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<?php
    /**
     * Browser detection class
     *
     * @author      Original Author: Chris Schuld (http://chrisschuld.com/)
     * @author      Modifications for EDD: Chris Christoff
     * @version     1.9
     *              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/
     *              Based on original work from Gary White (http://apptools.com/phptools/browser/
     *              CHANGELOG:
     *              2012-12-26 (v1.9c by Chris Christoff):
     *              + Changed vars to publics
     *              2012-12-23 (v1.9b by Chris Christoff):
     *              + Removed the browser string return and added spacing.
     *              + Also removed return HTML formatting.
     *              2012-12-23 (v1.9a by Chris Christoff):
     *              + Split user string and add formatting so we can print a nicely
     *              formatted user agent string
     *              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)
     */


    // Exit if accessed directly
    if ( ! defined( 'ABSPATH' ) ) {
        exit;
    }

    if ( ! class_exists( 'Browser' ) ) {

        /**
         * Browser detection class
         *
         * @author      Chris Schuld
         * @since       1.0
         */
        class Browser {
            public $_agent = '';
            public $_browser_name = '';
            public $_version = '';
            public $_platform = '';
            public $_os = '';
            public $_is_aol = false;
            public $_is_mobile = false;
            public $_is_robot = false;
            public $_aol_version = '';

            public $BROWSER_UNKNOWN = 'unknown';
            public $VERSION_UNKNOWN = 'unknown';

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

            public $BROWSER_NETSCAPE_NAVIGATOR = 'Netscape Navigator'; // Http://browser.netscape.com/ (DEPRECATED)
            public $BROWSER_GALEON = 'Galeon'; // Http://galeon.sourceforge.net/ (DEPRECATED)
            public $BROWSER_NETPOSITIVE = 'NetPositive'; // Http://en.wikipedia.org/wiki/NetPositive (DEPRECATED)
            public $BROWSER_PHOENIX = 'Phoenix'; // Http://en.wikipedia.org/wiki/History_of_Mozilla_Firefox (DEPRECATED)

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

            public $OPERATING_SYSTEM_UNKNOWN = 'unknown';

            function Browser( $useragent = '' ) {
                $this->reset();

                if ( $useragent != '' ) {
                    $this->setUserAgent( $useragent );
                } else {
                    $this->determine();
                }
            }

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

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

            /**
             * The name of the browser.  All return types are from the class contants
             *
             * @return string Name of the browser
             */
            function getBrowser() {
                return $this->_browser_name;
            }

            /**
             * Set the name of the browser
             *
             * @param $browser The name of the Browser
             */
            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
             */
            function getPlatform() {
                return $this->_platform;
            }

            /**
             * Set the name of the platform
             *
             * @param $platform The name of the Platform
             */
            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)
             */
            function getVersion() {
                return $this->_version;
            }

            /**
             * Set the version of the browser
             *
             * @param $version The version of the Browser
             */
            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)
             */
            function getAolVersion() {
                return $this->_aol_version;
            }

            /**
             * Set the version of AOL
             *
             * @param $version The version of AOL
             */
            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
             */
            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
             */
            function isMobile() {
                return $this->_is_mobile;
            }

            /**
             * Is the browser from a robot (ex Slurp,GoogleBot)?
             *
             * @return boolean True if the browser is from a robot otherwise false
             */
            function isRobot() {
                return $this->_is_robot;
            }

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

            /**
             * Set the Browser to be mobile
             *
             * @param boolean $value is the browser a mobile brower or not
             */
            function setMobile( $value = true ) {
                $this->_is_mobile = $value;
            }

            /**
             * Set the Browser to be a robot
             *
             * @param boolean $value is the browser a robot or not
             */
            function setRobot( $value = true ) {
                $this->_is_robot = $value;
            }

            /**
             * Get the user agent value in use to determine the browser
             *
             * @return string The user agent from the HTTP header
             */
            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
             */
            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
             */
            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
             */
            function __toString() {
                $text1    = $this->getUserAgent(); // Grabs the UA string
                $UAline1  = substr( $text1, 0, 32 ); // The first line we print should only be the first 32 characters of the UA string
                $text2    = $this->getUserAgent(); // Now we grab it again and save it to a string
                $towrapUA = str_replace( $UAline1, '', $text2 ); // The rest of the printoff (other than first line) is equivalent
                // to the whole string minus the part we printed off. IE
                // User Agent:      thefirst32charactersfromUAline1
                //                  the rest of it is now stored in
                //                  $text2 to be printed off
                // But we need to add spaces before each line that is split other than line 1
                $space = '';
                for ( $i = 0; $i < 25; $i ++ ) {
                    $space .= ' ';
                }

                // Now we split the remaining string of UA ($text2) into lines that are prefixed by spaces for formatting
                $wordwrapped = chunk_split( $towrapUA, 32, "\n $space" );

                return "Platform:                 {$this->getPlatform()} \n" .
                       "Browser Name:             {$this->getBrowser()}  \n" .
                       "Browser Version:          {$this->getVersion()} \n" .
                       "User Agent String:        $UAline1 \n\t\t\t  " .
                       "$wordwrapped";
            }

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

            /**
             * Protected routine to determine the browser type
             *
             * @return boolean True if the browser was detected otherwise false
             */
            function checkBrowsers() {
                return (
                    // Well-known, well-used
                    // Special Notes:
                    // (1) Opera must be checked before FireFox due to the odd
                    //     user agents used in some older versions of Opera
                    // (2) WebTV is strapped onto Internet Explorer so we must
                    //     check for WebTV before IE
                    // (3) (deprecated) Galeon is based on Firefox and needs to be
                    //     tested before Firefox is tested
                    // (4) OmniWeb is based on Safari so OmniWeb check must occur
                    //     before Safari
                    // (5) Netscape 9+ is based on Firefox so Netscape checks
                    //     before FireFox are necessary
                    $this->checkBrowserWebTv() ||
                    $this->checkBrowserInternetExplorer() ||
                    $this->checkBrowserOpera() ||
                    $this->checkBrowserGaleon() ||
                    $this->checkBrowserNetscapeNavigator9Plus() ||
                    $this->checkBrowserFirefox() ||
                    $this->checkBrowserChrome() ||
                    $this->checkBrowserOmniWeb() ||

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

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

                    // WebKit base check (post mobile and others)
                    $this->checkBrowserSafari() ||

                    // Everyone else
                    $this->checkBrowserNetPositive() ||
                    $this->checkBrowserFirebird() ||
                    $this->checkBrowserKonqueror() ||
                    $this->checkBrowserIcab() ||
                    $this->checkBrowserPhoenix() ||
                    $this->checkBrowserAmaya() ||
                    $this->checkBrowserLynx() ||

                    $this->checkBrowserShiretoko() ||
                    $this->checkBrowserIceCat() ||
                    $this->checkBrowserW3CValidator() ||
                    $this->checkBrowserMozilla() /* Mozilla is such an open standard that you must check it last */
                );
            }

            /**
             * Determine if the user is using a BlackBerry (last updated 1.7)
             *
             * @return boolean True if the browser is the BlackBerry browser otherwise false
             */
            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 = $this->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
             */
            function checkForAol() {
                $this->setAol( false );
                $this->setAolVersion( $this->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
             */
            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 = $this->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
             */
            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 = $this->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
             */
            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 = $this->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 = $this->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
             */
            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 = $this->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
             */
            function checkBrowserInternetExplorer() {

                // Test for v1 - v1.5 IE
                if ( stripos( $this->_agent, 'microsoft internet explorer' ) !== false ) {
                    $this->setBrowser( $this->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( $this->BROWSER_MSN );
                        $this->setVersion( str_replace( array( '(', ')', ';' ), '', $aresult[1] ) );

                        return true;
                    }
                    $aresult = explode( ' ', stristr( str_replace( ';', '; ', $this->_agent ), 'msie' ) );
                    $this->setBrowser( $this->BROWSER_IE );
                    $this->setVersion( str_replace( array( '(', ')', ';' ), '', $aresult[1] ) );

                    return true;
                    // Test for Pocket IE
                } else if ( stripos( $this->_agent, 'mspie' ) !== false || stripos( $this->_agent, 'pocket' ) !== false ) {
                    $aresult = explode( ' ', stristr( $this->_agent, 'mspie' ) );
                    $this->setPlatform( $this->PLATFORM_WINDOWS_CE );
                    $this->setBrowser( $this->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
             */
            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 = $this->BROWSER_OPERA_MINI;
                    $this->setMobile( true );

                    return true;
                } else if ( stripos( $this->_agent, 'opera' ) !== false ) {
                    $resultant = stristr( $this->_agent, 'opera' );
                    if ( preg_match( '/Version\/(10.*)$/', $resultant, $matches ) ) {
                        $this->setVersion( $matches[1] );
                    } else if ( preg_match( '/\//', $resultant ) ) {
                        $aresult  = explode( '/', str_replace( "(", " ", $resultant ) );
                        $aversion = explode( ' ', $aresult[1] );
                        $this->setVersion( $aversion[0] );
                    } else {
                        $aversion = explode( ' ', stristr( $resultant, 'opera' ) );
                        $this->setVersion( isset( $aversion[1] ) ? $aversion[1] : "" );
                    }
                    $this->_browser_name = $this->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
             */
            function checkBrowserChrome() {
                if ( stripos( $this->_agent, 'Chrome' ) !== false ) {
                    $aresult  = explode( '/', stristr( $this->_agent, 'Chrome' ) );
                    $aversion = explode( ' ', $aresult[1] );
                    $this->setVersion( $aversion[0] );
                    $this->setBrowser( $this->BROWSER_CHROME );

                    return true;
                }

                return false;
            }


            /**
             * Determine if the browser is WebTv or not (last updated 1.7)
             *
             * @return boolean True if the browser is WebTv otherwise false
             */
            function checkBrowserWebTv() {
                if ( stripos( $this->_agent, 'webtv' ) !== false ) {
                    $aresult  = explode( '/', stristr( $this->_agent, 'webtv' ) );
                    $aversion = explode( ' ', $aresult[1] );
                    $this->setVersion( $aversion[0] );
                    $this->setBrowser( $this->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
             */
            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( $this->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
             */
            function checkBrowserGaleon() {
                if ( stripos( $this->_agent, 'galeon' ) !== false ) {
                    $aresult  = explode( ' ', stristr( $this->_agent, 'galeon' ) );
                    $aversion = explode( '/', $aresult[0] );
                    $this->setVersion( $aversion[1] );
                    $this->setBrowser( $this->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
             */
            function checkBrowserKonqueror() {
                if ( stripos( $this->_agent, 'Konqueror' ) !== false ) {
                    $aresult  = explode( ' ', stristr( $this->_agent, 'Konqueror' ) );
                    $aversion = explode( '/', $aresult[0] );
                    $this->setVersion( $aversion[1] );
                    $this->setBrowser( $this->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
             */
            function checkBrowserIcab() {
                if ( stripos( $this->_agent, 'icab' ) !== false ) {
                    $aversion = explode( ' ', stristr( str_replace( '/', ' ', $this->_agent ), 'icab' ) );
                    $this->setVersion( $aversion[1] );
                    $this->setBrowser( $this->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
             */
            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( $this->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
             */
            function checkBrowserPhoenix() {
                if ( stripos( $this->_agent, 'Phoenix' ) !== false ) {
                    $aversion = explode( '/', stristr( $this->_agent, 'Phoenix' ) );
                    $this->setVersion( $aversion[1] );
                    $this->setBrowser( $this->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
             */
            function checkBrowserFirebird() {
                if ( stripos( $this->_agent, 'Firebird' ) !== false ) {
                    $aversion = explode( '/', stristr( $this->_agent, 'Firebird' ) );
                    $this->setVersion( $aversion[1] );
                    $this->setBrowser( $this->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
             */
            function checkBrowserNetscapeNavigator9Plus() {
                if ( stripos( $this->_agent, 'Firefox' ) !== false && preg_match( '/Navigator\/([^ ]*)/i', $this->_agent, $matches ) ) {
                    $this->setVersion( $matches[1] );
                    $this->setBrowser( $this->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( $this->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
             */
            function checkBrowserShiretoko() {
                if ( stripos( $this->_agent, 'Mozilla' ) !== false && preg_match( '/Shiretoko\/([^ ]*)/i', $this->_agent, $matches ) ) {
                    $this->setVersion( $matches[1] );
                    $this->setBrowser( $this->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
             */
            function checkBrowserIceCat() {
                if ( stripos( $this->_agent, 'Mozilla' ) !== false && preg_match( '/IceCat\/([^ ]*)/i', $this->_agent, $matches ) ) {
                    $this->setVersion( $matches[1] );
                    $this->setBrowser( $this->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
             */
            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( $this->BROWSER_NOKIA_S60 );
                    } else {
                        $this->setBrowser( $this->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
             */
            function checkBrowserFirefox() {
                if ( stripos( $this->_agent, 'safari' ) === false ) {
                    if ( preg_match( "/Firefox[\/ \(]([^ ;\)]+)/i", $this->_agent, $matches ) ) {
                        $this->setVersion( $matches[1] );
                        $this->setBrowser( $this->BROWSER_FIREFOX );

                        return true;
                    } else if ( preg_match( "/Firefox$/i", $this->_agent, $matches ) ) {
                        $this->setVersion( "" );
                        $this->setBrowser( $this->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
             */
            function checkBrowserIceweasel() {
                if ( stripos( $this->_agent, 'Iceweasel' ) !== false ) {
                    $aresult  = explode( '/', stristr( $this->_agent, 'Iceweasel' ) );
                    $aversion = explode( ' ', $aresult[1] );
                    $this->setVersion( $aversion[0] );
                    $this->setBrowser( $this->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
             */
            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( $this->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( $this->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( $this->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
             */
            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( $this->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
             */
            function checkBrowserAmaya() {
                if ( stripos( $this->_agent, 'amaya' ) !== false ) {
                    $aresult  = explode( '/', stristr( $this->_agent, 'Amaya' ) );
                    $aversion = explode( ' ', $aresult[1] );
                    $this->setVersion( $aversion[0] );
                    $this->setBrowser( $this->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
             */
            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( $this->VERSION_UNKNOWN );
                    }
                    $this->setBrowser( $this->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
             */
            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( $this->VERSION_UNKNOWN );
                    }
                    $this->setMobile( true );
                    $this->setBrowser( $this->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
             */
            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( $this->VERSION_UNKNOWN );
                    }
                    $this->setMobile( true );
                    $this->setBrowser( $this->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
             */
            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( $this->VERSION_UNKNOWN );
                    }
                    $this->setMobile( true );
                    $this->setBrowser( $this->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
             */
            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( $this->VERSION_UNKNOWN );
                    }
                    $this->setMobile( true );
                    $this->setBrowser( $this->BROWSER_ANDROID );

                    return true;
                }

                return false;
            }

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