<?php

/**
 * File: Browser.php
 * Author: Chris Schuld (http://chrisschuld.com/)
 * 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 = Browser::getInstance();
 *   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)
 *
 */
class Browser
{
    private $_agent = '';
    private $_browser_name = '';
    private $_version = '';
    private $_platform = '';
    private $_os = '';
    private $_ip = '';
    private $_is_new_generation = false;
    private $_is_html5 = false;
    private $_is_aol = false;
    private $_is_mobile = false;
    private $_is_tablet = false;
    private $_is_robot = false;
    private $_aol_version = '';
    private $_chrome_frame = false;
    private $_chrome_frame_version = false;
    private static $_instance;

    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';

    /**
     * @return browser
     */
    public static function getInstance()
    {
        if (!self::$_instance) {
            self::$_instance = new self();
        }

        return self::$_instance;
    }

    public function __construct()
    {
        $this->reset();
        $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_tablet = false;
        $this->_is_robot = false;
        $this->_aol_version = self::VERSION_UNKNOWN;
    }

    /**
     * Check to see if the specific browser is valid
     * @param  string $browserName
     * @return True   if the browser is the specified browser
     */
    public function isBrowser($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;
    }

    /**
     * The IP address of the client.
     * @return string IP address the browser
     */
    public function getIP()
    {
        return $this->_ip;
    }

    /**
     * Is new generation of Browser ? (Chrome, Safari, Webkit, Firefox, Opera ).
     * @return boolean
     */
    public function isNewGeneration()
    {
        return $this->_is_new_generation;
    }

    /**
     * Is HTML5 OK ?.
     * @return boolean
     */
    public function isHTML5()
    {
        return $this->_is_html5;
    }

    /**
     * Return true is the browser support the HTML5 File API
     *
     * @return boolean
     */
    public function supportFileAPI()
    {
        return $this->_is_html5 && ($this->_browser_name !== self::BROWSER_IE || $this->_version >= 10);
    }

    /**
     * Is the Browser very old  ?
     * @return boolean
     */
    public function isOldBrowser()
    {
        return $this->_is_old;
    }

    /**
     * Is the Browser using chrome frame ?
     * @return boolean
     */
    public function isChromeFrame()
    {
        return $this->_chrome_frame;
    }

    /**
     * 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;
    }

    /**
     * The extended version of the browser (include plugins).
     * @return string Version of the browser
     */
    public function getExtendedVersion()
    {
        return $this->getVersion() . ($this->isChromeFrame() ? ' ChromeFrame' : '');
    }

    public function getScreenSize()
    {
        return isset($_COOKIE['screen']) ? $_COOKIE['screen'] : 'unknown';
    }

    /**
     * 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 mobile device?
     * @return boolean True if the browser is from a mobile 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()
    {
        return $this->_is_robot;
    }

    /**
     * Set the browser to be from AOL
     * @param $isAol
     */
    public function setAol($isAol)
    {
        $this->_is_aol = $isAol;
    }

    /**
     * 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();
    }

    protected function setMobile($value = true)
    {
        $this->_is_mobile = $value;
    }

    protected function setTablet($value = true)
    {
        $this->_is_tablet = $value;
    }

    protected function setRobot($value = true)
    {
        $this->_is_robot = $value;
    }

    /**
     * Protected routine to calculate and determine what the browser is in use (including platform)
     */
    protected function determine()
    {
        $this->checkPlatform();
        $this->checkBrowsers();
        $this->checkForAol();
        $this->checkIP();
        $this->checkChromeFrame();
        $this->checkNewGeneration();
        $this->checkAge();
        $this->checkHTML5();
    }

    /**
     * Protected routine to determine if the browser is chrome frame enabled
     * @return boolean True if the browser was detected otherwise false
     */
    protected function checkChromeFrame()
    {

        $this->_chrome_frame = false;
        if (preg_match('/chromeframe/i', $this->_agent)) {
            $this->_chrome_frame = true;
            $aresult = explode('/', stristr($this->_agent, 'chromeframe'));
            $aversion = explode(' ', $aresult[1]);
            $chrome_version = explode('.', $aversion[0]);
            $this->_chrome_frame_version = $chrome_version[0];
        }

        return $this->_chrome_frame;
    }

    /**
     * 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->checkBrowserIceweasel() ||
            $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;
        } elseif (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(['(', ')', ';'], '', $aresult[1]));

                return true;
            }
            $aresult = explode(' ', stristr(str_replace(';', '; ', $this->_agent), 'msie'));
            $this->setBrowser(self::BROWSER_IE);
            $this->setVersion(str_replace(['(', ')', ';'], '', $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;
        } elseif (stripos($this->_agent, 'trident') !== false) {
            // >= IE 11
            $this->setBrowser(self::BROWSER_IE);

            // version
            $result = explode("rv:", $this->_agent);
            $this->setVersion(preg_replace("/[^0-9.]+/", "", $result[1]));

            // remove Gecko out of the user-agent, otherwise the mozilla check will success
            $this->_agent = str_replace(["Mozilla", "Gecko"], "MSIE", $this->_agent);
        }

        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;
        } elseif (stripos($this->_agent, 'opera') !== false) {
            $resultant = stristr($this->_agent, 'opera');
            if (preg_match('/Version\/([0-9]{2}.*)$/', $resultant, $matches)) {
                $this->setVersion($matches[1]);
            } elseif (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) {
            if (preg_match('/chrome\/([\.0-9]+) (mobile)?/i', $this->_agent, $matches)) {
                $this->setVersion($matches[1]);
                $this->setBrowser(self::BROWSER_CHROME);
                if (isset($matches[2])) {
                    $this->setMobile(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(['(', ')', ';'], '', $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;
        } elseif (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;
            } elseif (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;
        } elseif (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;
        } elseif (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->setTablet(true);
            $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) {
            $this->_platform = self::PLATFORM_WINDOWS;
        } elseif (stripos($this->_agent, 'iPad') !== false) {
            $this->_platform = self::PLATFORM_IPAD;
        } elseif (stripos($this->_agent, 'iPod') !== false) {
            $this->_platform = self::PLATFORM_IPOD;
        } elseif (stripos($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) {
            $this->_platform = self::PLATFORM_LINUX;
        } elseif (stripos($this->_agent, 'Nokia') !== false) {
            $this->_platform = self::PLATFORM_NOKIA;
        } elseif (stripos($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;
        }
    }

    /**
     * Check if is new generation
     */
    protected function checkNewGeneration()
    {
        $this->_is_new_generation = false;

        if (in_array($this->_browser_name, ['Opera', 'Internet Explorer', 'Firefox', 'Iceweasel', 'Safari', 'Chrome', 'iPhone', 'iPod'])) {
            switch ($this->_browser_name) {
                case 'Opera':
                    if ($this->_version >= 10)
                        $this->_is_new_generation = true;
                    break;
                case 'Internet Explorer':
                    if ($this->_version >= 7)
                        $this->_is_new_generation = true;
                    if ($this->_chrome_frame === true && $this->_chrome_frame_version >= 6)
                        $this->_is_new_generation = true;
                    break;
                case 'Firefox':
                case 'Iceweasel':
                    if ($this->_version >= 3)
                        $this->_is_new_generation = true;
                    break;
                case 'Safari':
                    if ($this->_version >= 4)
                        $this->_is_new_generation = true;
                    break;
                case 'Chrome':
                    if ($this->_version >= 4)
                        $this->_is_new_generation = true;
                    break;
                case 'iPhone':
                case 'iPod':
                    $this->_is_new_generation = true;
                    break;
            }
        }
    }

    /**
     * Check if is HTML5
     */
    protected function checkHTML5()
    {
        if (in_array($this->_browser_name, ['Opera', 'Internet Explorer', 'Firefox', 'Iceweasel', 'Safari', 'Chrome', 'iPhone', 'iPod'])) {
            switch ($this->_browser_name) {
                case 'Opera':
                    if ($this->_version >= 10)
                        $this->_is_html5 = true;
                    break;
                case 'Internet Explorer':
                    if ($this->_version >= 9)
                        $this->_is_html5 = true;
                    if ($this->_chrome_frame === true && $this->_chrome_frame_version >= 6)
                        $this->_is_html5 = true;
                    break;
                case 'Firefox':
                case 'Iceweasel':
                    if ($this->_version >= 4)
                        $this->_is_html5 = true;
                    break;
                case 'Safari':
                    if ($this->_version >= 5)
                        $this->_is_html5 = true;
                    break;
                case 'Chrome':
                    if ($this->_version >= 9)
                        $this->_is_html5 = true;
                    break;
                case 'iPhone':
                case 'iPod':
                    $this->_is_html5 = true;
                    break;
            }
        }
    }

    /**
     * Check the version of browser
     */
    protected function checkAge()
    {
        $this->_is_old = false;

        switch ($this->_browser_name) {
            case 'Opera':
                if ($this->_version < 10)
                    $this->_is_old = true;
                break;
            case 'Firefox':
            case 'Iceweasel':
                if ($this->_version < 3)
                    $this->_is_old = true;
                break;
            case 'Safari':
                if ($this->_version < 5)
                    $this->_is_old = true;
                break;
            case 'Chrome':
                if (version_compare($this->_version, 5, '<'))
                    $this->_is_old = true;
                break;
            case 'iPhone':
            case 'iPod':
                $this->_is_old = true;
                break;
        }
    }

    /**
     * GET the IP address
     */
    protected function checkIP()
    {
        if (getenv("HTTP_CLIENT_IP"))
            $this->_ip = getenv("HTTP_CLIENT_IP");
        elseif (getenv("HTTP_X_FORWARDED_FOR"))
            $this->_ip = getenv("HTTP_X_FORWARDED_FOR");
        else
            $this->_ip = getenv("REMOTE_ADDR");
    }
}
