mobile browser detection

index.php

<?php
$mobiles = array(
	'iphone','ipod','android','blackberry',//and so on
);
$agent = strtolower($_SERVER['HTTP_USER_AGENT']);

if($match = preg_match('/('.implode('|',$mobiles).')/', $agent)){
	echo 'mobile';
	//include mobile stuff here
} else {
	echo 'not mobile';
	//do normal stuffs
}

Right... erm... I meant that...