameter to avoid using context
 *
 * @param int   $item_id
 * @param int   $tool_id
 * @param int   $group_id   id
 * @param array $courseInfo
 * @param int   $sessionId
 * @param int   $userId
 */
function api_set_default_visibility(
    $item_id,
    $tool_id,
    $group_id = 0,
    $courseInfo = [],
    $sessionId = 0,
    $userId = 0
) {
    $courseInfo = empty($courseInfo) ? api_get_course_info() : $courseInfo;
    $courseId = $courseInfo['real_id'];
    $courseCode = $courseInfo['code'];
    $sessionId = empty($sessionId) ? api_get_session_id() : $sessionId;
    $userId = empty($userId) ? api_get_user_id() : $userId;

    // if group is null force group_id = 0, this force is needed to create a LP folder with group = 0
    if (is_null($group_id)) {
        $group_id = 0;
    } else {
        $group_id = empty($group_id) ? api_get_group_id() : $group_id;
    }

    $groupInfo = [];
    if (!empty($group_id)) {
        $groupInfo = GroupManager::get_group_properties($group_id);
    }
    $original_tool_id = $tool_id;

    switch ($tool_id) {
        case TOOL_LINK:
        case TOOL_LINK_CATEGORY:
            $tool_id = 'links';
            break;
        case TOOL_DOCUMENT:
            $tool_id = 'documents';
            break;
        case TOOL_LEARNPATH:
            $tool_id = 'learning';
            break;
        case TOOL_ANNOUNCEMENT:
            $tool_id = 'announcements';
            break;
        case TOOL_FORUM:
        case TOOL_FORUM_CATEGORY:
        case TOOL_FORUM_THREAD:
            $tool_id = 'forums';
            break;
        case TOOL_QUIZ:
            $tool_id = 'quiz';
            break;
    }
    $setting = api_get_setting('tool_visible_by_default_at_creation');

    if (isset($setting[$tool_id])) {
        $visibility = 'invisible';
        if ($setting[$tool_id] == 'true') {
            $visibility = 'visible';
        }

        // Read the portal and course default visibility
        if ($tool_id === 'documents') {
            $visibility = DocumentManager::getDocumentDefaultVisibility($courseInfo);
        }

        api_item_property_update(
            $courseInfo,
            $original_tool_id,
            $item_id,
            $visibility,
            $userId,
            $groupInfo,
            null,
            null,
            null,
            $sessionId
        );

        // Fixes default visibility for tests
        switch ($original_tool_id) {
            case TOOL_QUIZ:
                if (empty($sessionId)) {
                    $objExerciseTmp = new Exercise($courseId);
                    $objExerciseTmp->read($item_id);
                    if ($visibility == 'visible') {
                        $objExerciseTmp->enable();
                        $objExerciseTmp->save();
                    } else {
                        $objExerciseTmp->disable();
                        $objExerciseTmp->save();
                    }
                }
                break;
        }
    }
}

/**
 * @return string
 */
function api_get_security_key()
{
    return api_get_configuration_value('security_key');
}

/**
 * @param int $user_id
 * @param int $courseId
 * @param int $session_id
 *
 * @return array
 */
function api_detect_user_roles($user_id, $courseId, $session_id = 0)
{
    $user_roles = [];
    $courseInfo = api_get_course_info_by_id($courseId);
    $course_code = $courseInfo['code'];

    $url_id = api_get_current_access_url_id();
    if (api_is_platform_admin_by_id($user_id, $url_id)) {
        $user_roles[] = PLATFORM_ADMIN;
    }

    /*if (api_is_drh()) {
        $user_roles[] = DRH;
    }*/

    if (!empty($session_id)) {
        if (SessionManager::user_is_general_coach($user_id, $session_id)) {
            $user_roles[] = SESSION_GENERAL_COACH;
        }
    }

    if (!empty($course_code)) {
        if (empty($session_id)) {
            if (CourseManager::is_course_teacher($user_id, $course_code)) {
                $user_roles[] = COURSEMANAGER;
            }
            if (CourseManager::get_tutor_in_course_status($user_id, $courseInfo['real_id'])) {
                $user_roles[] = COURSE_TUTOR;
            }

            if (CourseManager::is_user_subscribed_in_course($user_id, $course_code)) {
                $user_roles[] = COURSE_STUDENT;
            }
        } else {
            $user_status_in_session = SessionManager::get_user_status_in_course_session(
                $user_id,
                $courseId,
                $session_id
            );

            if (!empty($user_status_in_session)) {
                if ($user_status_in_session == 0) {
                    $user_roles[] = SESSION_STUDENT;
                }
                if ($user_status_in_session == 2) {
                    $user_roles[] = SESSION_COURSE_COACH;
                }
            }

            /*if (api_is_course_session_coach($user_id, $course_code, $session_id)) {
               $user_roles[] = SESSION_COURSE_COACH;
            }*/
        }
    }

    return $user_roles;
}

/**
 * @param int $courseId
 * @param int $session_id
 *
 * @return bool
 */
function api_coach_can_edit_view_results($courseId = null, $session_id = null)
{
    if (api_is_platform_admin()) {
        return true;
    }

    $user_id = api_get_user_id();

    if (empty($courseId)) {
        $courseId = api_get_course_int_id();
    }

    if (empty($session_id)) {
        $session_id = api_get_session_id();
    }

    $roles = api_detect_user_roles($user_id, $courseId, $session_id);

    if (in_array(SESSION_COURSE_COACH, $roles)) {
        //return api_get_setting('session_tutor_reports_visibility') == 'true';
        return true;
    } else {
        if (in_array(COURSEMANAGER, $roles)) {
            return true;
        }

        return false;
    }
}

/**
 * @param string $file
 *
 * @return string
 */
function api_get_js_simple($file)
{
    return '<script type="text/javascript" src="'.$file.'"></script>'."\n";
}

function api_set_settings_and_plugins()
{
    global $_configuration;
    $_setting = [];
    $_plugins = [];

    // access_url == 1 is the default chamilo location
    $settings_by_access_list = [];
    $access_url_id = api_get_current_access_url_id();
    if ($access_url_id != 1) {
        $url_info = api_get_access_url($_configuration['access_url']);
        if ($url_info['active'] == 1) {
            $settings_by_access = &api_get_settings(null, 'list', $_configuration['access_url'], 1);
            foreach ($settings_by_access as &$row) {
                if (empty($row['variable'])) {
                    $row['variable'] = 0;
                }
                if (empty($row['subkey'])) {
                    $row['subkey'] = 0;
                }
                if (empty($row['category'])) {
                    $row['category'] = 0;
                }
                $settings_by_access_list[$row['variable']][$row['subkey']][$row['category']] = $row;
            }
        }
    }

    $result = api_get_settings(null, 'list', 1);

    foreach ($result as &$row) {
        if ($access_url_id != 1) {
            if ($url_info['active'] == 1) {
                $var = empty($row['variable']) ? 0 : $row['variable'];
                $subkey = empty($row['subkey']) ? 0 : $row['subkey'];
                $category = empty($row['category']) ? 0 : $row['category'];
            }

            if ($row['access_url_changeable'] == 1 && $url_info['active'] == 1) {
                if (isset($settings_by_access_list[$var]) &&
                    $settings_by_access_list[$var][$subkey][$category]['selected_value'] != '') {
                    if ($row['subkey'] == null) {
                        $_setting[$row['variable']] = $settings_by_access_list[$var][$subkey][$category]['selected_value'];
                    } else {
                        $_setting[$row['variable']][$row['subkey']] = $settings_by_access_list[$var][$subkey][$category]['selected_value'];
                    }
                } else {
                    if ($row['subkey'] == null) {
                        $_setting[$row['variable']] = $row['selected_value'];
                    } else {
                        $_setting[$row['variable']][$row['subkey']] = $row['selected_value'];
                    }
                }
            } else {
                if ($row['subkey'] == null) {
                    $_setting[$row['variable']] = $row['selected_value'];
                } else {
                    $_setting[$row['variable']][$row['subkey']] = $row['selected_value'];
                }
            }
        } else {
            if ($row['subkey'] == null) {
                $_setting[$row['variable']] = $row['selected_value'];
            } else {
                $_setting[$row['variable']][$row['subkey']] = $row['selected_value'];
            }
        }
    }

    $result = api_get_settings('Plugins', 'list', $access_url_id);
    $_plugins = [];
    foreach ($result as &$row) {
        $key = &$row['variable'];
        if (is_string($_setting[$key])) {
            $_setting[$key] = [];
        }
        $_setting[$key][] = $row['selected_value'];
        $_plugins[$key][] = $row['selected_value'];
    }

    $_SESSION['_setting'] = $_setting;
    $_SESSION['_plugins'] = $_plugins;
}

/**
 * Modify default memory_limit and max_execution_time limits
 * Needed when processing long tasks.
 */
function api_set_more_memory_and_time_limits()
{
    if (function_exists('ini_set')) {
        api_set_memory_limit('256M');
        ini_set('max_execution_time', 1800);
    }
}

/**
 * Tries to set memory limit, if authorized and new limit is higher than current.
 *
 * @param string $mem New memory limit
 *
 * @return bool True on success, false on failure or current is higher than suggested
 * @assert (null) === false
 * @assert (-1) === false
 * @assert (0) === true
 * @assert ('1G') === true
 */
function api_set_memory_limit($mem)
{
    //if ini_set() not available, this function is useless
    if (!function_exists('ini_set') || is_null($mem) || $mem == -1) {
        return false;
    }

    $memory_limit = ini_get('memory_limit');
    if (api_get_bytes_memory_limit($mem) > api_get_bytes_memory_limit($memory_limit)) {
        ini_set('memory_limit', $mem);

        return true;
    }

    return false;
}

/**
 * Gets memory limit in bytes.
 *
 * @param string The memory size (128M, 1G, 1000K, etc)
 *
 * @return int
 * @assert (null) === false
 * @assert ('1t')  === 1099511627776
 * @assert ('1g')  === 1073741824
 * @assert ('1m')  === 1048576
 * @assert ('100k') === 102400
 */
function api_get_bytes_memory_limit($mem)
{
    $size = strtolower(substr($mem, -1));

    switch ($size) {
        case 't':
            $mem = intval(substr($mem, -1)) * 1024 * 1024 * 1024 * 1024;
            break;
        case 'g':
            $mem = intval(substr($mem, 0, -1)) * 1024 * 1024 * 1024;
            break;
        case 'm':
            $mem = intval(substr($mem, 0, -1)) * 1024 * 1024;
            break;
        case 'k':
            $mem = intval(substr($mem, 0, -1)) * 1024;
            break;
        default:
            // we assume it's integer only
            $mem = intval($mem);
            break;
    }

    return $mem;
}

/**
 * Finds all the information about a user from username instead of user id.
 *
 * @param string $officialCode
 *
 * @return array $user_info user_id, lastname, firstname, username, email, ...
 *
 * @author Yannick Warnier <yannick.warnier@beeznest.com>
 */
function api_get_user_info_from_official_code($officialCode)
{
    if (empty($officialCode)) {
        return false;
    }
    $sql = "SELECT * FROM ".Database::get_main_table(TABLE_MAIN_USER)."
            WHERE official_code ='".Database::escape_string($officialCode)."'";
    $result = Database::query($sql);
    if (Database::num_rows($result) > 0) {
        $result_array = Database::fetch_array($result);

        return _api_format_user($result_array);
    }

    return false;
}

/**
 * @param string $usernameInputId
 * @param string $passwordInputId
 *
 * @return string|null
 */
function api_get_password_checker_js($usernameInputId, $passwordInputId)
{
    $checkPass = api_get_setting('allow_strength_pass_checker');
    $useStrengthPassChecker = $checkPass === 'true';

    if ($useStrengthPassChecker === false) {
        return null;
    }

    $translations = [
        'wordLength' => get_lang('The password is too short'),
        'wordNotEmail' => get_lang('Your password cannot be the same as your email'),
        'wordSimilarToUsername' => get_lang('Your password cannot contain your username'),
        'wordTwoCharacterClasses' => get_lang('Use different character classes'),
        'wordRepetitions' => get_lang('Too many repetitions'),
        'wordSequences' => get_lang('Your password contains sequences'),
        'errorList' => get_lang('errors found'),
        'veryWeak' => get_lang('Very weak'),
        'weak' => get_lang('Weak'),
        'normal' => get_lang('Normal'),
        'medium' => get_lang('Medium'),
        'strong' => get_lang('Strong'),
        'veryStrong' => get_lang('Very strong'),
    ];

    $js = api_get_asset('pwstrength-bootstrap/dist/pwstrength-bootstrap.min.js');
    $js .= "<script>
    var errorMessages = {
        password_to_short : \"".get_lang('The password is too short')."\",
        same_as_username : \"".get_lang('Your password cannot be the same as your username')."\"
    };

    $(function() {
        var lang = ".json_encode($translations).";     
        var options = {        
            onLoad : function () {
                //$('#messages').text('Start typing password');
            },
            onKeyUp: function (evt) {
                $(evt.target).pwstrength('outputErrorList');
            },
            errorMessages : errorMessages,
            viewports: {
                progress: '#password_progress',
                verdict: '#password-verdict',
                errors: '#password-errors'
            },
            usernameField: '$usernameInputId'
        };
        options.i18n = {
            t: function (key) {
                var result = lang[key];
                return result === key ? '' : result; // This assumes you return the                
            }
        };
        $('".$passwordInputId."').pwstrength(options);
    });
    </script>";

    return $js;
}

/**
 * create an user extra field called 'captcha_blocked_until_date'.
 *
 * @param string $username
 *
 * @return bool
 */
function api_block_account_captcha($username)
{
    $userInfo = api_get_user_info_from_username($username);
    if (empty($userInfo)) {
        return false;
    }
    $minutesToBlock = api_get_setting('captcha_time_to_block');
    $time = time() + $minutesToBlock * 60;
    UserManager::update_extra_field_value(
        $userInfo['user_id'],
        'captcha_blocked_until_date',
        api_get_utc_datetime($time)
    );

    return true;
}

/**
 * @param string $username
 *
 * @return bool
 */
function api_clean_account_captcha($username)
{
    $userInfo = api_get_user_info_from_username($username);
    if (empty($userInfo)) {
        return false;
    }
    Session::erase('loginFailedCount');
    UserManager::update_extra_field_value(
        $userInfo['user_id'],
        'captcha_blocked_until_date',
        null
    );

    return true;
}

/**
 * @param string $username
 *
 * @return bool
 */
function api_get_user_blocked_by_captcha($username)
{
    $userInfo = api_get_user_info_from_username($username);
    if (empty($userInfo)) {
        return false;
    }
    $data = UserManager::get_extra_user_data_by_field(
        $userInfo['user_id'],
        'captcha_blocked_until_date'
    );
    if (isset($data) && isset($data['captcha_blocked_until_date'])) {
        return $data['captcha_blocked_until_date'];
    }

    return false;
}

/**
 * Remove tags from HTML anf return the $in_number_char first non-HTML char
 * Postfix the text with "..." if it has been truncated.
 *
 * @param string $text
 * @param int    $number
 *
 * @return string
 *
 * @author hubert borderiou
 */
function api_get_short_text_from_html($text, $number)
{
    // Delete script and style tags
    $text = preg_replace('/(<(script|style)\b[^>]*>).*?(<\/\2>)/is', "$1$3", $text);
    $text = api_html_entity_decode($text);
    $out_res = api_remove_tags_with_space($text, false);
    $postfix = "...";
    if (strlen($out_res) > $number) {
        $out_res = substr($out_res, 0, $number).$postfix;
    }

    return $out_res;
}

/**
 * Replace tags with a space in a text.
 * If $in_double_quote_replace, replace " with '' (for HTML attribute purpose, for exemple).
 *
 * @return string
 *
 * @author hubert borderiou
 */
function api_remove_tags_with_space($in_html, $in_double_quote_replace = true)
{
    $out_res = $in_html;
    if ($in_double_quote_replace) {
        $out_res = str_replace('"', "''", $out_res);
    }
    // avoid text stuck together when tags are removed, adding a space after >
    $out_res = str_replace(">", "> ", $out_res);
    $out_res = strip_tags($out_res);

    return $out_res;
}

/**
 * If true, the drh can access all content (courses, users) inside a session.
 *
 * @return bool
 */
function api_drh_can_access_all_session_content()
{
    $value = api_get_setting('drh_can_access_all_session_content');

    return $value === 'true';
}

/**
 * @param string $tool
 * @param string $setting
 * @param int    $defaultValue
 *
 * @return string
 */
function api_get_default_tool_setting($tool, $setting, $defaultValue)
{
    global $_configuration;
    if (isset($_configuration[$tool]) &&
        isset($_configuration[$tool]['default_settings']) &&
        isset($_configuration[$tool]['default_settings'][$setting])
    ) {
        return $_configuration[$tool]['default_settings'][$setting];
    }

    return $defaultValue;
}

/**
 * Checks if user can login as another user.
 *
 * @param int $loginAsUserId the user id to log in
 * @param int $userId        my user id
 *
 * @return bool
 */
function api_can_login_as($loginAsUserId, $userId = null)
{
    if (empty($userId)) {
        $userId = api_get_user_id();
    }
    if ($loginAsUserId == $userId) {
        return false;
    }

    if (empty($loginAsUserId)) {
        return false;
    }

    if ($loginAsUserId != strval(intval($loginAsUserId))) {
        return false;
    }

    // Check if the user to login is an admin
    if (api_is_platform_admin_by_id($loginAsUserId)) {
        // Only super admins can login to admin accounts
        if (!api_global_admin_can_edit_admin($loginAsUserId)) {
            return false;
        }
    }

    $userInfo = api_get_user_info($loginAsUserId);
    $isDrh = function () use ($loginAsUserId) {
        if (api_is_drh()) {
            if (api_drh_can_access_all_session_content()) {
                $users = SessionManager::getAllUsersFromCoursesFromAllSessionFromStatus(
                    'drh_all',
                    api_get_user_id()
                );
                $userList = [];
                if (is_array($users)) {
                    foreach ($users as $user) {
                        $userList[] = $user['user_id'];
                    }
                }
                if (in_array($loginAsUserId, $userList)) {
                    return true;
                }
            } else {
                if (api_is_drh() &&
                    UserManager::is_user_followed_by_drh($loginAsUserId, api_get_user_id())
                ) {
                    return true;
                }
            }
        }

        return false;
    };

    $loginAsStatusForSessionAdmins = [STUDENT];

    if (api_get_setting('session.allow_session_admin_login_as_teacher')) {
        $loginAsStatusForSessionAdmins[] = COURSEMANAGER;
    }

    return api_is_platform_admin() ||
        (api_is_session_admin() && in_array($userInfo['status'], $loginAsStatusForSessionAdmins)) ||
        $isDrh();
}

/**
 * @return bool
 */
function api_is_allowed_in_course()
{
    if (api_is_platform_admin()) {
        return true;
    }

    $user = api_get_current_user();
    if ($user instanceof User) {
        if ($user->hasRole('ROLE_CURRENT_SESSION_COURSE_STUDENT') ||
            $user->hasRole('ROLE_CURRENT_SESSION_COURSE_TEACHER') ||
            $user->hasRole('ROLE_CURRENT_COURSE_STUDENT') ||
            $user->hasRole('ROLE_CURRENT_COURSE_TEACHER')
        ) {
            return true;
        }
    }

    return false;
}

/**
 * Set the cookie to go directly to the course code $in_firstpage
 * after login.
 *
 * @param string $value is the course code of the course to go
 */
function api_set_firstpage_parameter($value)
{
    setcookie('GotoCourse', $value);
}

/**
 * Delete the cookie to go directly to the course code $in_firstpage
 * after login.
 */
function api_delete_firstpage_parameter()
{
    setcookie('GotoCourse', '', time() - 3600);
}

/**
 * @return bool if course_code for direct course access after login is set
 */
function exist_firstpage_parameter()
{
    return isset($_COOKIE['GotoCourse']) && $_COOKIE['GotoCourse'] != '';
}

/**
 * @return return the course_code of the course where user login
 */
function api_get_firstpage_parameter()
{
    return $_COOKIE['GotoCourse'];
}

/**
 * Return true on https install.
 *
 * @return bool
 */
function api_is_https()
{
    if (!empty($_SERVER['HTTP_X_FORWARDED_PROTO']) &&
        $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https' || !empty($_configuration['force_https_forwarded_proto'])
    ) {
        $isSecured = true;
    } else {
        if (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off') {
            $isSecured = true;
        } else {
            $isSecured = false;
            // last chance
            if (!empty($_SERVER['SERVER_PORT']) && $_SERVER['SERVER_PORT'] == 443) {
                $isSecured = true;
            }
        }
    }

    return $isSecured;
}

/**
 * Return protocol (http or https).
 *
 * @return string
 */
function api_get_protocol()
{
    return api_is_https() ? 'https' : 'http';
}

/**
 * Return a string where " are replaced with 2 '
 * It is useful when you pass a PHP variable in a Javascript browser dialog
 * e.g. : alert("<?php get_lang('Message') ?>");
 * and message contains character ".
 *
 * @param string $in_text
 *
 * @return string
 */
function convert_double_quote_to_single($in_text)
{
    return api_preg_replace('/"/', "''", $in_text);
}

/**
 * Get origin.
 *
 * @param string
 *
 * @return string
 */
function api_get_origin()
{
    $origin = isset($_REQUEST['origin']) ? Security::remove_XSS($_REQUEST['origin']) : '';

    return $origin;
}

/**
 * Warns an user that the portal reach certain limit.
 *
 * @param string $limitName
 */
function api_warn_hosting_contact($limitName)
{
    $hostingParams = api_get_configuration_value(1);
    $email = null;

    if (!empty($hostingParams)) {
        if (isset($hostingParams['hosting_contact_mail'])) {
            $email = $hostingParams['hosting_contact_mail'];
        }
    }

    if (!empty($email)) {
        $subject = get_lang('Hosting warning reached');
        $body = get_lang('Portal name').': '.api_get_path(WEB_PATH)." \n ";
        $body .= get_lang('Portal\'s limit type').': '.$limitName." \n ";
        if (isset($hostingParams[$limitName])) {
            $body .= get_lang('Value').': '.$hostingParams[$limitName];
        }
        api_mail_html(null, $email, $subject, $body);
    }
}

/**
 * Gets value of a variable from config/configuration.php
 * Variables that are not set in the configuration.php file but set elsewhere:
 * - virtual_css_theme_folder (vchamilo plugin)
 * - access_url (global.inc.php)
 * - apc/apc_prefix (global.inc.php).
 *
 * @param string $variable
 *
 * @return bool|mixed
 */
function api_get_configuration_value($variable)
{
    global $_configuration;
    // Check the current url id, id = 1 by default
    $urlId = isset($_configuration['access_url']) ? (int) $_configuration['access_url'] : 1;

    $variable = trim($variable);

    // Check if variable exists
    if (isset($_configuration[$variable])) {
        if (is_array($_configuration[$variable])) {
            // Check if it exists for the sub portal
            if (array_key_exists($urlId, $_configuration[$variable])) {
                return $_configuration[$variable][$urlId];
            } else {
                // Try to found element with id = 1 (master portal)
                if (array_key_exists(1, $_configuration[$variable])) {
                    return $_configuration[$variable][1];
                }
            }
        }

        return $_configuration[$variable];
    }

    return false;
}

/**
 * Returns supported image extensions in the portal.
 *
 * @param bool $supportVectors Whether vector images should also be accepted or not
 *
 * @return array Supported image extensions in the portal
 */
function api_get_supported_image_extensions($supportVectors = true)
{
    // jpg can also be called jpeg, jpe, jfif and jif. See https://en.wikipedia.org/wiki/JPEG#JPEG_filename_extensions
    $supportedImageExtensions = ['jpg', 'jpeg', 'png', 'gif', 'jpe', 'jfif', 'jif'];
    if ($supportVectors) {
        array_push($supportedImageExtensions, 'svg');
    }
    if (version_compare(PHP_VERSION, '5.5.0', '>=')) {
        array_push($supportedImageExtensions, 'webp');
    }

    return $supportedImageExtensions;
}

/**
 * This setting changes the registration status for the campus.
 *
 * @author Patrick Cool <patrick.cool@UGent.be>, Ghent University
 *
 * @version August 2006
 *
 * @param bool $listCampus Whether we authorize
 *
 * @todo the $_settings should be reloaded here. => write api function for this and use this in global.inc.php also.
 */
function api_register_campus($listCampus = true)
{
    $tbl_settings = Database::get_main_table(TABLE_MAIN_SETTINGS_CURRENT);

    $sql = "UPDATE $tbl_settings SET selected_value='true' WHERE variable='registered'";
    Database::query($sql);

    if (!$listCampus) {
        $sql = "UPDATE $tbl_settings SET selected_value='true' WHERE variable='donotlistcampus'";
        Database::query($sql);
    }
}

/**
 * Checks whether current user is a student boss.
 *
 * @global array $_user
 *
 * @return bool
 */
function api_is_student_boss()
{
    $_user = api_get_user_info();

    return isset($_user['status']) && $_user['status'] == STUDENT_BOSS;
}

/**
 * Check whether the user type should be exclude.
 * Such as invited or anonymous users.
 *
 * @param bool $checkDB Optional. Whether check the user status
 * @param int  $userId  Options. The user id
 *
 * @return bool
 */
function api_is_excluded_user_type($checkDB = false, $userId = 0)
{
    if ($checkDB) {
        $userId = empty($userId) ? api_get_user_id() : (int) $userId;

        if ($userId == 0) {
            return true;
        }

        $userInfo = api_get_user_info($userId);

        switch ($userInfo['status']) {
            case INVITEE:
            case ANONYMOUS:
                return true;
            default:
                return false;
        }
    }

    $isInvited = api_is_invitee();
    $isAnonymous = api_is_anonymous();

    if ($isInvited || $isAnonymous) {
        return true;
    }

    return false;
}

/**
 * Get the user status to ignore in reports.
 *
 * @param string $format Optional. The result type (array or string)
 *
 * @return array|string
 */
function api_get_users_status_ignored_in_reports($format = 'array')
{
    $excludedTypes = [
        INVITEE,
        ANONYMOUS,
    ];

    if ($format == 'string') {
        return implode(', ', $excludedTypes);
    }

    return $excludedTypes;
}

/**
 * Set the Site Use Cookie Warning for 1 year.
 */
function api_set_site_use_cookie_warning_cookie()
{
    setcookie('ChamiloUsesCookies', 'ok', time() + 31556926);
}

/**
 * Return true if the Site Use Cookie Warning Cookie warning exists.
 *
 * @return bool
 */
function api_site_use_cookie_warning_cookie_exist()
{
    return isset($_COOKIE['ChamiloUsesCookies']);
}

/**
 * Given a number of seconds, format the time to show hours, minutes and seconds.
 *
 * @param int    $time         The time in seconds
 * @param string $originFormat Optional. PHP o JS
 *
 * @return string (00h00'00")
 */
function api_format_time($time, $originFormat = 'php')
{
    $h = get_lang('h');
    $hours = $time / 3600;
    $mins = ($time % 3600) / 60;
    $secs = ($time % 60);

    if ($time < 0) {
        $hours = 0;
        $mins = 0;
        $secs = 0;
    }

    if ($originFormat == 'js') {
        $formattedTime = trim(sprintf("%02d : %02d : %02d", $hours, $mins, $secs));
    } else {
        $formattedTime = trim(sprintf("%02d$h%02d'%02d\"", $hours, $mins, $secs));
    }

    return $formattedTime;
}

/**
 * Create a new empty directory with index.html file.
 *
 * @param string $name            The new directory name
 * @param string $parentDirectory Directory parent directory name
 * @deprecated use Resources
 *
 * @return bool Return true if the directory was create. Otherwise return false
 */
function api_create_protected_dir($name, $parentDirectory)
{
    $isCreated = false;

    if (!is_writable($parentDirectory)) {
        return false;
    }

    $fullPath = $parentDirectory.api_replace_dangerous_char($name);

    if (mkdir($fullPath, api_get_permissions_for_new_directories(), true)) {
        $fp = fopen($fullPath.'/index.html', 'w');

        if ($fp) {
            if (fwrite($fp, '<html><head></head><body></body></html>')) {
                $isCreated = true;
            }
        }

        fclose($fp);
    }

    return $isCreated;
}

/**
 * Sends an email
 * Sender name and email can be specified, if not specified
 * name and email of the platform admin are used.
 *
 * @param string    name of recipient
 * @param string    email of recipient
 * @param string    email subject
 * @param string    email body
 * @param string    sender name
 * @param string    sender e-mail
 * @param array     extra headers in form $headers = array($name => $value) to allow parsing
 * @param array     data file (path and filename)
 * @param bool      True for attaching a embedded file inside content html (optional)
 * @param array     Additional parameters
 *
 * @return bool true if mail was sent
 */
function api_mail_html(
    $recipientName,
    $recipientEmail,
    $subject,
    $body,
    $senderName = '',
    $senderEmail = '',
    $extra_headers = [],
    $data_file = [],
    $embeddedImage = false,
    $additionalParameters = []
) {
    if (!api_valid_email($recipientEmail)) {
        return false;
    }

    // Default values
    $notification = new Notification();
    $defaultEmail = $notification->getDefaultPlatformSenderEmail();
    $defaultName = $notification->getDefaultPlatformSenderName();

    // If the parameter is set don't use the admin.
    $senderName = !empty($senderName) ? $senderName : $defaultName;
    $senderEmail = !empty($senderEmail) ? $senderEmail : $defaultEmail;

    // Reply to first
    $replyToName = '';
    $replyToEmail = '';
    if (isset($extra_headers['reply_to'])) {
        $replyToEmail = $extra_headers['reply_to']['mail'];
        $replyToName = $extra_headers['reply_to']['name'];
    }

    //If the SMTP configuration only accept one sender
    /*if (isset($platform_email['SMTP_UNIQUE_SENDER']) && $platform_email['SMTP_UNIQUE_SENDER']) {
        $senderName = $platform_email['SMTP_FROM_NAME'];
        $senderEmail = $platform_email['SMTP_FROM_EMAIL'];
        $valid = PHPMailer::validateAddress($senderEmail);
        if ($valid) {
            //force-set Sender to $senderEmail, otherwise SetFrom only does it if it is currently empty
            $mail->Sender = $senderEmail;
        }
    }*/

    /*$mail->SetFrom($senderEmail, $senderName);
    $mail->Subject = $subject;
    $mail->AltBody = strip_tags(
        str_replace('<br />', "\n", api_html_entity_decode($message))
    );*/

    /*if (is_array($extra_headers) && count($extra_headers) > 0) {
        foreach ($extra_headers as $key => $value) {
            switch (strtolower($key)) {
                case 'encoding':
                case 'content-transfer-encoding':
                    $mail->Encoding = $value;
                    break;
                case 'charset':
                    $mail->Charset = $value;
                    break;
                case 'contenttype':
                case 'content-type':
                    $mail->ContentType = $value;
                    break;
                default:
                    $mail->AddCustomHeader($key.':'.$value);
                    break;
            }
        }
    } else {
        if (!empty($extra_headers)) {
            $mail->AddCustomHeader($extra_headers);
        }
    }*/

    // WordWrap the html body (phpMailer only fixes AltBody) FS#2988
    //$mail->Body = $mail->WrapText($mail->Body, $mail->WordWrap);
    try {
        $message = new \Swift_Message($subject);

        $list = api_get_configuration_value('send_all_emails_to');
        if (!empty($list) && isset($list['emails'])) {
            foreach ($list['emails'] as $email) {
                $message->addCc($email);
            }
        }

        // Attachment
        if (!empty($data_file)) {
            foreach ($data_file as $file_attach) {
                if (!empty($file_attach['path']) && !empty($file_attach['filename'])) {
                    //$message->attach(Swift_Attachment::fromPath($file_attach['path'], $file_attach['filename']);
                    $message->attach(
                        Swift_Attachment::fromPath($file_attach['path'])->setFilename($file_attach['filename'])
                    );
                }
            }
        }

        $noReply = api_get_setting('noreply_email_address');
        $automaticEmailText = '';
        if (!empty($noReply)) {
            $automaticEmailText = '<br />'.get_lang('This is an automatic email message. Please do not reply to it.');
        }

        $params = [
            'content' => '',
            'mail_header_style' => api_get_configuration_value('mail_header_style'),
            'mail_content_style' => api_get_configuration_value('mail_content_style'),
            'link' => $additionalParameters['link'] ?? '',
            'automatic_email_text' => $automaticEmailText,
        ];

        $paramsHtml = $paramsText = $params;

        $paramsHtml['content'] = $body;
        $paramsText['content'] = str_replace('<br />', "\n", api_html_entity_decode($body));

        if (!empty($senderEmail)) {
            $message->setFrom([$senderEmail => $senderName]);
        }

        if (!empty($recipientEmail)) {
            $message->setTo([$recipientEmail => $recipientName]);
        }

        if (!empty($replyToEmail)) {
            $message->setReplyTo([$replyToEmail => $replyToName]);
        }

        $message
            ->setBody(
                Container::getTwig()->render(
                    'ChamiloThemeBundle:Mailer:Default/default.html.twig',
                    $paramsHtml
                ),
                'text/html'
            )
            ->addPart(
                Container::getTwig()->render(
                    'ChamiloThemeBundle:Mailer:Default/default.text.twig',
                    $paramsText
                ),
                'text/plain'
            )
            //->setEncoder(\Swift_Encoding::get8BitEncoding())
        ;

        $type = $message->getHeaders()->get('Content-Type');
        $type->setCharset('utf-8');
        Container::getMailer()->send($message);

        return true;
    } catch (Exception $e) {
        error_log($e->getMessage());
    }

    if (!empty($additionalParameters)) {
        $plugin = new AppPlugin();
        $smsPlugin = $plugin->getSMSPluginLibrary();
        if ($smsPlugin) {
            $smsPlugin->send($additionalParameters);
        }
    }

    return 1;
}

/**
 * @param string $tool       Possible values: GroupManager::GROUP_TOOL_*
 * @param bool   $showHeader
 */
function api_protect_course_group($tool, $showHeader = true)
{
    $groupId = api_get_group_id();
    if (!empty($groupId)) {
        if (api_is_platform_admin()) {
            return true;
        }

        if (api_is_allowed_to_edit(false, true, true)) {
            return true;
        }

        $userId = api_get_user_id();
        $sessionId = api_get_session_id();
        if (!empty($sessionId)) {
            if (api_is_coach($sessionId, api_get_course_int_id())) {
                return true;
            }

            if (api_is_drh()) {
                if (SessionManager::isUserSubscribedAsHRM($sessionId, $userId)) {
                    return true;
                }
            }
        }

        $groupInfo = GroupManager::get_group_properties($groupId);

        // Group doesn't exists
        if (empty($groupInfo)) {
            api_not_allowed($showHeader);
        }

        // Check group access
        $allow = GroupManager::user_has_access(
            $userId,
            $groupInfo['iid'],
            $tool
        );

        if (!$allow) {
            api_not_allowed($showHeader);
        }
    }
}

/**
 * Check if a date is in a date range.
 *
 * @param datetime $startDate
 * @param datetime $endDate
 * @param datetime $currentDate
 *
 * @return bool true if date is in rage, false otherwise
 */
function api_is_date_in_date_range($startDate, $endDate, $currentDate = null)
{
    $startDate = strtotime(api_get_local_time($startDate));
    $endDate = strtotime(api_get_local_time($endDate));
    $currentDate = strtotime(api_get_local_time($currentDate));

    if ($currentDate >= $startDate && $currentDate <= $endDate) {
        return true;
    }

    return false;
}

/**
 * Eliminate the duplicates of a multidimensional array by sending the key.
 *
 * @param array $array multidimensional array
 * @param int   $key   key to find to compare
 *
 * @return array
 */
function api_unique_multidim_array($array, $key)
{
    $temp_array = [];
    $i = 0;
    $key_array = [];

    foreach ($array as $val) {
        if (!in_array($val[$key], $key_array)) {
            $key_array[$i] = $val[$key];
            $temp_array[$i] = $val;
        }
        $i++;
    }

    return $temp_array;
}

/**
 * Limit the access to Session Admins when the limit_session_admin_role
 * configuration variable is set to true.
 */
function api_protect_limit_for_session_admin()
{
    $limitAdmin = api_get_setting('limit_session_admin_role');
    if (api_is_session_admin() && $limitAdmin === 'true') {
        api_not_allowed(true);
    }
}

/**
 * Limits that a session admin has access to list users.
 * When limit_session_admin_list_users configuration variable is set to true.
 */
function api_protect_session_admin_list_users()
{
    $limitAdmin = api_get_configuration_value('limit_session_admin_list_users');

    if (api_is_session_admin() && true === $limitAdmin) {
        api_not_allowed(true);
    }
}

/**
 * @return bool
 */
function api_is_student_view_active()
{
    $studentView = Session::read('studentview');

    return $studentView === 'studentview';
}

/**
 * Adds a file inside the upload/$type/id.
 *
 * @param string $type
 * @param array  $file
 * @param int    $itemId
 * @param string $cropParameters
 * @deprecated use Resources
 *
 * @return array|bool
 */
function api_upload_file($type, $file, $itemId, $cropParameters = '')
{
    $upload = process_uploaded_file($file);
    if ($upload) {
        $name = api_replace_dangerous_char($file['name']);

        // No "dangerous" files
        $name = disable_dangerous_file($name);

        $pathId = '/'.substr((string) $itemId, 0, 1).'/'.$itemId.'/';
        $path = api_get_path(SYS_UPLOAD_PATH).$type.$pathId;

        if (!is_dir($path)) {
            mkdir($path, api_get_permissions_for_new_directories(), true);
        }

        $pathToSave = $path.$name;
        $result = moveUploadedFile($file, $pathToSave);

        if ($result) {
            if (!empty($cropParameters)) {
                $image = new Image($pathToSave);
                $image->crop($cropParameters);
            }

            return ['path_to_save' => $pathId.$name];
        }

        return false;
    }
}

/**
 * @param string $type
 * @param int    $itemId
 * @param string $file
 *
 * @return bool
 */
function api_get_uploaded_web_url($type, $itemId, $file)
{
    return api_get_uploaded_file($type, $itemId, $file, true);
}

/**
 * @param string $type
 * @param int    $itemId
 * @param string $file
 * @param bool   $getUrl
 *
 * @return bool
 */
function api_get_uploaded_file($type, $itemId, $file, $getUrl = false)
{
    $itemId = (int) $itemId;
    $pathId = '/'.substr((string) $itemId, 0, 1).'/'.$itemId.'/';
    $path = api_get_path(SYS_UPLOAD_PATH).$type.$pathId;
    $file = basename($file);
    $file = $path.'/'.$file;
    if (Security::check_abs_path($file, $path) && is_file($file) && file_exists($file)) {
        if ($getUrl) {
            return str_replace(api_get_path(SYS_UPLOAD_PATH), api_get_path(WEB_UPLOAD_PATH), $file);
        }

        return $file;
    }

    return false;
}

/**
 * @param string $type
 * @param int    $itemId
 * @param string $file
 * @param string $title
 */
function api_download_uploaded_file($type, $itemId, $file, $title = '')
{
    $file = api_get_uploaded_file($type, $itemId, $file);
    if ($file) {
        if (Security::check_abs_path($file, api_get_path(SYS_UPLOAD_PATH).$type)) {
            DocumentManager::file_send_for_download($file, true, $title);
            exit;
        }
    }
    api_not_allowed(true);
}

/**
 * @param string $type
 * @param string $file
 */
function api_remove_uploaded_file($type, $file)
{
    $typePath = api_get_path(SYS_UPLOAD_PATH).$type;
    $path = $typePath.'/'.$file;
    if (Security::check_abs_path($path, $typePath) && file_exists($path) && is_file($path)) {
        unlink($path);
    }
}

/**
 * @param string $type
 * @param int    $itemId
 * @param string $file
 *
 * @return bool
 */
function api_remove_uploaded_file_by_id($type, $itemId, $file)
{
    $file = api_get_uploaded_file($type, $itemId, $file, false);
    $typePath = api_get_path(SYS_UPLOAD_PATH).$type;
    if (Security::check_abs_path($file, $typePath) && file_exists($file) && is_file($file)) {
        unlink($file);

        return true;
    }

    return false;
}

/**
 * Converts string value to float value.
 *
 * 3.141516 => 3.141516
 * 3,141516 => 3.141516
 *
 * @todo WIP
 *
 * @param string $number
 *
 * @return float
 */
function api_float_val($number)
{
    $number = (float) str_replace(',', '.', trim($number));

    return $number;
}

/**
 * Converts float values
 * Example if $decimals = 2.
 *
 * 3.141516 => 3.14
 * 3,141516 => 3,14
 *
 * @param string $number            number in iso code
 * @param int    $decimals
 * @param string $decimalSeparator
 * @param string $thousandSeparator
 *
 * @return bool|string
 */
function api_number_format($number, $decimals = 0, $decimalSeparator = '.', $thousandSeparator = ',')
{
    $number = api_float_val($number);

    return number_format($number, $decimals, $decimalSeparator, $thousandSeparator);
}

/**
 * Set location url with a exit break by default.
 *
 * @param $url
 * @param bool $exit
 */
function location($url, $exit = true)
{
    header('Location: '.$url);

    if ($exit) {
        exit;
    }
}

/**
 * @return string
 */
function api_get_web_url()
{
    if (api_get_setting('server_type') === 'test') {
        return api_get_path(WEB_PATH).'web/app_dev.php/';
    } else {
        return api_get_path(WEB_PATH).'web/';
    }
}

/**
 * @param string $from
 * @param string $to
 *
 * @return string
 */
function api_get_relative_path($from, $to)
{
    // some compatibility fixes for Windows paths
    $from = is_dir($from) ? rtrim($from, '\/').'/' : $from;
    $to = is_dir($to) ? rtrim($to, '\/').'/' : $to;
    $from = str_replace('\\', '/', $from);
    $to = str_replace('\\', '/', $to);

    $from = explode('/', $from);
    $to = explode('/', $to);
    $relPath = $to;

    foreach ($from as $depth => $dir) {
        // find first non-matching dir
        if ($dir === $to[$depth]) {
            // ignore this directory
            array_shift($relPath);
        } else {
            // get number of remaining dirs to $from
            $remaining = count($from) - $depth;
            if ($remaining > 1) {
                // add traversals up to first matching dir
                $padLength = (count($relPath) + $remaining - 1) * -1;
                $relPath = array_pad($relPath, $padLength, '..');
                break;
            } else {
                $relPath[0] = './'.$relPath[0];
            }
        }
    }

    return implode('/', $relPath);
}

/**
 * Unserialize content using Brummann\Polyfill\Unserialize.
 *
 * @param string $type
 * @param string $serialized
 * @param bool   $ignoreErrors. Optional.
 *
 * @return mixed
 */
function api_unserialize_content($type, $serialized, $ignoreErrors = false)
{
    switch ($type) {
        case 'career':
        case 'sequence_graph':
            $allowedClasses = [Graph::class, VerticesMap::class, Vertices::class, Edges::class];
            break;
        case 'lp':
            $allowedClasses = [
                learnpath::class,
                learnpathItem::class,
                aicc::class,
                aiccBlock::class,
                aiccItem::class,
                aiccObjective::class,
                aiccResource::class,
                scorm::class,
                scormItem::class,
                scormMetadata::class,
                scormOrganization::class,
                scormResource::class,
                Link::class,
                LpItem::class,
            ];
            break;
        case 'course':
            $allowedClasses = [
                Course::class,
                Announcement::class,
                Attendance::class,
                CalendarEvent::class,
                CourseCopyLearnpath::class,
                CourseCopyTestCategory::class,
                CourseDescription::class,
                CourseSession::class,
                Document::class,
                Forum::class,
                ForumCategory::class,
                ForumPost::class,
                ForumTopic::class,
                Glossary::class,
                GradeBookBackup::class,
                Link::class,
                LinkCategory::class,
                Quiz::class,
                QuizQuestion::class,
                QuizQuestionOption::class,
                ScormDocument::class,
                Survey::class,
                SurveyInvitation::class,
                SurveyQuestion::class,
                Thematic::class,
                ToolIntro::class,
                Wiki::class,
                Work::class,
                stdClass::class,
            ];
            break;
        case 'not_allowed_classes':
        default:
            $allowedClasses = false;
    }

    if ($ignoreErrors) {
        return @Unserialize::unserialize(
            $serialized,
            ['allowed_classes' => $allowedClasses]
        );
    }

    return Unserialize::unserialize(
        $serialized,
        ['allowed_classes' => $allowedClasses]
    );
}

/**
 * @param string $template
 *
 * @return string
 */
function api_find_template($template)
{
    return Template::findTemplateFilePath($template);
}

/**
 * @return array
 */
function api_get_language_list_for_flag()
{
    $table = Database::get_main_table(TABLE_MAIN_LANGUAGE);
    $sql = "SELECT english_name, isocode FROM $table 
            ORDER BY original_name ASC";
    static $languages = [];
    if (empty($languages)) {
        $result = Database::query($sql);
        while ($row = Database::fetch_array($result)) {
            $languages[$row['english_name']] = $row['isocode'];
        }
        $languages['english'] = 'gb';
    }

    return $languages;
}

/**
 * @param string $name
 *
 * @return \ZipStream\ZipStream
 */
function api_create_zip($name)
{
    $zipStreamOptions = new \ZipStream\Option\Archive();
    $zipStreamOptions->setSendHttpHeaders(true);
    $zipStreamOptions->setContentDisposition('attachment');
    $zipStreamOptions->setContentType('application/x-zip');

    $zip = new \ZipStream\ZipStream($name, $zipStreamOptions);

    return $zip;
}

/**
 * @return string
 */
function api_get_language_translate_html()
{
    $translate = api_get_configuration_value('translate_html');

    if (!$translate) {
        return '';
    }

    $languageList = api_get_languages();
    $hideAll = '';
    foreach ($languageList['all'] as $language) {
        $hideAll .= '
        $("span:lang('.$language['isocode'].')").filter(
            function(e, val) {
                // Only find the spans if they have set the lang                
                if ($(this).attr("lang") == null) {                
                    return false;
                }
                
                // Ignore ckeditor classes
                return !this.className.match(/cke(.*)/);
        }).hide();'."\n";
    }

    $userInfo = api_get_user_info();
    $languageId = api_get_language_id($userInfo['language']);
    $languageInfo = api_get_language_info($languageId);
    $isoCode = 'en';

    if (!empty($languageInfo)) {
        $isoCode = $languageInfo['isocode'];
    }

    return '
            $(function() {
                '.$hideAll.'                 
                var defaultLanguageFromUser = "'.$isoCode.'";   
                                             
                $("span:lang('.$isoCode.')").filter(
                    function() {
                        // Ignore ckeditor classes
                        return !this.className.match(/cke(.*)/);
                }).show();
                
                var defaultLanguage = "";
                var langFromUserFound = false;
                
                $(this).find("span").filter(
                    function() {
                        // Ignore ckeditor classes
                        return !this.className.match(/cke(.*)/);
                }).each(function() {
                    defaultLanguage = $(this).attr("lang");                            
                    if (defaultLanguage) {
                        $(this).before().next("br").remove();                
                        if (defaultLanguageFromUser == defaultLanguage) {
                            langFromUserFound = true;
                        }
                    }
                });
                
                // Show default language
                if (langFromUserFound == false && defaultLanguage) {
                    $("span:lang("+defaultLanguage+")").filter(
                    function() {
                            // Ignore ckeditor classes
                            return !this.className.match(/cke(.*)/);
                    }).show();
                }
            });
    ';
}
