PHP device sniffer. Do stuff on the server side.

device_sniffer.php

<?php

//Detect special conditions devices
$iPod    = stripos($_SERVER['HTTP_USER_AGENT'],"iPod");
$iPhone  = stripos($_SERVER['HTTP_USER_AGENT'],"iPhone");
$iPad    = stripos($_SERVER['HTTP_USER_AGENT'],"iPad");
$Android = stripos($_SERVER['HTTP_USER_AGENT'],"Android");
$webOS   = stripos($_SERVER['HTTP_USER_AGENT'],"webOS");

//do something with this information
if( $iPod || $iPhone ){
    //browser reported as an iPhone/iPod touch -- do something here
}else if($iPad){
    //browser reported as an iPad -- do something here
}else if($Android){
    //browser reported as an Android device -- do something here
}else if($webOS){
    //browser reported as a webOS device -- do something here
}
?>