PHP for getting browser info

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<?php

// get browser data from useragent string for tracking
function _getBrowserInfo() {
	// grab the useragent
	$ua = $_SERVER['HTTP_USER_AGENT'];
	// list of browsers we want to match
	$browsers = array(
		"firefox", 
		"msie", 
		"opera", 
		"chrome", 
		"safari",
		"mozilla", 
		"seamonkey",
		"konqueror", 
		"netscape",
		"navigator", 
		"mosaic", 
		"lynx", 
		"amaya",
		"omniweb", 
		"avant", 
		"camino", 
		"flock", 
		"aol",
		"applewebkit"
	);
	// list of platforms we want to match
	$platforms = array(
		"Linux",
		"Macintosh",
		"Windows",
		"iPad",
		"iPhone",
		"Android"
	);

	// defaults
	$browser = "undetected";
	$browser_version = "undetected";
	$platform = "undetected";
	$platform_version = "undetected";

	// match out the middle details part split by ;
	preg_match("/\(([^\)]*)\)/", $ua, $matches);
	$details = $matches[0];
	echo $details;
	$details_array = explode(';', $matches[1]);

	// loop through the browsers
	foreach ($browsers as $b) {
		if (preg_match("/\)\s($b)[\/ ]?([\d.]*)/i", $ua, $matches)) {
			$browser = $matches[1];
			$browser_version = $matches[2];
			break;
		}
	}
	// loop through the platforms
	foreach ($platforms as $p) {
		if (preg_match("/($p)/i", $ua, $matches)) {
			$platform = $matches[1];
			// switch to OS X if it's available
			if ($platform == "Macintosh" && preg_match("/(Mac OS X)/i", $ua, $matches))
				$platform = $matches[1];
			// switch to Android if it's available
			if ($platform == "Android" && preg_match("/(Android)/i", $ua, $matches))
				$platform = $matches[1];
			// match the version for apple platforms
			if (($platform == "Macintosh" || $platform == "Mac OS X" || $platform == "iPad" || $platform == "iPhone") && preg_match("/([\d]+[_\d]{2,})/", $details, $matches))
				$platform_version = $matches[1];
			// match version for windows
			if ($platform == "Windows" && preg_match("/Windows NT ([\d.]*)/", $ua, $matches))
				$platform_version = $matches[1];
			if (($platform == "Linux" || $platform == "Android") && preg_match("/$platform ([\d.]*)/", $ua, $matches))
				$platform_version = $matches[1];
			break;
		}
	}

	// create our return array
	$return_array = array(
		'user_agent' => $ua,
		'browser' => $browser,
		'browser_version' => $browser_version,
		'platform' => $platform,
		'platform_version' => $platform_version
	);

	// return back
	return $return_array;
}

?>