chamilo-lms2/main/inc/lib/text.lib.php

<?php
/* For licensing terms, see /license.txt */
/**
 * This is the text library for Chamilo.
 * It is loaded during the global initialization,
 * so the functions below are available everywhere.
 *
 * @package chamilo.library
 */

define('EXERCISE_NUMBER_OF_DECIMALS', 2);

/**
 * This function strips all html-tags found in the input string and outputs a pure text.
 * Mostly, the function is to be used before language or encoding detection of the input string.
 * @param  string $string    The input string with html-tags to be converted to plain text.
 * @return string            The returned plain text as a result.
 */
function api_html_to_text($string)
{
    // These purifications have been found experimentally, for nice looking output.
    $string = preg_replace('/<br[^>]*>/i', "\n", $string);
    $string = preg_replace('/<\/?(div|p|h[1-6]|table|ol|ul|blockquote)[^>]*>/i', "\n", $string);
    $string = preg_replace('/<\/(tr|li)[^>]*>/i', "\n", $string);
    $string = preg_replace('/<\/(td|th)[^>]*>/i', "\t", $string);

    $string = strip_tags($string);

    // Line endings unification and cleaning.
    $string = str_replace(array("\r\n", "\n\r", "\r"), "\n", $string);
    $string = preg_replace('/\s*\n/', "\n", $string);
    $string = preg_replace('/\n+/', "\n", $string);

    return trim($string);
}

/**
 * Detects encoding of html-formatted text.
 * @param  string $string                The input html-formatted text.
 * @return string                        Returns the detected encoding.
 */
function api_detect_encoding_html($string) {
    if (@preg_match('/<head.*(<meta[^>]*content=[^>]*>).*<\/head>/si', $string, $matches)) {
        if (@preg_match('/<meta[^>]*charset=(.*)["\';][^>]*>/si', $matches[1], $matches)) {
            return api_refine_encoding_id(trim($matches[1]));
        }
    }
    return api_detect_encoding(api_html_to_text($string));
}

/**
 * Converts the text of a html-document to a given encoding, the meta-tag is changed accordingly.
 * @param string $string                The input full-html document.
 * @param string                        The new encoding value to be set.
 */
function api_set_encoding_html(&$string, $encoding) {
    $old_encoding = api_detect_encoding_html($string);
    if (@preg_match('/(.*<head.*)(<meta[^>]*content=[^>]*>)(.*<\/head>.*)/si', $string, $matches)) {
        $meta = $matches[2];
        if (@preg_match("/(<meta[^>]*charset=)(.*)([\"';][^>]*>)/si", $meta, $matches1)) {
            $meta = $matches1[1] . $encoding . $matches1[3];
            $string = $matches[1] . $meta . $matches[3];
        } else {
            $string = $matches[1] . '<meta http-equiv="Content-Type" content="text/html; charset='.$encoding.'"/>' . $matches[3];
        }
    } else {
        $count = 1;
        $string = str_ireplace('</head>', '<meta http-equiv="Content-Type" content="text/html; charset='.$encoding.'"/></head>', $string, $count);
    }
    $string = api_convert_encoding($string, $encoding, $old_encoding);
}

/**
 * Returns the title of a html document.
 * @param string $string                The contents of the input document.
 * @param string $input_encoding        The encoding of the input document. If the value is not set, it is detected.
 * @param string $$output_encoding      The encoding of the retrieved title. If the value is not set, the system encoding is assumend.
 * @return string                       The retrieved title, html-entities and extra-whitespace between the words are cleaned.
 */
function api_get_title_html(&$string, $output_encoding = null, $input_encoding = null) {
    if (@preg_match('/<head.+<title[^>]*>(.*)<\/title>/msi', $string, $matches)) {
        if (empty($output_encoding)) {
            $output_encoding = api_get_system_encoding();
        }
        if (empty($input_encoding)) {
            $input_encoding = api_detect_encoding_html($string);
        }
        return trim(@preg_replace('/\s+/', ' ', api_html_entity_decode(api_convert_encoding($matches[1], $output_encoding, $input_encoding), ENT_QUOTES, $output_encoding)));
    }
    return '';
}


/* XML processing functions */

// A regular expression for accessing declared encoding within xml-formatted text.
// Published by Steve Minutillo,
// http://minutillo.com/steve/weblog/2004/6/17/php-xml-and-character-encodings-a-tale-of-sadness-rage-and-data-loss/
define('_PCRE_XML_ENCODING', '/<\?xml.*encoding=[\'"](.*?)[\'"].*\?>/m');

/**
 * Detects encoding of xml-formatted text.
 * @param string $string                The input xml-formatted text.
 * @param string $default_encoding      This is the default encoding to be returned if there is no way the xml-text's encoding to be detected. If it not spesified, the system encoding is assumed then.
 * @return string                       Returns the detected encoding.
 * @todo The second parameter is to be eliminated. See api_detect_encoding_html().
 */
function api_detect_encoding_xml($string, $default_encoding = null) {
    if (preg_match(_PCRE_XML_ENCODING, $string, $matches)) {
        return api_refine_encoding_id($matches[1]);
    }
    if (api_is_valid_utf8($string)) {
        return 'UTF-8';
    }
    if (empty($default_encoding)) {
        $default_encoding = _api_mb_internal_encoding();
    }
    return api_refine_encoding_id($default_encoding);
}


/**
 * Converts character encoding of a xml-formatted text. If inside the text the encoding is declared, it is modified accordingly.
 * @param string $string                    The text being converted.
 * @param string $to_encoding               The encoding that text is being converted to.
 * @param string $from_encoding (optional)  The encoding that text is being converted from. If it is omited, it is tried to be detected then.
 * @return string                           Returns the converted xml-text.
 */
function api_convert_encoding_xml($string, $to_encoding, $from_encoding = null) {
    return _api_convert_encoding_xml($string, $to_encoding, $from_encoding);
}

/**
 * Converts character encoding of a xml-formatted text into UTF-8. If inside the text the encoding is declared, it is set to UTF-8.
 * @param string $string                    The text being converted.
 * @param string $from_encoding (optional)  The encoding that text is being converted from. If it is omited, it is tried to be detected then.
 * @return string                           Returns the converted xml-text.
 */
function api_utf8_encode_xml($string, $from_encoding = null) {
    return _api_convert_encoding_xml($string, 'UTF-8', $from_encoding);
}

/**
 * Converts character encoding of a xml-formatted text from UTF-8 into a specified encoding. If inside the text the encoding is declared, it is modified accordingly.
 * @param string $string                    The text being converted.
 * @param string $to_encoding (optional)    The encoding that text is being converted to. If it is omited, the platform character set is assumed.
 * @return string                           Returns the converted xml-text.
 */
function api_utf8_decode_xml($string, $to_encoding = null) {
    if (empty($to_encoding)) {
        $to_encoding = _api_mb_internal_encoding();
    }
    return _api_convert_encoding_xml($string, $to_encoding, 'UTF-8');
}

/**
 * Converts character encoding of a xml-formatted text. If inside the text the encoding is declared, it is modified accordingly.
 * @param string $string                    The text being converted.
 * @param string $to_encoding               The encoding that text is being converted to.
 * @param string $from_encoding (optional)  The encoding that text is being converted from. If the value is empty, it is tried to be detected then.
 * @return string                           Returns the converted xml-text.
 */
function _api_convert_encoding_xml(&$string, $to_encoding, $from_encoding) {
    if (empty($from_encoding)) {
        $from_encoding = api_detect_encoding_xml($string);
    }
    $to_encoding = api_refine_encoding_id($to_encoding);
    if (!preg_match('/<\?xml.*\?>/m', $string, $matches)) {
        return api_convert_encoding('<?xml version="1.0" encoding="'.$to_encoding.'"?>'."\n".$string, $to_encoding, $from_encoding);
    }
    if (!preg_match(_PCRE_XML_ENCODING, $string)) {
        if (strpos($matches[0], 'standalone') !== false) {
            // The encoding option should precede the standalone option, othewise DOMDocument fails to load the document.
            $replace = str_replace('standalone', ' encoding="'.$to_encoding.'" standalone' , $matches[0]);
        } else {
            $replace = str_replace('?>', ' encoding="'.$to_encoding.'"?>' , $matches[0]);
        }
        return api_convert_encoding(str_replace($matches[0], $replace, $string), $to_encoding, $from_encoding);
    }
    global $_api_encoding;
    $_api_encoding = api_refine_encoding_id($to_encoding);
    return api_convert_encoding(preg_replace_callback(_PCRE_XML_ENCODING, '_api_convert_encoding_xml_callback', $string), $to_encoding, $from_encoding);
}

/**
 * A callback for serving the function _api_convert_encoding_xml().
 * @param array $matches    Input array of matches corresponding to the xml-declaration.
 * @return string           Returns the xml-declaration with modified encoding.
 */
function _api_convert_encoding_xml_callback($matches) {
    global $_api_encoding;
    return str_replace($matches[1], $_api_encoding, $matches[0]);
}


/* CSV processing functions */

/**
 * Parses CSV data (one line) into an array. This function is not affected by the OS-locale settings.
 * @param string $string                  The input string.
 * @param string $delimiter (optional)    The field delimiter, one character only. The default delimiter character is comma {,).
 * @param string $enclosure (optional)    The field enclosure, one character only. The default enclosure character is quote (").
 * @param string $escape (optional)       The escape character, one character only. The default escape character is backslash (\).
 * @return array                          Returns an array containing the fields read.
 * Note: In order this function to work correctly with UTF-8, limitation for the parameters $delimiter, $enclosure and $escape
 * should be kept. These parameters should be single ASCII characters only. Thus the implementation of this function is faster.
 * @link http://php.net/manual/en/function.str-getcsv.php   (exists as of PHP 5 >= 5.3.0)
 */
function & api_str_getcsv(& $string, $delimiter = ',', $enclosure = '"', $escape = '\\') {
    $delimiter = (string)$delimiter;
    if (api_byte_count($delimiter) > 1) { $delimiter = $delimiter[1]; }
    $enclosure = (string)$enclosure;
    if (api_byte_count($enclosure) > 1) { $enclosure = $enclosure[1]; }
    $escape = (string)$escape;
    if (api_byte_count($escape) > 1) { $escape = $escape[1]; }
    $str = (string)$string;
    $len = api_byte_count($str);
    $enclosed = false;
    $escaped = false;
    $value = '';
    $result = array();

    for ($i = 0; $i < $len; $i++) {
        $char = $str[$i];
        if ($char == $escape) {
            if (!$escaped) {
                $escaped = true;
                continue;
            }
        }
        $escaped = false;
        switch ($char) {
            case $enclosure:
                if ($enclosed && $str[$i + 1] == $enclosure) {
                    $value .= $char;
                    $i++;
                } else {
                    $enclosed = !$enclosed;
                }
                break;
            case $delimiter:
                if (!$enclosed) {
                    $result[] = $value;
                    $value = '';
                } else {
                    $value .= $char;
                }
                break;
            default:
                $value .= $char;
                break;
        }
    }
    if (!empty($value)) {
        $result[] = $value;
    }

    return $result;
}

/**
 * Reads a line from a file pointer and parses it for CSV fields. This function is not affected by the OS-locale settings.
 * @param resource $handle                The file pointer, it must be valid and must point to a file successfully opened by fopen().
 * @param int $length (optional)          Reading ends when length - 1 bytes have been read, on a newline (which is included in the return value), or on EOF (whichever comes first).
 *                                        If no length is specified, it will keep reading from the stream until it reaches the end of the line.
 * @param string $delimiter (optional)    The field delimiter, one character only. The default delimiter character is comma {,).
 * @param string $enclosure (optional)    The field enclosure, one character only. The default enclosure character is quote (").
 * @param string $escape (optional)       The escape character, one character only. The default escape character is backslash (\).
 * @return array                          Returns an array containing the fields read.
 * Note: In order this function to work correctly with UTF-8, limitation for the parameters $delimiter, $enclosure and $escape
 * should be kept. These parameters should be single ASCII characters only.
 * @link http://php.net/manual/en/function.fgetcsv.php
 */
function api_fgetcsv($handle, $length = null, $delimiter = ',', $enclosure = '"', $escape = '\\') {
    if (($line = is_null($length) ? fgets($handle): fgets($handle, $length)) !== false) {
        $line = rtrim($line, "\r\n");
        return api_str_getcsv($line, $delimiter, $enclosure, $escape);
    }
    return false;
}


/* Functions for supporting ASCIIMathML mathematical formulas and ASCIIsvg maathematical graphics */

/**
 * Dectects ASCIIMathML formula presence within a given html text.
 * @param string $html      The input html text.
 * @return bool             Returns TRUE when there is a formula found or FALSE otherwise.
 */
function api_contains_asciimathml($html) {
    if (!preg_match_all('/<span[^>]*class\s*=\s*[\'"](.*?)[\'"][^>]*>/mi', $html, $matches)) {
        return false;
    }
    foreach ($matches[1] as $string) {
        $string = ' '.str_replace(',', ' ', $string).' ';
        if (preg_match('/\sAM\s/m', $string)) {
            return true;
        }
    }
    return false;
}

/**
 * Dectects ASCIIsvg graphics presence within a given html text.
 * @param string $html      The input html text.
 * @return bool             Returns TRUE when there is a graph found or FALSE otherwise.
 */
function api_contains_asciisvg($html) {
    if (!preg_match_all('/<embed([^>]*?)>/mi', $html, $matches)) {
        return false;
    }
    foreach ($matches[1] as $string) {
        $string = ' '.str_replace(',', ' ', $string).' ';
        if (preg_match('/sscr\s*=\s*[\'"](.*?)[\'"]/m', $string)) {
            return true;
        }
    }
    return false;
}

/* Miscellaneous text processing functions */

/**
 * Convers a string from camel case into underscore.
 * Works correctly with ASCII strings only, implementation for human-language strings is not necessary.
 * @param string $string                            The input string (ASCII)
 * @return string                                   The converted result string
 */
function api_camel_case_to_underscore($string) {
    return strtolower(preg_replace('/([a-z])([A-Z])/', "$1_$2", $string));
}

/**
 * Converts a string with underscores into camel case.
 * Works correctly with ASCII strings only, implementation for human-language strings is not necessary.
 * @param string $string                            The input string (ASCII)
 * @param bool $capitalise_first_char (optional)    If true (default), the function capitalises the first char in the result string.
 * @return string                                   The converted result string
 */
function api_underscore_to_camel_case($string, $capitalise_first_char = true) {
    if ($capitalise_first_char) {
        $string = ucfirst($string);
    }
    return preg_replace_callback('/_([a-z])/', '_api_camelize', $string);
}

// A function for internal use, only for this library.
function _api_camelize($match) {
    return strtoupper($match[1]);
}

/**
 * Truncates a string.
 *
 * @author Brouckaert Olivier
 * @param  string $text                  The text to truncate.
 * @param  integer $length               The approximate desired length. The length of the suffix below is to be added to have the total length of the result string.
 * @param  string $suffix                A suffix to be added as a replacement.
 * @param string $encoding (optional)    The encoding to be used. If it is omitted, the platform character set will be used by default.
 * @param  boolean $middle               If this parameter is true, truncation is done in the middle of the string.
 * @return string                        Truncated string, decorated with the given suffix (replacement).
 */
function api_trunc_str($text, $length = 30, $suffix = '...', $middle = false, $encoding = null) {
    if (empty($encoding)) {
        $encoding = api_get_system_encoding();
    }
    $text_length = api_strlen($text, $encoding);
    if ($text_length <= $length) {
        return $text;
    }
    if ($middle) {
        return rtrim(api_substr($text, 0, round($length / 2), $encoding)).$suffix.ltrim(api_substr($text, - round($length / 2), $text_length, $encoding));
    }
    return rtrim(api_substr($text, 0, $length, $encoding)).$suffix;
}

/**
 * Handling simple and double apostrofe in order that strings be stored properly in database
 *
 * @author Denes Nagy
 * @param  string variable - the variable to be revised
 */
function domesticate($input) {
    $input = stripslashes($input);
    $input = str_replace("'", "''", $input);
    $input = str_replace('"', "''", $input);
    return ($input);
}

/**
 * function make_clickable($string)
 *
 * @desc   Completes url contained in the text with "<a href ...".
 *         However the function simply returns the submitted text without any
 *         transformation if it already contains some "<a href:" or "<img src=".
 * @param string $text text to be converted
 * @return text after conversion
 * @author Rewritten by Nathan Codding - Feb 6, 2001.
 *         completed by Hugues Peeters - July 22, 2002
 *
 * Actually this function is taken from the PHP BB 1.4 script
 * - Goes through the given string, and replaces xxxx://yyyy with an HTML <a> tag linking
 *     to that URL
 * - Goes through the given string, and replaces www.xxxx.yyyy[zzzz] with an HTML <a> tag linking
 *     to http://www.xxxx.yyyy[/zzzz]
 * - Goes through the given string, and replaces xxxx@yyyy with an HTML mailto: tag linking
 *        to that email address
 * - Only matches these 2 patterns either after a space, or at the beginning of a line
 *
 * Notes: the email one might get annoying - it's easy to make it more restrictive, though.. maybe
 * have it require something like xxxx@yyyy.zzzz or such. We'll see.
 */

function make_clickable($string) {
    // TODO: eregi_replace() is deprecated as of PHP 5.3
    if (!stristr($string, ' src=') && !stristr($string, ' href=')) {
        $string = eregi_replace("(https?|ftp)://([a-z0-9#?/&=._+:~%-]+)", "<a href=\"\\1://\\2\" target=\"_blank\">\\1://\\2</a>", $string);
        $string = eregi_replace("([a-z0-9_.-]+@[a-z0-9.-]+)", "<a href=\"mailto:\\1\">\\1</a>", $string);
    }
    return $string;
}

/**
 * @desc This function does some parsing on the text that gets inputted. This parsing can be of any kind
 *       LaTeX notation, Word Censoring, Glossary Terminology (extension will available soon), Musical Notations, ...
 *       The inspiration for this filter function came from Moodle an phpBB who both use a similar approach.
 * <code>[tex]\sqrt(2)[/tex]</code>
 * @param $input string. some text
 * @return $output string. some text that contains the parsed elements.
 * @author Patrick Cool <patrick.cool@UGent.be>
 * @version March 2OO6
 */
function text_filter($input, $filter = true) {

    //$input = stripslashes($input);

    if ($filter) {
        // ***  parse [tex]...[/tex] tags  *** //
        // which will return techexplorer or image html depending on the capabilities of the
        // browser of the user (using some javascript that checks if the browser has the TechExplorer plugin installed or not)
        //$input = _text_parse_tex($input);

        // *** parse [teximage]...[/teximage] tags *** //
        // these force the gif rendering of LaTeX using the mimetex gif renderer
        //$input=_text_parse_tex_image($input);

        // *** parse [texexplorer]...[/texexplorer] tags  *** //
        // these force the texeplorer LaTeX notation
        //$input = _text_parse_texexplorer($input);

        // *** Censor Words *** //
        // censor words. This function removes certain words by [censored]
        // this can be usefull when the campus is open to the world.
        // $input=text_censor_words($input);

        // *** parse [?]...[/?] tags *** //
        // for the glossary tool
        //$input = _text_parse_glossary($input);

        // parse [wiki]...[/wiki] tags
        // this is for the coolwiki plugin.
        // $input=text_parse_wiki($input);

        // parse [tool]...[/tool] tags
        // this parse function adds a link to a certain tool
        // $input=text_parse_tool($input);

        // parse [user]...[/user] tags

        // parse [email]...[/email] tags

        // parse [code]...[/code] tags
    }

    return $input;
}

/**
 * Applies parsing for tex commands that are separated by [tex]
 * [/tex] to make it readable for techexplorer plugin.
 * This function should not be accessed directly but should be accesse through the text_filter function
 * @param string $text    The text to parse
 * @return string         The text after parsing.
 * @author Patrick Cool <patrick.cool@UGent.be>
 * @version June 2004
 */
function _text_parse_tex($textext) {
    //$textext = str_replace(array ("[tex]", "[/tex]"), array ('[*****]', '[/*****]'), $textext);
    //$textext = stripslashes($texttext);

    $input_array = preg_split("/(\[tex]|\[\/tex])/", $textext, -1, PREG_SPLIT_DELIM_CAPTURE);

    foreach ($input_array as $key => $value) {
        if ($key > 0 && $input_array[$key - 1] == '[tex]' AND $input_array[$key + 1] == '[/tex]') {
            $input_array[$key] = latex_gif_renderer($value);
            unset($input_array[$key - 1]);
            unset($input_array[$key + 1]);
            //echo 'LaTeX: <embed type="application/x-techexplorer" texdata="'.stripslashes($value).'" autosize="true" pluginspage="http://www.integretechpub.com/techexplorer/"><br />';
        }
    }

    $output = implode('',$input_array);
    return $output;
}

/**
 * This function should not be accessed directly but should be accesse through the text_filter function
 * @author     Patrick Cool <patrick.cool@UGent.be>
 */
function _text_parse_glossary($input) {
    return $input;
}

/**
 * @desc This function makes a valid link to a different tool.
 *       This function should not be accessed directly but should be accesse through the text_filter function
 * @author Patrick Cool <patrick.cool@UGent.be>
 */
function _text_parse_tool($input) {
    // An array with all the valid tools
    $tools[] = array(TOOL_ANNOUNCEMENT, 'announcements/announcements.php');
    $tools[] = array(TOOL_CALENDAR_EVENT, 'calendar/agenda.php');

    // Check if the name between the [tool] [/tool] tags is a valid one
}

/**
 * Renders LaTeX code into a gif or retrieve a cached version of the gif.
 * @author Patrick Cool <patrick.cool@UGent.be> Ghent University
 */
function latex_gif_renderer($latex_code) {
    global $_course;

    // Setting the paths and filenames
    $mimetex_path = api_get_path(LIBRARY_PATH).'mimetex/';
    $temp_path = api_get_path(SYS_COURSE_PATH).$_course['path'].'/temp/';
    $latex_filename = md5($latex_code).'.gif';

    if (!file_exists($temp_path.$latex_filename) OR isset($_GET['render'])) {
        if (IS_WINDOWS_OS) {
            $mimetex_command = $mimetex_path.'mimetex.exe -e "'.$temp_path.md5($latex_code).'.gif" '.escapeshellarg($latex_code).'';
        } else {
            $mimetex_command = $mimetex_path.'mimetex.cgi -e "'.$temp_path.md5($latex_code).'.gif" '.escapeshellarg($latex_code);
        }
        exec($mimetex_command);
        //echo 'volgende shell commando werd uitgevoerd:<br /><pre>'.$mimetex_command.'</pre><hr>';
    }

    $return  = "<a href=\"\" onclick=\"javascript: newWindow=window.open('".api_get_path(WEB_CODE_PATH)."inc/latex.php?code=".urlencode($latex_code)."&amp;filename=$latex_filename','latexCode','toolbar=no,location=no,scrollbars=yes,resizable=yes,status=yes,width=375,height=250,left=200,top=100');\">";
    $return .= '<img src="'.api_get_path(WEB_COURSE_PATH).$_course['path'].'/temp/'.$latex_filename.'" alt="'.$latex_code.'" border="0" /></a>';
    return $return;
}

/**
 * This functions cuts a paragraph
 * i.e cut('Merry Xmas from Lima',13) = "Merry Xmas fr..."
 * @param string    The text to "cut"
 * @param int       Count of chars
 * @param bool      Whether to embed in a <span title="...">...</span>
 * @return string
 * */
function cut($text, $maxchar, $embed = false) {
    if (api_strlen($text) > $maxchar) {
        if ($embed) {
            return '<span title="'.$text.'">'.api_substr($text, 0, $maxchar).'...</span>';
        }
        return api_substr($text, 0, $maxchar).' ...';
    }
    return $text;
}

/**
 * Show a number as only integers if no decimals, but will show 2 decimals if exist.
 *
 * @param mixed     Number to convert
 * @param int       Decimal points 0=never, 1=if needed, 2=always
 * @return mixed    An integer or a float depends on the parameter
 */
function float_format($number, $flag = 1) {
    if (is_numeric($number)) {
        if (!$number) {
            $result = ($flag == 2 ? '0.'.str_repeat('0', EXERCISE_NUMBER_OF_DECIMALS) : '0');
        } else {

            if (floor($number) == $number) {
                $result = number_format($number, ($flag == 2 ? EXERCISE_NUMBER_OF_DECIMALS : 0));
            } else {
                $result = number_format(round($number, 2), ($flag == 0 ? 0 : EXERCISE_NUMBER_OF_DECIMALS));
            }
        }
        return $result;
    }
}

// TODO: To be checked for correct timezone management.
/**
 * Function to obtain last week timestamps
 * @return array    Times for every day inside week
 */
function get_last_week() {
    $week = date('W');
    $year = date('Y');

    $lastweek = $week - 1;
    if ($lastweek == 0) {
        $week = 52;
        $year--;
    }

    $lastweek = sprintf("%02d", $lastweek);
    $arrdays = array();
    for ($i = 1; $i <= 7; $i++) {
        $arrdays[] = strtotime("$year"."W$lastweek"."$i");
    }
    return $arrdays;
}

/**
 * Gets the week from a day
 * @param   string   Date in UTC (2010-01-01 12:12:12)
 * @return  int      Returns an integer with the week number of the year
 */
function get_week_from_day($date) {
    if (!empty($date)) {
       $time = api_strtotime($date,'UTC');
       return date('W', $time);
    } else {
        return date('W');
    }
}


/**
 * Deprecated functions
 */

/**
 * Applies parsing the content for tex commands that are separated by [tex]
 * [/tex] to make it readable for techexplorer plugin.
 * @param string $text    The text to parse
 * @return string         The text after parsing.
 * @author Patrick Cool <patrick.cool@UGent.be>
 * @version June 2004
 */
function api_parse_tex($textext) {
    /*
    if (strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== false) {
        return str_replace(array('[tex]', '[/tex]'), array("<object classid=\"clsid:5AFAB315-AD87-11D3-98BB-002035EFB1A4\"><param name=\"autosize\" value=\"true\" /><param name=\"DataType\" value=\"0\" /><param name=\"Data\" value=\"", "\" /></object>"), $textext);
    }
    return str_replace(array('[tex]', '[/tex]'), array("<embed type=\"application/x-techexplorer\" texdata=\"", "\" autosize=\"true\" pluginspage=\"http://www.integretechpub.com/techexplorer/\">"), $textext);
    */
    return $textext;
}

/**
 * Applies parsing for tex commandos that are seperated by [tex]
 * [/tex] to make it readable for techexplorer plugin.
 * This function should not be accessed directly but should be accesse through the text_filter function
 * @param string $text    The text to parse
 * @return string         The text after parsing.
 * @author Patrick Cool <patrick.cool@UGent.be>
 * @version June 2004
 */
function _text_parse_texexplorer($textext) {
    /*
    if (strstr($_SERVER['HTTP_USER_AGENT'], 'MSIE')) {
        $textext = str_replace(array("[texexplorer]", "[/texexplorer]"), array("<object classid=\"clsid:5AFAB315-AD87-11D3-98BB-002035EFB1A4\"><param name=\"autosize\" value=\"true\" /><param name=\"DataType\" value=\"0\" /><param name=\"Data\" value=\"", "\" /></object>"), $textext);
    } else {
        $textext = str_replace(array("[texexplorer]", "[/texexplorer]"), array("<embed type=\"application/x-techexplorer\" texdata=\"", "\" autosize=\"true\" pluginspage=\"http://www.integretechpub.com/techexplorer/\">"), $textext);
    }
    return $textext;
    */
    return $textext;
}

/**
 * This function splits the string into words and then joins them back together again one by one.
 * Example: "Test example of a long string"
 * 			substrwords(5) = Test ... *
 * @param string
 * @param int the max number of character
 * @param string how the string will be end
 * @return a reduce string
 */

function substrwords($text,$maxchar,$end='...')
{
	if(strlen($text)>$maxchar)
	{
		$words=explode(" ",$text);
		$output = '';
		$i=0;
		while(1)
		{
			$length = (strlen($output)+strlen($words[$i]));
			if($length>$maxchar)
			{
				break;
			}
			else
			{
				$output = $output." ".$words[$i];
				$i++;
			};
		};
	}
	else
	{
		$output = $text;
		return $output;
	}
	return $output.$end;
}

function implode_with_key($glue, $array) {
    if (!empty($array)) {
        $string = '';
        foreach($array as $key => $value) {
            if (empty($value)) {
                $value = 'null';
            }
            $string .= $key." : ".$value." $glue ";
        }
        return $string;
    }
    return '';
}


/**
 * Transform the file size in a human readable format.
 *
 * @param  int  $file_size    Size of the file in bytes
 * @return string A human readable representation of the file size
 */
function format_file_size($file_size)
{
    $file_size = intval($file_size);
    if ($file_size >= 1073741824) {
        $file_size = round($file_size / 1073741824 * 100) / 100 . 'G';
    } elseif($file_size >= 1048576) {
        $file_size = round($file_size / 1048576 * 100) / 100 . 'M';
    } elseif($file_size >= 1024) {
        $file_size = round($file_size / 1024 * 100) / 100 . 'k';
    } else {
        $file_size = $file_size . 'B';
    }
    return $file_size;
}

function return_datetime_from_array($array)
{
    $year	 = '0000';
    $month = $day = $hours = $minutes = $seconds = '00';
    if (isset($array['Y']) && (isset($array['F']) || isset($array['M']))  && isset($array['d']) && isset($array['H']) && isset($array['i'])) {
        $year = $array['Y'];
        $month = isset($array['F'])?$array['F']:$array['M'];
        if (intval($month) < 10 ) $month = '0'.$month;
        $day = $array['d'];
        if (intval($day) < 10 ) $day = '0'.$day;
        $hours = $array['H'];
        if (intval($hours) < 10 ) $hours = '0'.$hours;
        $minutes = $array['i'];
        if (intval($minutes) < 10 ) $minutes = '0'.$minutes;
    }
    if (checkdate($month,$day,$year)) {
        $datetime = $year.'-'.$month.'-'.$day.' '.$hours.':'.$minutes.':'.$seconds;
    }
    return $datetime;
}

/**
 * Converts an string CLEANYO[admin][amann,acostea]
 * into an array:
 *
 * array(
 *  CLEANYO
 *  admin
 *  amann,acostea
 * )
 *
 * @param $array
 * @return array
 */
function bracketsToArray($array)
{
    return preg_split('/[\[\]]+/', $array, -1, PREG_SPLIT_NO_EMPTY);
}