Mobile Website Development

<?php
$android = strpos($_SERVER['HTTP_USER_AGENT'],"Android");
$bberry = strpos($_SERVER['HTTP_USER_AGENT'],"BlackBerry");
$iphone = strpos($_SERVER['HTTP_USER_AGENT'],"iPhone");
$ipod = strpos($_SERVER['HTTP_USER_AGENT'],"iPod");
$webos = strpos($_SERVER['HTTP_USER_AGENT'],"webOS");
if ($android || $bberry || $iphone || $ipod || $webos== true)
{
header('Location: http://www.yoursite.com/mobile');
}
?>