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  • Identifying Browser & Platform

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    PHP has given some useful environment variable that are there in the phpinfo.php page that was used to setup the PHP environment.The best environment variables set by PHP is HTTP_USER_AGENT which identifies the user's browser and operating system.

    PHP has a function getenv() to access the value of all the environment variables. The information contained in the HTTP_USER_AGENT environment variable is used to create dynamic content matchable to the browser.

    ex

    <html>
       <body>
       
          <?php
             function getBrowser() { 
                $u_agent = $_SERVER['HTTP_USER_AGENT']; 
                $bname = 'Unknown';
                $platform = 'Unknown';
                $version = "";
                
                //First get the platform?
                if (preg_match('/linux/i', $u_agent)) {
                   $platform = 'linux';
                }elseif (preg_match('/macintosh|mac os x/i', $u_agent)) {
                   $platform = 'mac';
                }elseif (preg_match('/windows|win32/i', $u_agent)) {
                   $platform = 'windows';
                }
                
                // Next get the name of the useragent yes seperately and for good reason
                if(preg_match('/MSIE/i',$u_agent) && !preg_match('/Opera/i',$u_agent)) {
                   $bname = 'Internet Explorer';
                   $ub = "MSIE";
                } elseif(preg_match('/Firefox/i',$u_agent)) {
                   $bname = 'Mozilla Firefox';
                   $ub = "Firefox";
                } elseif(preg_match('/Chrome/i',$u_agent)) {
                   $bname = 'Google Chrome';
                   $ub = "Chrome";
                }elseif(preg_match('/Safari/i',$u_agent)) {
                   $bname = 'Apple Safari';
                   $ub = "Safari";
                }elseif(preg_match('/Opera/i',$u_agent)) {
                   $bname = 'Opera';
                   $ub = "Opera";
                }elseif(preg_match('/Netscape/i',$u_agent)) {
                   $bname = 'Netscape';
                   $ub = "Netscape";
                }
                
                // finally get the correct version number
                $known = array('Version', $ub, 'other');
                $pattern = '#(?<browser>' . join('|', $known) . ')[/ ]+(?<version>[0-9.|a-zA-Z.]*)#';
                
                if (!preg_match_all($pattern, $u_agent, $matches)) {
                   // we have no matching number just continue
                }
                
                // see how many we have
                $i = count($matches['browser']);
                
                if ($i != 1) {
                   //we will have two since we are not using 'other' argument yet
                   
                   //see if version is before or after the name
                   if (strripos($u_agent,"Version") < strripos($u_agent,$ub)){
                      $version= $matches['version'][0];
                   }else {
                      $version= $matches['version'][1];
                   }
                }else {
                   $version= $matches['version'][0];
                }
                
                // check if we have a number
                if ($version == null || $version == "") {$version = "?";}
                return array(
                   'userAgent' => $u_agent,
                   'name'      => $bname,
                   'version'   => $version,
                   'platform'  => $platform,
                   'pattern'   => $pattern
                );
             }
             
             // now try it
             $ua = getBrowser();
             $yourbrowser = "Your browser: " . $ua['name'] . " " . $ua['version'] .
                " on " .$ua['platform'] . " reports: <br >" . $ua['userAgent'];
             
             print_r($yourbrowser);
          ?>
       
       </body>
    </html>

    The result is this

    Your browser: Mozilla Firefox 43.0 on linux reports:
    Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:43.0) Gecko/20100101 Firefox/43.0

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