chamilo-lms2/main/inc/lib/browser/Browser.php

<?php
/**
 * File: Browser.php
 * Author: Chris Schuld (http://chrisschuld.com/)
 * Last Modified: August 20th, 2010
 * @version 1.9
 *
 * Copyright (C) 2008-2010 Chris Schuld  (chris@chrisschuld.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details at:
 * http://www.gnu.org/copyleft/gpl.html
 *
 *
 * Typical Usage:
 *
 *   $browser = new Browser();
 *   if( $browser->getBrowser() == Browser::BROWSER_FIREFOX && $browser->getVersion() >= 2 ) {
 *   	echo 'You have FireFox version 2 or greater';
 *   }
 *
 * User Agents Sampled from: http://www.useragentstring.com/
 *
 * This implementation is based on the original work from Gary White
 * http://apptools.com/phptools/browser/
 *
 * UPDATES:
 *
 * 2010-08-20 (v1.9):
 *  + Added MSN Explorer Browser (legacy)
 *  + Added Bing/MSN Robot (Thanks Rob MacDonald)
 *  + Added the Android Platform (PLATFORM_ANDROID)
 *  + Fixed issue with Android 1.6/2.2 (Thanks Tom Hirashima)
 *
 * 2010-04-27 (v1.8):
 *  + Added iPad Support
 *
 * 2010-03-07 (v1.7):
 *  + *MAJOR* Rebuild (preg_match and other "slow" routine removal(s))
 *  + Almost allof Gary's original code has been replaced
 *  + Large PHPUNIT testing environment created to validate new releases and additions
 *  + Added FreeBSD Platform
 *  + Added OpenBSD Platform
 *  + Added NetBSD Platform
 *  + Added SunOS Platform
 *  + Added OpenSolaris Platform
 *  + Added support of the Iceweazel Browser
 *  + Added isChromeFrame() call to check if chromeframe is in use
 *  + Moved the Opera check in front of the Firefox check due to legacy Opera User Agents
 *  + Added the __toString() method (Thanks Deano)
 *
 * 2009-11-15:
 *  + Updated the checkes for Firefox
 *  + Added the NOKIA platform
 *  + Added Checks for the NOKIA brower(s)
 *  
 * 2009-11-08:
 *  + PHP 5.3 Support
 *  + Added support for BlackBerry OS and BlackBerry browser
 *  + Added support for the Opera Mini browser
 *  + Added additional documenation
 *  + Added support for isRobot() and isMobile()
 *  + Added support for Opera version 10
 *  + Added support for deprecated Netscape Navigator version 9
 *  + Added support for IceCat
 *  + Added support for Shiretoko
 *
 * 2010-04-27 (v1.8):
 *  + Added iPad Support
 *
 * 2009-08-18:
 *  + Updated to support PHP 5.3 - removed all deprecated function calls
 *  + Updated to remove all double quotes (") -- converted to single quotes (')
 *
 * 2009-04-27:
 *  + Updated the IE check to remove a typo and bug (thanks John)
 *
 * 2009-04-22:
 *  + Added detection for GoogleBot
 *  + Added detection for the W3C Validator.
 *  + Added detection for Yahoo! Slurp
 *
 * 2009-03-14:
 *  + Added detection for iPods.
 *  + Added Platform detection for iPhones
 *  + Added Platform detection for iPods
 *
 * 2009-02-16: (Rick Hale)
 *  + Added version detection for Android phones.
 *
 * 2008-12-09:
 *  + Removed unused constant
 *
 * 2008-11-07:
 *  + Added Google's Chrome to the detection list
 *  + Added isBrowser(string) to the list of functions special thanks to
 *    Daniel 'mavrick' Lang for the function concept (http://mavrick.id.au)
 *
 *
 * Gary White noted: "Since browser detection is so unreliable, I am
 * no longer maintaining this script. You are free to use and or
 * modify/update it as you want, however the author assumes no
 * responsibility for the accuracy of the detected values."
 *
 * Anyone experienced with Gary's script might be interested in these notes:
 *
 *   Added class constants
 *   Added detection and version detection for Google's Chrome
 *   Updated the version detection for Amaya
 *   Updated the version detection for Firefox
 *   Updated the version detection for Lynx
 *   Updated the version detection for WebTV
 *   Updated the version detection for NetPositive
 *   Updated the version detection for IE
 *   Updated the version detection for OmniWeb
 *   Updated the version detection for iCab
 *   Updated the version detection for Safari
 *   Updated Safari to remove mobile devices (iPhone)
 *   Added detection for iPhone
 *   Added detection for robots
 *   Added detection for mobile devices
 *   Added detection for BlackBerry
 *   Removed Netscape checks (matches heavily with firefox & mozilla)
 *
 * @package chamilo.browser
 */

class Browser {
	private $_agent = '';
	private $_browser_name = '';
	private $_version = '';
	private $_platform = '';
	private $_os = '';
	private $_is_aol = false;
	private $_is_mobile = false;
	private $_is_robot = false;
	private $_aol_version = '';

	const BROWSER_UNKNOWN = 'unknown';
	const VERSION_UNKNOWN = 'unknown';

	const BROWSER_OPERA = 'Opera';                            // http://www.opera.com/
	const BROWSER_OPERA_MINI = 'Opera Mini';                  // http://www.opera.com/mini/
	const BROWSER_WEBTV = 'WebTV';                            // http://www.webtv.net/pc/
	const BROWSER_IE = 'Internet Explorer';                   // http://www.microsoft.com/ie/
	const BROWSER_POCKET_IE = 'Pocket Internet Explorer';     // http://en.wikipedia.org/wiki/Internet_Explorer_Mobile
	const BROWSER_KONQUEROR = 'Konqueror';                    // http://www.konqueror.org/
	const BROWSER_ICAB = 'iCab';                              // http://www.icab.de/
	const BROWSER_OMNIWEB = 'OmniWeb';                        // http://www.omnigroup.com/applications/omniweb/
	const BROWSER_FIREBIRD = 'Firebird';                      // http://www.ibphoenix.com/
	const BROWSER_FIREFOX = 'Firefox';                        // http://www.mozilla.com/en-US/firefox/firefox.html
	const BROWSER_ICEWEASEL = 'Iceweasel';                    // http://www.geticeweasel.org/
	const BROWSER_SHIRETOKO = 'Shiretoko';                    // http://wiki.mozilla.org/Projects/shiretoko
	const BROWSER_MOZILLA = 'Mozilla';                        // http://www.mozilla.com/en-US/
	const BROWSER_AMAYA = 'Amaya';                            // http://www.w3.org/Amaya/
	const BROWSER_LYNX = 'Lynx';                              // http://en.wikipedia.org/wiki/Lynx
	const BROWSER_SAFARI = 'Safari';                          // http://apple.com
	const BROWSER_IPHONE = 'iPhone';                          // http://apple.com
	const BROWSER_IPOD = 'iPod';                              // http://apple.com
	const BROWSER_IPAD = 'iPad';                              // http://apple.com
	const BROWSER_CHROME = 'Chrome';                          // http://www.google.com/chrome
	const BROWSER_ANDROID = 'Android';                        // http://www.android.com/
	const BROWSER_GOOGLEBOT = 'GoogleBot';                    // http://en.wikipedia.org/wiki/Googlebot
	const BROWSER_SLURP = 'Yahoo! Slurp';                     // http://en.wikipedia.org/wiki/Yahoo!_Slurp
	const BROWSER_W3CVALIDATOR = 'W3C Validator';             // http://validator.w3.org/
	const BROWSER_BLACKBERRY = 'BlackBerry';                  // http://www.blackberry.com/
	const BROWSER_ICECAT = 'IceCat';                          // http://en.wikipedia.org/wiki/GNU_IceCat
	const BROWSER_NOKIA_S60 = 'Nokia S60 OSS Browser';        // http://en.wikipedia.org/wiki/Web_Browser_for_S60
	const BROWSER_NOKIA = 'Nokia Browser';                    // * all other WAP-based browsers on the Nokia Platform
	const BROWSER_MSN = 'MSN Browser';                        // http://explorer.msn.com/
	const BROWSER_MSNBOT = 'MSN Bot';                         // http://search.msn.com/msnbot.htm
	                                                          // http://en.wikipedia.org/wiki/Msnbot  (used for Bing as well)
	
	const BROWSER_NETSCAPE_NAVIGATOR = 'Netscape Navigator';  // http://browser.netscape.com/ (DEPRECATED)
	const BROWSER_GALEON = 'Galeon';                          // http://galeon.sourceforge.net/ (DEPRECATED)
	const BROWSER_NETPOSITIVE = 'NetPositive';                // http://en.wikipedia.org/wiki/NetPositive (DEPRECATED)
	const BROWSER_PHOENIX = 'Phoenix';                        // http://en.wikipedia.org/wiki/History_of_Mozilla_Firefox (DEPRECATED)

	const PLATFORM_UNKNOWN = 'unknown';
	const PLATFORM_WINDOWS = 'Windows';
	const PLATFORM_WINDOWS_CE = 'Windows CE';
	const PLATFORM_APPLE = 'Apple';
	const PLATFORM_LINUX = 'Linux';
	const PLATFORM_OS2 = 'OS/2';
	const PLATFORM_BEOS = 'BeOS';
	const PLATFORM_IPHONE = 'iPhone';
	const PLATFORM_IPOD = 'iPod';
	const PLATFORM_IPAD = 'iPad';
	const PLATFORM_BLACKBERRY = 'BlackBerry';
	const PLATFORM_NOKIA = 'Nokia';
	const PLATFORM_FREEBSD = 'FreeBSD';
	const PLATFORM_OPENBSD = 'OpenBSD';
	const PLATFORM_NETBSD = 'NetBSD';
	const PLATFORM_SUNOS = 'SunOS';
	const PLATFORM_OPENSOLARIS = 'OpenSolaris';
	const PLATFORM_ANDROID = 'Android';
	
	const OPERATING_SYSTEM_UNKNOWN = 'unknown';

	public function Browser($useragent="") {
		$this->reset();
		if( $useragent != "" ) {
			$this->setUserAgent($useragent);
		}
		else {
			$this->determine();
		}
	}

	/**
	* Reset all properties
	*/
	public function reset() {
		$this->_agent = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : "";
		$this->_browser_name = self::BROWSER_UNKNOWN;
		$this->_version = self::VERSION_UNKNOWN;
		$this->_platform = self::PLATFORM_UNKNOWN;
		$this->_os = self::OPERATING_SYSTEM_UNKNOWN;
		$this->_is_aol = false;
		$this->_is_mobile = false;
		$this->_is_robot = false;
		$this->_aol_version = self::VERSION_UNKNOWN;
	}

	/**
	* Check to see if the specific browser is valid
	* @param string $browserName
	* @return True if the browser is the specified browser
	*/
	function isBrowser($browserName) { return( 0 == strcasecmp($this->_browser_name, trim($browserName))); }

	/**
	* The name of the browser.  All return types are from the class contants
	* @return string Name of the browser
	*/
	public function getBrowser() { return $this->_browser_name; }
	/**
	* Set the name of the browser
	* @param $browser The name of the Browser
	*/
	public function setBrowser($browser) { return $this->_browser_name = $browser; }
	/**
	* The name of the platform.  All return types are from the class contants
	* @return string Name of the browser
	*/
	public function getPlatform() { return $this->_platform; }
	/**
	* Set the name of the platform
	* @param $platform The name of the Platform
	*/
	public function setPlatform($platform) { return $this->_platform = $platform; }
	/**
	* The version of the browser.
	* @return string Version of the browser (will only contain alpha-numeric characters and a period)
	*/
	public function getVersion() { return $this->_version; }
	/**
	* Set the version of the browser
	* @param $version The version of the Browser
	*/
	public function setVersion($version) { $this->_version = preg_replace('/[^0-9,.,a-z,A-Z-]/','',$version); }
	/**
	* The version of AOL.
	* @return string Version of AOL (will only contain alpha-numeric characters and a period)
	*/
	public function getAolVersion() { return $this->_aol_version; }
	/**
	* Set the version of AOL
	* @param $version The version of AOL
	*/
	public function setAolVersion($version) { $this->_aol_version = preg_replace('/[^0-9,.,a-z,A-Z]/','',$version); }
	/**
	* Is the browser from AOL?
	* @return boolean True if the browser is from AOL otherwise false
	*/
	public function isAol() { return $this->_is_aol; }
	/**
	* Is the browser from a mobile device?
	* @return boolean True if the browser is from a mobile device otherwise false
	*/
	public function isMobile() { return $this->_is_mobile; }
	/**
	* Is the browser from a robot (ex Slurp,GoogleBot)?
	* @return boolean True if the browser is from a robot otherwise false
	*/
	public function isRobot() { return $this->_is_robot; }
	/**
	* Set the browser to be from AOL
	* @param $isAol
	*/
	public function setAol($isAol) { $this->_is_aol = $isAol; }
	/**
	 * Set the Browser to be mobile
	 * @param boolean $value is the browser a mobile brower or not
	 */
	protected function setMobile($value=true) { $this->_is_mobile = $value; }
	/**
	 * Set the Browser to be a robot
	 * @param boolean $value is the browser a robot or not
	 */
	protected function setRobot($value=true) { $this->_is_robot = $value; }
	/**
	* Get the user agent value in use to determine the browser
	* @return string The user agent from the HTTP header
	*/
	public function getUserAgent() { return $this->_agent; }
	/**
	* Set the user agent value (the construction will use the HTTP header value - this will overwrite it)
	* @param $agent_string The value for the User Agent
	*/
	public function setUserAgent($agent_string) {
		$this->reset();
		$this->_agent = $agent_string;
		$this->determine();
	}
	/**
	 * Used to determine if the browser is actually "chromeframe"
	 * @since 1.7
	 * @return boolean True if the browser is using chromeframe
	 */
	public function isChromeFrame() {
		return( strpos($this->_agent,"chromeframe") !== false );
	}
	/**
	* Returns a formatted string with a summary of the details of the browser.
	* @return string formatted string with a summary of the browser
	*/
	public function __toString() {
		return "<strong>Browser Name:</strong>{$this->getBrowser()}<br/>\n" .
		       "<strong>Browser Version:</strong>{$this->getVersion()}<br/>\n" .
		       "<strong>Browser User Agent String:</strong>{$this->getUserAgent()}<br/>\n" .
		       "<strong>Platform:</strong>{$this->getPlatform()}<br/>";
	}
	/**
	 * Protected routine to calculate and determine what the browser is in use (including platform)
	 */
	protected function determine() {
		$this->checkPlatform();
		$this->checkBrowsers();
		$this->checkForAol();
	}
	/**
	 * Protected routine to determine the browser type
	 * @return boolean True if the browser was detected otherwise false
	 */
	 protected function checkBrowsers() {
		return (
			// well-known, well-used
			// Special Notes:
			// (1) Opera must be checked before FireFox due to the odd
			//     user agents used in some older versions of Opera
			// (2) WebTV is strapped onto Internet Explorer so we must
			//     check for WebTV before IE
			// (3) (deprecated) Galeon is based on Firefox and needs to be
			//     tested before Firefox is tested
			// (4) OmniWeb is based on Safari so OmniWeb check must occur
			//     before Safari
			// (5) Netscape 9+ is based on Firefox so Netscape checks
			//     before FireFox are necessary
			$this->checkBrowserWebTv() ||
			$this->checkBrowserInternetExplorer() ||
			$this->checkBrowserOpera() ||
			$this->checkBrowserGaleon() ||
			$this->checkBrowserNetscapeNavigator9Plus() ||
			$this->checkBrowserFirefox() ||
			$this->checkBrowserChrome() ||
			$this->checkBrowserOmniWeb() ||

			// common mobile
			$this->checkBrowserAndroid() ||
			$this->checkBrowseriPad() ||
			$this->checkBrowseriPod() ||
			$this->checkBrowseriPhone() ||
			$this->checkBrowserBlackBerry() ||
			$this->checkBrowserNokia() ||

			// common bots
			$this->checkBrowserGoogleBot() ||
			$this->checkBrowserMSNBot() ||
			$this->checkBrowserSlurp() ||

			// WebKit base check (post mobile and others)
			$this->checkBrowserSafari() ||
			
			// everyone else
			$this->checkBrowserNetPositive() ||
			$this->checkBrowserFirebird() ||
			$this->checkBrowserKonqueror() ||
			$this->checkBrowserIcab() ||
			$this->checkBrowserPhoenix() ||
			$this->checkBrowserAmaya() ||
			$this->checkBrowserLynx() ||
			$this->checkBrowserShiretoko() ||
			$this->checkBrowserIceCat() ||
			$this->checkBrowserW3CValidator() ||
			$this->checkBrowserMozilla() /* Mozilla is such an open standard that you must check it last */
		);
    }

    /**
     * Determine if the user is using a BlackBerry (last updated 1.7)
     * @return boolean True if the browser is the BlackBerry browser otherwise false
     */
    protected function checkBrowserBlackBerry() {
	    if( stripos($this->_agent,'blackberry') !== false ) {
		    $aresult = explode("/",stristr($this->_agent,"BlackBerry"));
		    $aversion = explode(' ',$aresult[1]);
		    $this->setVersion($aversion[0]);
		    $this->_browser_name = self::BROWSER_BLACKBERRY;
		    $this->setMobile(true);
		    return true;
	    }
	    return false;
    }

    /**
     * Determine if the user is using an AOL User Agent (last updated 1.7)
     * @return boolean True if the browser is from AOL otherwise false
     */
    protected function checkForAol() {
		$this->setAol(false);
		$this->setAolVersion(self::VERSION_UNKNOWN);

		if( stripos($this->_agent,'aol') !== false ) {
		    $aversion = explode(' ',stristr($this->_agent, 'AOL'));
		    $this->setAol(true);
		    $this->setAolVersion(preg_replace('/[^0-9\.a-z]/i', '', $aversion[1]));
		    return true;
	    }
	    return false;
    }

    /**
     * Determine if the browser is the GoogleBot or not (last updated 1.7)
     * @return boolean True if the browser is the GoogletBot otherwise false
     */
    protected function checkBrowserGoogleBot() {
	    if( stripos($this->_agent,'googlebot') !== false ) {
			$aresult = explode('/',stristr($this->_agent,'googlebot'));
			$aversion = explode(' ',$aresult[1]);
			$this->setVersion(str_replace(';','',$aversion[0]));
			$this->_browser_name = self::BROWSER_GOOGLEBOT;
			$this->setRobot(true);
			return true;
	    }
	    return false;
    }

	/**
     * Determine if the browser is the MSNBot or not (last updated 1.9)
     * @return boolean True if the browser is the MSNBot otherwise false
     */
	protected function checkBrowserMSNBot() {
		if( stripos($this->_agent,"msnbot") !== false ) {
			$aresult = explode("/",stristr($this->_agent,"msnbot"));
			$aversion = explode(" ",$aresult[1]);
			$this->setVersion(str_replace(";","",$aversion[0]));
			$this->_browser_name = self::BROWSER_MSNBOT;
			$this->setRobot(true);
			return true;
		}
		return false;
	}	    
    
    /**
     * Determine if the browser is the W3C Validator or not (last updated 1.7)
     * @return boolean True if the browser is the W3C Validator otherwise false
     */
    protected function checkBrowserW3CValidator() {
	    if( stripos($this->_agent,'W3C-checklink') !== false ) {
		    $aresult = explode('/',stristr($this->_agent,'W3C-checklink'));
		    $aversion = explode(' ',$aresult[1]);
		    $this->setVersion($aversion[0]);
		    $this->_browser_name = self::BROWSER_W3CVALIDATOR;
		    return true;
	    }
	    else if( stripos($this->_agent,'W3C_Validator') !== false ) {
			// Some of the Validator versions do not delineate w/ a slash - add it back in
			$ua = str_replace("W3C_Validator ", "W3C_Validator/", $this->_agent);
		    $aresult = explode('/',stristr($ua,'W3C_Validator'));
		    $aversion = explode(' ',$aresult[1]);
		    $this->setVersion($aversion[0]);
		    $this->_browser_name = self::BROWSER_W3CVALIDATOR;
		    return true;
	    }
	    return false;
    }

    /**
     * Determine if the browser is the Yahoo! Slurp Robot or not (last updated 1.7)
     * @return boolean True if the browser is the Yahoo! Slurp Robot otherwise false
     */
    protected function checkBrowserSlurp() {
	    if( stripos($this->_agent,'slurp') !== false ) {
		    $aresult = explode('/',stristr($this->_agent,'Slurp'));
		    $aversion = explode(' ',$aresult[1]);
		    $this->setVersion($aversion[0]);
		    $this->_browser_name = self::BROWSER_SLURP;
			$this->setRobot(true);
			$this->setMobile(false);
		    return true;
	    }
	    return false;
    }

    /**
     * Determine if the browser is Internet Explorer or not (last updated 1.7)
     * @return boolean True if the browser is Internet Explorer otherwise false
     */
    protected function checkBrowserInternetExplorer() {

	    // Test for v1 - v1.5 IE
	    if( stripos($this->_agent,'microsoft internet explorer') !== false ) {
		    $this->setBrowser(self::BROWSER_IE);
		    $this->setVersion('1.0');
		    $aresult = stristr($this->_agent, '/');
		    if( preg_match('/308|425|426|474|0b1/i', $aresult) ) {
			    $this->setVersion('1.5');
		    }
			return true;
	    }
	    // Test for versions > 1.5
	    else if( stripos($this->_agent,'msie') !== false && stripos($this->_agent,'opera') === false ) {
	    	// See if the browser is the odd MSN Explorer
	    	if( stripos($this->_agent,'msnb') !== false ) {
		    	$aresult = explode(' ',stristr(str_replace(';','; ',$this->_agent),'MSN'));
			    $this->setBrowser( self::BROWSER_MSN );
			    $this->setVersion(str_replace(array('(',')',';'),'',$aresult[1]));
			    return true;
	    	}
	    	$aresult = explode(' ',stristr(str_replace(';','; ',$this->_agent),'msie'));
	    	$this->setBrowser( self::BROWSER_IE );
	    	$this->setVersion(str_replace(array('(',')',';'),'',$aresult[1]));
	    	return true;
	    }
	    // Test for Pocket IE
	    else if( stripos($this->_agent,'mspie') !== false || stripos($this->_agent,'pocket') !== false ) {
		    $aresult = explode(' ',stristr($this->_agent,'mspie'));
		    $this->setPlatform( self::PLATFORM_WINDOWS_CE );
		    $this->setBrowser( self::BROWSER_POCKET_IE );
		    $this->setMobile(true);

		    if( stripos($this->_agent,'mspie') !== false ) {
			    $this->setVersion($aresult[1]);
		    }
		    else {
			    $aversion = explode('/',$this->_agent);
			    $this->setVersion($aversion[1]);
		    }
		    return true;
	    }
		return false;
    }

    /**
     * Determine if the browser is Opera or not (last updated 1.7)
     * @return boolean True if the browser is Opera otherwise false
     */
    protected function checkBrowserOpera() {
	    if( stripos($this->_agent,'opera mini') !== false ) {
		    $resultant = stristr($this->_agent, 'opera mini');
		    if( preg_match('/\//',$resultant) ) {
			    $aresult = explode('/',$resultant);
			    $aversion = explode(' ',$aresult[1]);
			    $this->setVersion($aversion[0]);
			}
		    else {
			    $aversion = explode(' ',stristr($resultant,'opera mini'));
			    $this->setVersion($aversion[1]);
		    }
		    $this->_browser_name = self::BROWSER_OPERA_MINI;
			$this->setMobile(true);
			return true;
	    }
	    else if( stripos($this->_agent,'opera') !== false ) {
		    $resultant = stristr($this->_agent, 'opera');
		    if( preg_match('/Version\/(10.*)$/',$resultant,$matches) ) {
			    $this->setVersion($matches[1]);
		    }
		    else if( preg_match('/\//',$resultant) ) {
			    $aresult = explode('/',str_replace("("," ",$resultant));
			    $aversion = explode(' ',$aresult[1]);
			    $this->setVersion($aversion[0]);
		    }
		    else {
			    $aversion = explode(' ',stristr($resultant,'opera'));
			    $this->setVersion(isset($aversion[1])?$aversion[1]:"");
		    }
		    $this->_browser_name = self::BROWSER_OPERA;
		    return true;
	    }
		return false;
    }

    /**
     * Determine if the browser is Chrome or not (last updated 1.7)
     * @return boolean True if the browser is Chrome otherwise false
     */
    protected function checkBrowserChrome() {
	    if( stripos($this->_agent,'Chrome') !== false ) {
		    $aresult = explode('/',stristr($this->_agent,'Chrome'));
		    $aversion = explode(' ',$aresult[1]);
		    $this->setVersion($aversion[0]);
		    $this->setBrowser(self::BROWSER_CHROME);
		    return true;
	    }
	    return false;
    }


    /**
     * Determine if the browser is WebTv or not (last updated 1.7)
     * @return boolean True if the browser is WebTv otherwise false
     */
    protected function checkBrowserWebTv() {
	    if( stripos($this->_agent,'webtv') !== false ) {
		    $aresult = explode('/',stristr($this->_agent,'webtv'));
		    $aversion = explode(' ',$aresult[1]);
		    $this->setVersion($aversion[0]);
		    $this->setBrowser(self::BROWSER_WEBTV);
		    return true;
	    }
	    return false;
    }

    /**
     * Determine if the browser is NetPositive or not (last updated 1.7)
     * @return boolean True if the browser is NetPositive otherwise false
     */
    protected function checkBrowserNetPositive() {
	    if( stripos($this->_agent,'NetPositive') !== false ) {
		    $aresult = explode('/',stristr($this->_agent,'NetPositive'));
		    $aversion = explode(' ',$aresult[1]);
		    $this->setVersion(str_replace(array('(',')',';'),'',$aversion[0]));
		    $this->setBrowser(self::BROWSER_NETPOSITIVE);
		    return true;
	    }
	    return false;
    }

    /**
     * Determine if the browser is Galeon or not (last updated 1.7)
     * @return boolean True if the browser is Galeon otherwise false
     */
    protected function checkBrowserGaleon() {
	    if( stripos($this->_agent,'galeon') !== false ) {
		    $aresult = explode(' ',stristr($this->_agent,'galeon'));
		    $aversion = explode('/',$aresult[0]);
		    $this->setVersion($aversion[1]);
		    $this->setBrowser(self::BROWSER_GALEON);
		    return true;
	    }
	    return false;
    }

    /**
     * Determine if the browser is Konqueror or not (last updated 1.7)
     * @return boolean True if the browser is Konqueror otherwise false
     */
    protected function checkBrowserKonqueror() {
	    if( stripos($this->_agent,'Konqueror') !== false ) {
		    $aresult = explode(' ',stristr($this->_agent,'Konqueror'));
		    $aversion = explode('/',$aresult[0]);
		    $this->setVersion($aversion[1]);
		    $this->setBrowser(self::BROWSER_KONQUEROR);
		    return true;
	    }
	    return false;
    }

    /**
     * Determine if the browser is iCab or not (last updated 1.7)
     * @return boolean True if the browser is iCab otherwise false
     */
    protected function checkBrowserIcab() {
	    if( stripos($this->_agent,'icab') !== false ) {
		    $aversion = explode(' ',stristr(str_replace('/',' ',$this->_agent),'icab'));
		    $this->setVersion($aversion[1]);
		    $this->setBrowser(self::BROWSER_ICAB);
		    return true;
	    }
	    return false;
    }

    /**
     * Determine if the browser is OmniWeb or not (last updated 1.7)
     * @return boolean True if the browser is OmniWeb otherwise false
     */
    protected function checkBrowserOmniWeb() {
	    if( stripos($this->_agent,'omniweb') !== false ) {
		    $aresult = explode('/',stristr($this->_agent,'omniweb'));
		    $aversion = explode(' ',isset($aresult[1])?$aresult[1]:"");
		    $this->setVersion($aversion[0]);
		    $this->setBrowser(self::BROWSER_OMNIWEB);
		    return true;
	    }
	    return false;
    }

    /**
     * Determine if the browser is Phoenix or not (last updated 1.7)
     * @return boolean True if the browser is Phoenix otherwise false
     */
    protected function checkBrowserPhoenix() {
	    if( stripos($this->_agent,'Phoenix') !== false ) {
		    $aversion = explode('/',stristr($this->_agent,'Phoenix'));
		    $this->setVersion($aversion[1]);
		    $this->setBrowser(self::BROWSER_PHOENIX);
		    return true;
	    }
	    return false;
    }

    /**
     * Determine if the browser is Firebird or not (last updated 1.7)
     * @return boolean True if the browser is Firebird otherwise false
     */
    protected function checkBrowserFirebird() {
	    if( stripos($this->_agent,'Firebird') !== false ) {
		    $aversion = explode('/',stristr($this->_agent,'Firebird'));
		    $this->setVersion($aversion[1]);
		    $this->setBrowser(self::BROWSER_FIREBIRD);
			return true;
	    }
	    return false;
    }

    /**
     * Determine if the browser is Netscape Navigator 9+ or not (last updated 1.7)
	 * NOTE: (http://browser.netscape.com/ - Official support ended on March 1st, 2008)
     * @return boolean True if the browser is Netscape Navigator 9+ otherwise false
     */
    protected function checkBrowserNetscapeNavigator9Plus() {
	    if( stripos($this->_agent,'Firefox') !== false && preg_match('/Navigator\/([^ ]*)/i',$this->_agent,$matches) ) {
		    $this->setVersion($matches[1]);
		    $this->setBrowser(self::BROWSER_NETSCAPE_NAVIGATOR);
		    return true;
	    }
	    else if( stripos($this->_agent,'Firefox') === false && preg_match('/Netscape6?\/([^ ]*)/i',$this->_agent,$matches) ) {
		    $this->setVersion($matches[1]);
		    $this->setBrowser(self::BROWSER_NETSCAPE_NAVIGATOR);
		    return true;
	    }
	    return false;
    }

    /**
     * Determine if the browser is Shiretoko or not (https://wiki.mozilla.org/Projects/shiretoko) (last updated 1.7)
     * @return boolean True if the browser is Shiretoko otherwise false
     */
    protected function checkBrowserShiretoko() {
	    if( stripos($this->_agent,'Mozilla') !== false && preg_match('/Shiretoko\/([^ ]*)/i',$this->_agent,$matches) ) {
		    $this->setVersion($matches[1]);
		    $this->setBrowser(self::BROWSER_SHIRETOKO);
		    return true;
	    }
	    return false;
    }

    /**
     * Determine if the browser is Ice Cat or not (http://en.wikipedia.org/wiki/GNU_IceCat) (last updated 1.7)
     * @return boolean True if the browser is Ice Cat otherwise false
     */
    protected function checkBrowserIceCat() {
	    if( stripos($this->_agent,'Mozilla') !== false && preg_match('/IceCat\/([^ ]*)/i',$this->_agent,$matches) ) {
		    $this->setVersion($matches[1]);
		    $this->setBrowser(self::BROWSER_ICECAT);
		    return true;
	    }
	    return false;
    }

    /**
     * Determine if the browser is Nokia or not (last updated 1.7)
     * @return boolean True if the browser is Nokia otherwise false
     */
    protected function checkBrowserNokia() {
	    if( preg_match("/Nokia([^\/]+)\/([^ SP]+)/i",$this->_agent,$matches) ) {
		    $this->setVersion($matches[2]);
			if( stripos($this->_agent,'Series60') !== false || strpos($this->_agent,'S60') !== false ) {
				$this->setBrowser(self::BROWSER_NOKIA_S60);
			}
			else {
				$this->setBrowser( self::BROWSER_NOKIA );
			}
		    $this->setMobile(true);
		    return true;
	    }
		return false;
    }

    /**
     * Determine if the browser is Firefox or not (last updated 1.7)
     * @return boolean True if the browser is Firefox otherwise false
     */
    protected function checkBrowserFirefox() {
	    if( stripos($this->_agent,'safari') === false ) {
			if( preg_match("/Firefox[\/ \(-]([^ ;\)]+)/i",$this->_agent,$matches) ) {
				$this->setVersion($matches[1]);
				$this->setBrowser(self::BROWSER_FIREFOX);
				return true;
			}
			else if( preg_match("/Firefox$/i",$this->_agent,$matches) ) {
				$this->setVersion("");
				$this->setBrowser(self::BROWSER_FIREFOX);
				return true;
			}
                else if( preg_match("/Namoroka[\/ \(-]([^ ;\)]+)/i",$this->_agent,$matches) ) {
                    $this->setVersion($matches[1]);
                    $this->setBrowser(self::BROWSER_FIREFOX);
                    return true;
                }
		}
	    return false;
    }

	/**
     * Determine if the browser is Firefox or not (last updated 1.7)
     * @return boolean True if the browser is Firefox otherwise false
     */
    protected function checkBrowserIceweasel() {
		if( stripos($this->_agent,'Iceweasel') !== false ) {
			$aresult = explode('/',stristr($this->_agent,'Iceweasel'));
			$aversion = explode(' ',$aresult[1]);
			$this->setVersion($aversion[0]);
			$this->setBrowser(self::BROWSER_ICEWEASEL);
			return true;
		}
		return false;
	}
    /**
     * Determine if the browser is Mozilla or not (last updated 1.7)
     * @return boolean True if the browser is Mozilla otherwise false
     */
    protected function checkBrowserMozilla() {
	    if( stripos($this->_agent,'mozilla') !== false  && preg_match('/rv:[0-9].[0-9][a-b]?/i',$this->_agent) && stripos($this->_agent,'netscape') === false) {
		    $aversion = explode(' ',stristr($this->_agent,'rv:'));
		    preg_match('/rv:[0-9].[0-9][a-b]?/i',$this->_agent,$aversion);
		    $this->setVersion(str_replace('rv:','',$aversion[0]));
		    $this->setBrowser(self::BROWSER_MOZILLA);
		    return true;
	    }
	    else if( stripos($this->_agent,'mozilla') !== false && preg_match('/rv:[0-9]\.[0-9]/i',$this->_agent) && stripos($this->_agent,'netscape') === false ) {
		    $aversion = explode('',stristr($this->_agent,'rv:'));
		    $this->setVersion(str_replace('rv:','',$aversion[0]));
		    $this->setBrowser(self::BROWSER_MOZILLA);
		    return true;
	    }
	    else if( stripos($this->_agent,'mozilla') !== false  && preg_match('/mozilla\/([^ ]*)/i',$this->_agent,$matches) && stripos($this->_agent,'netscape') === false ) {
		    $this->setVersion($matches[1]);
		    $this->setBrowser(self::BROWSER_MOZILLA);
		    return true;
	    }
		return false;
    }

    /**
     * Determine if the browser is Lynx or not (last updated 1.7)
     * @return boolean True if the browser is Lynx otherwise false
     */
    protected function checkBrowserLynx() {
	    if( stripos($this->_agent,'lynx') !== false ) {
		    $aresult = explode('/',stristr($this->_agent,'Lynx'));
		    $aversion = explode(' ',(isset($aresult[1])?$aresult[1]:""));
		    $this->setVersion($aversion[0]);
		    $this->setBrowser(self::BROWSER_LYNX);
		    return true;
	    }
	    return false;
    }

    /**
     * Determine if the browser is Amaya or not (last updated 1.7)
     * @return boolean True if the browser is Amaya otherwise false
     */
    protected function checkBrowserAmaya() {
	    if( stripos($this->_agent,'amaya') !== false ) {
		    $aresult = explode('/',stristr($this->_agent,'Amaya'));
		    $aversion = explode(' ',$aresult[1]);
		    $this->setVersion($aversion[0]);
		    $this->setBrowser(self::BROWSER_AMAYA);
		    return true;
	    }
	    return false;
    }

    /**
     * Determine if the browser is Safari or not (last updated 1.7)
     * @return boolean True if the browser is Safari otherwise false
     */
    protected function checkBrowserSafari() {
	    if( stripos($this->_agent,'Safari') !== false && stripos($this->_agent,'iPhone') === false && stripos($this->_agent,'iPod') === false ) {
		    $aresult = explode('/',stristr($this->_agent,'Version'));
		    if( isset($aresult[1]) ) {
			    $aversion = explode(' ',$aresult[1]);
			    $this->setVersion($aversion[0]);
		    }
		    else {
			    $this->setVersion(self::VERSION_UNKNOWN);
		    }
		    $this->setBrowser(self::BROWSER_SAFARI);
		    return true;
	    }
	    return false;
    }

    /**
     * Determine if the browser is iPhone or not (last updated 1.7)
     * @return boolean True if the browser is iPhone otherwise false
     */
    protected function checkBrowseriPhone() {
	    if( stripos($this->_agent,'iPhone') !== false ) {
		    $aresult = explode('/',stristr($this->_agent,'Version'));
		    if( isset($aresult[1]) ) {
			    $aversion = explode(' ',$aresult[1]);
			    $this->setVersion($aversion[0]);
		    }
		    else {
			    $this->setVersion(self::VERSION_UNKNOWN);
		    }
		    $this->setMobile(true);
		    $this->setBrowser(self::BROWSER_IPHONE);
		    return true;
	    }
	    return false;
    }

    /**
     * Determine if the browser is iPod or not (last updated 1.7)
     * @return boolean True if the browser is iPod otherwise false
     */
    protected function checkBrowseriPad() {
	    if( stripos($this->_agent,'iPad') !== false ) {
		    $aresult = explode('/',stristr($this->_agent,'Version'));
		    if( isset($aresult[1]) ) {
			    $aversion = explode(' ',$aresult[1]);
			    $this->setVersion($aversion[0]);
		    }
		    else {
			    $this->setVersion(self::VERSION_UNKNOWN);
		    }
		    $this->setMobile(true);
		    $this->setBrowser(self::BROWSER_IPAD);
		    return true;
	    }
	    return false;
    }

    /**
     * Determine if the browser is iPod or not (last updated 1.7)
     * @return boolean True if the browser is iPod otherwise false
     */
    protected function checkBrowseriPod() {
	    if( stripos($this->_agent,'iPod') !== false ) {
		    $aresult = explode('/',stristr($this->_agent,'Version'));
		    if( isset($aresult[1]) ) {
			    $aversion = explode(' ',$aresult[1]);
			    $this->setVersion($aversion[0]);
		    }
		    else {
			    $this->setVersion(self::VERSION_UNKNOWN);
		    }
		    $this->setMobile(true);
		    $this->setBrowser(self::BROWSER_IPOD);
		    return true;
	    }
	    return false;
    }

    /**
     * Determine if the browser is Android or not (last updated 1.7)
     * @return boolean True if the browser is Android otherwise false
     */
    protected function checkBrowserAndroid() {
	    if( stripos($this->_agent,'Android') !== false ) {
		    $aresult = explode(' ',stristr($this->_agent,'Android'));
		    if( isset($aresult[1]) ) {
			    $aversion = explode(' ',$aresult[1]);
			    $this->setVersion($aversion[0]);
		    }
		    else {
			    $this->setVersion(self::VERSION_UNKNOWN);
		    }
		    $this->setMobile(true);
		    $this->setBrowser(self::BROWSER_ANDROID);
		    return true;
	    }
	    return false;
    }

    /**
     * Determine the user's platform (last updated 1.7)
     */
    protected function checkPlatform() {
	    if( stripos($this->_agent, 'windows') !== false ) {
		    $this->_platform = self::PLATFORM_WINDOWS;
	    }
	    else if( stripos($this->_agent, 'iPad') !== false ) {
		    $this->_platform = self::PLATFORM_IPAD;
	    }
	    else if( stripos($this->_agent, 'iPod') !== false ) {
		    $this->_platform = self::PLATFORM_IPOD;
	    }
	    else if( stripos($this->_agent, 'iPhone') !== false ) {
		    $this->_platform = self::PLATFORM_IPHONE;
	    }
	    elseif( stripos($this->_agent, 'mac') !== false ) {
		    $this->_platform = self::PLATFORM_APPLE;
	    }
	    elseif( stripos($this->_agent, 'android') !== false ) {
		    $this->_platform = self::PLATFORM_ANDROID;
	    }
	    elseif( stripos($this->_agent, 'linux') !== false ) {
		    $this->_platform = self::PLATFORM_LINUX;
	    }
	    else if( stripos($this->_agent, 'Nokia') !== false ) {
		    $this->_platform = self::PLATFORM_NOKIA;
	    }
	    else if( stripos($this->_agent, 'BlackBerry') !== false ) {
		    $this->_platform = self::PLATFORM_BLACKBERRY;
	    }
	    elseif( stripos($this->_agent,'FreeBSD') !== false ) {
		    $this->_platform = self::PLATFORM_FREEBSD;
	    }
	    elseif( stripos($this->_agent,'OpenBSD') !== false ) {
		    $this->_platform = self::PLATFORM_OPENBSD;
	    }
	    elseif( stripos($this->_agent,'NetBSD') !== false ) {
		    $this->_platform = self::PLATFORM_NETBSD;
	    }
	    elseif( stripos($this->_agent, 'OpenSolaris') !== false ) {
		    $this->_platform = self::PLATFORM_OPENSOLARIS;
	    }
	    elseif( stripos($this->_agent, 'SunOS') !== false ) {
		    $this->_platform = self::PLATFORM_SUNOS;
	    }
	    elseif( stripos($this->_agent, 'OS\/2') !== false ) {
		    $this->_platform = self::PLATFORM_OS2;
	    }
	    elseif( stripos($this->_agent, 'BeOS') !== false ) {
		    $this->_platform = self::PLATFORM_BEOS;
	    }
	    elseif( stripos($this->_agent, 'win') !== false ) {
		    $this->_platform = self::PLATFORM_WINDOWS;
	    }

    }
}