Redirect page based on device type

device-redirect.php

<?php
$iPod    = stripos($_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");

if( $iPod || $iPhone || $iPad){
  header( 'Location: https://facebook.com' );
  die();
  
}
else if($Android){
  header( 'Location: https://google.com' );
  die();
}
else
{
  die();
}
?>