<?php
/**
 * File: Browser.php
 * Author: Chris Schuld (http://chrisschuld.com/)
 * @modified: Viet Vu
 * Last Modified: August 20th, 2010
 * @version 1.9
 * @package PegasusPHP
 *
 * 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/
 *
 */
defined('_JEXEC') or die('Restricted access');

class CBrowser {

    /**
     *
     * @var string
     */
    private $_agent = '';

    /**
     *
     * @var string
     */
    private $_browser_name = '';

    /**
     *
     * @var string
     */
    private $_version = '';

    /**
     *
     * @var string
     */
    private $_majorVersion = '';

    /**
     *
     * @var string
     */
    private $_minorVersion = '';

    /**
     *
     * @var string
     */
    private $_platform = '';

    /**
     *
     * @var string
     * @todo OS detection
     */
    private $_os = '';

    /**
     *
     * @var string
     */
    private $_is_aol = false;

    /**
     *
     * @var string
     */
    private $_is_mobile = false;

    /**
     *
     * @var string
     */
    private $_is_tablet = false;

    /**
     *
     * @var string
     */
    private $_is_robot = false;

    /**
     *
     * @var string
     */
    private $_is_facebook = false;

    /**
     *
     * @var string
     */
    private $_aol_version = '';

    /**
     * @var    array  Known robots.
     */
    protected $_robots = array(
        /* The most common ones. */
        'Googlebot',
        'msnbot',
        'Slurp',
        'Yahoo',
        /* The rest alphabetically. */
        'Arachnoidea',
        'ArchitextSpider',
        'Ask Jeeves',
        'B-l-i-t-z-Bot',
        'Baiduspider',
        'BecomeBot',
        'cfetch',
        'ConveraCrawler',
        'ExtractorPro',
        'FAST-WebCrawler',
        'FDSE robot',
        'fido',
        'geckobot',
        'Gigabot',
        'Girafabot',
        'grub-client',
        'Gulliver',
        'HTTrack',
        'ia_archiver',
        'InfoSeek',
        'kinjabot',
        'KIT-Fireball',
        'larbin',
        'LEIA',
        'lmspider',
        'Lycos_Spider',
        'Mediapartners-Google',
        'MuscatFerret',
        'NaverBot',
        'OmniExplorer_Bot',
        'polybot',
        'Pompos',
        'Scooter',
        'Teoma',
        'TheSuBot',
        'TurnitinBot',
        'Ultraseek',
        'ViolaBot',
        'webbandit',
        'www.almaden.ibm.com/cs/crawler',
        'ZyBorg');

    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
    const BROWSER_BINGBOT = 'Bing Bot'; // http://en.wikipedia.org/wiki/Bingbot
    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';

    /**
     * Construct
     * @param type $userAgent
     */
    public function __construct($userAgent = "") {
        $this->reset();
        if ($userAgent != "") {
            $this->setUserAgent($userAgent);
        } else {
            $this->_determine();
        }
    }

    /**
     *
     * @staticvar type $instances
     * @param type $userAgent
     * @param type $accept
     * @return \CBrowser
     */
    public static function getInstance($userAgent = null, $accept = null) {
        static $instances;

        if (!isset($instances)) {
            $instances = array();
        }

        $signature = serialize(array($userAgent, $accept));

        if (empty($instances[$signature])) {
            $instances[$signature] = new CBrowser($userAgent);
        }

        return $instances[$signature];
    }

    /**
     * Reset all properties
     * @return \Browser
     */
    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_tablet = false;
        $this->_is_robot = false;
        $this->_is_facebook = false;
        $this->_aol_version = self::VERSION_UNKNOWN;
        return $this;
    }

    /**
     * Protected routine to calculate and determine what the browser is in use (including platform)
     */
    protected function _determine() {
        $this->_checkPlatform();
        $this->_checkBrowsers();
        $this->_checkForAol();

        $chunks = array(0,0,0);
        if(strstr($this->_version,'.')) $chunks = explode('.',$this->_version);

        list ($this->_majorVersion, $this->_minorVersion) = $chunks;
    }

    /**
     * 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;
        }
    }

    /**
     * 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->_checkBrowserBingBot() ||
                $this->_checkBrowserSlurp() ||
                // check for facebook external hit when loading URL
                $this->_checkFacebookExternalHit() ||
                // 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->_checkBrowserIceweasel() ||
                $this->_checkBrowserW3CValidator() ||
                $this->_checkBrowserMozilla() /* Mozilla is such an open standard that you must check it last */
                );
    }

    /**
     * Check to see if the specific browser is valid
     * @param string $browserName
     * @return bool True if the browser is the specified browser
     */
    public function isBrowser($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 $browser string The name of the Browser
     */
    public function setBrowser($browser) {
        $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 string $platform The name of the Platform
     */
    public function setPlatform($platform) {
        $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;
    }

    /**
     * Retrieve the current browser's major version.
     *
     * @return  integer  The current browser's major version
     *
     */
    public function getVersionMajor() {
        return $this->_majorVersion;
    }

    /**
     * Retrieve the current browser's minor version.
     *
     * @return  integer  The current browser's minor version.
     *
     * @since   11.1
     */
    public function getVersionMinor() {
        return $this->_minorVersion;
    }

    /**
     * Set the version of the browser
     * @param string $version The version of the Browser
     */
    public function setVersion($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 string $version The version of AOL
     */
    public function setAolVersion($version) {
        $this->_aol_version = preg_replace('/[^0-9,.,a-z,A-Z]/', '', $version);
    }

    /**
     * Set the browser to be from AOL
     * @param $isAol
     */
    public function setAol($isAol) {
        $this->_is_aol = $isAol;
    }

    /**
     * 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;
    }

    /**
     *
     * @return boolean
     */
    public function isDesktop() {
        return ($this->isMobile() === false && $this->isTablet() === false);
    }

    /**
     * Is the browser from a tablet device?
     * @return boolean True if the browser is from a tablet device otherwise false
     */
    public function isTablet() {
        return $this->_is_tablet;
    }

    /**
     * Is the browser from a robot (ex Slurp,GoogleBot)?
     * @return boolean True if the browser is from a robot otherwise false
     */
    public function isRobot() {
        /* Combine between robots array and our internal bot checking */
        foreach ($this->_robots as $robot) {
            if (strpos($this->_agent, $robot) !== false) {
                return (true && $this->_is_robot);
            }
        }
        return false;
    }

    /**
     * Is the browser from facebook?
     * @return boolean True if the browser is from facebook otherwise false
     */
    public function isFacebook() {
        return $this->_is_facebook;
    }

    /**
     * Set the Browser to be mobile
     * @param boolean $value is the browser a mobile browser or not
     */
    protected function _setMobile($value = true) {
        $this->_is_mobile = $value;
    }

    /**
     * Set the Browser to be tablet
     * @param boolean $value is the browser a tablet browser or not
     */
    protected function _setTablet($value = true) {
        $this->_is_tablet = $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;
    }

    /**
     * Set the Browser to be a Facebook request
     * @param boolean $value is the browser a robot or not
     */
    protected function _setFacebook($value = true) {
        $this->_is_facebook = $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 string $agent_string The value for the User Agent
     */
    public function setUserAgent($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/>";
    }

    /**
     * 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 BingBot or not (last updated 1.9)
     * @return boolean True if the browser is the BingBot otherwise false
     */
    protected function _checkBrowserBingBot() {
        if (stripos($this->_agent, "bingbot") !== false) {
            $aresult = explode("/", stristr($this->_agent, "bingbot"));
            $aversion = explode(" ", $aresult[1]);
            $this->setVersion(str_replace(";", "", $aversion[0]));
            $this->_browser_name = self::BROWSER_BINGBOT;
            $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]);
            $this->_browser_name = self::BROWSER_W3CVALIDATOR;
            return true;
        } else if (stripos($this->_agent, 'W3C-mobileOK') !== false) {
            $this->_browser_name = self::BROWSER_W3CVALIDATOR;
            $this->_setMobile(true);
            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('(', ')', ';'), '', $aresult[1]));
            if (stripos($this->_agent, 'IEMobile') !== false) {
                $this->setBrowser(self::BROWSER_POCKET_IE);
                $this->_setMobile(true);
            }
            return true;
        } // Test for versions > IE 10
        else if (stripos($this->_agent, 'trident') !== false) {
            $this->setBrowser(self::BROWSER_IE);
            $result = explode('rv:', $this->_agent);
            $this->setVersion(preg_replace('/[^0-9.]+/', '', $result[1]));
            $this->_agent = str_replace(array("Mozilla", "Gecko"), "MSIE", $this->_agent);
        } // Test for Pocket IE
        else if (stripos($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\/(1*.*)$/', $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]) ? $aversion[1] : "");
            }
            if (stripos($this->_agent, 'Opera Mobi') !== false) {
                $this->_setMobile(true);
            }
            $this->_browser_name = self::BROWSER_OPERA;
            return true;
        } else if (stripos($this->_agent, 'OPR') !== false) {
            $resultant = stristr($this->_agent, 'OPR');
            if (preg_match('/\//', $resultant)) {
                $aresult = explode('/', str_replace("(", " ", $resultant));
                $aversion = explode(' ', $aresult[1]);
                $this->setVersion($aversion[0]);
            }
            if (stripos($this->_agent, 'Mobile') !== false) {
                $this->_setMobile(true);
            }
            $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]);
            $this->setBrowser(self::BROWSER_CHROME);
            //Chrome on Android
            if (stripos($this->_agent, 'Android') !== false) {
                if (stripos($this->_agent, 'Mobile') !== false) {
                    $this->_setMobile(true);
                } else {
                    $this->_setTablet(true);
                }
            }
            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]);
                $this->setBrowser(self::BROWSER_FIREFOX);
                //Firefox on Android
                if (stripos($this->_agent, 'Android') !== false) {
                    if (stripos($this->_agent, 'Mobile') !== false) {
                        $this->_setMobile(true);
                    } else {
                        $this->_setTablet(true);
                    }
                }
                return true;
            } else if (preg_match("/Firefox$/i", $this->_agent, $matches)) {
                $this->setVersion("");
                $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;
    }

    /**
     * Detect if URL is loaded from FacebookExternalHit
     * @return boolean True if it detects FacebookExternalHit otherwise false
     */
    protected function _checkFacebookExternalHit() {
        if (stristr($this->_agent, 'FacebookExternalHit')) {
            $this->_setRobot(true);
            $this->_setFacebook(true);
            return true;
        }
        return false;
    }

    /**
     * Detect if URL is being loaded from internal Facebook browser
     * @return boolean True if it detects internal Facebook browser otherwise false
     */
    protected function _checkForFacebookIos() {
        if (stristr($this->_agent, 'FBIOS')) {
            $this->_setFacebook(true);
            return true;
        }
        return false;
    }

    /**
     * Detect Version for the Safari browser on iOS devices
     * @return boolean True if it detects the version correctly otherwise false
     */
    protected function _getSafariVersionOnIos() {
        $aresult = explode('/', stristr($this->_agent, 'Version'));
        if (isset($aresult[1])) {
            $aversion = explode(' ', $aresult[1]);
            $this->setVersion($aversion[0]);
            return true;
        }
        return false;
    }

    /**
     * Detect Version for the Chrome browser on iOS devices
     * @return boolean True if it detects the version correctly otherwise false
     */
    protected function _getChromeVersionOnIos() {
        $aresult = explode('/', stristr($this->_agent, 'CriOS'));
        if (isset($aresult[1])) {
            $aversion = explode(' ', $aresult[1]);
            $this->setVersion($aversion[0]);
            $this->setBrowser(self::BROWSER_CHROME);
            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) {
            $this->setVersion(self::VERSION_UNKNOWN);
            $this->setBrowser(self::BROWSER_IPHONE);
            $this->_getSafariVersionOnIos();
            $this->_getChromeVersionOnIos();
            $this->_checkForFacebookIos();
            $this->_setMobile(true);
            return true;
        }
        return false;
    }

    /**
     * Determine if the browser is iPad or not (last updated 1.7)
     * @return boolean True if the browser is iPad otherwise false
     */
    protected function _checkBrowseriPad() {
        if (stripos($this->_agent, 'iPad') !== false) {
            $this->setVersion(self::VERSION_UNKNOWN);
            $this->setBrowser(self::BROWSER_IPAD);
            $this->_getSafariVersionOnIos();
            $this->_getChromeVersionOnIos();
            $this->_checkForFacebookIos();
            $this->_setTablet(true);
            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) {
            $this->setVersion(self::VERSION_UNKNOWN);
            $this->setBrowser(self::BROWSER_IPOD);
            $this->_getSafariVersionOnIos();
            $this->_getChromeVersionOnIos();
            $this->_checkForFacebookIos();
            $this->_setMobile(true);
            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 {
                $this->setVersion(self::VERSION_UNKNOWN);
            }
            if (stripos($this->_agent, 'Mobile') !== false) {
                $this->_setMobile(true);
            } else {
                $this->_setTablet(true);
            }
            $this->setBrowser(self::BROWSER_ANDROID);
            return true;
        }
        return false;
    }

}

?>