Example PHP script

vary.php

<?php
header('Vary: Accept-Language');
$lang = substr($_SERVER['HTTP_ACCEPT_LANGUAGE'], 0, 2);
switch ($lang) {
   case "en":
       header('Content-Language: en-US');
       echo "Hello World!";
       break;
   case "nl":
       header('Content-Language: nl-NL');
       echo "Hallo Wereld!";
       break;
   default:
       echo "?????????????";
}
?>