getting information about browser from php

get browser 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';
		$ub = "Firefox";
	}
	elseif(preg_match('/OPR/i',$u_agent))
	{
		$bname = 'Opera';
		$ub = "Opera";
	}
	elseif(preg_match('/Chrome/i',$u_agent))
	{
		$bname = 'Google Chrome';
		$ub = "Chrome";
	}
	elseif(preg_match('/Safari/i',$u_agent))
	{
		$bname = 'Apple Safari';
		$ub = "Safari";
	}
	elseif(preg_match('/Netscape/i',$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
	);
}