PHP Decode

<?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 = $ua['name'] . " " . $ua['version'] . " on " .$ua['platform'] ; 
 ?>