one 2 rule dem all

<?php
/**
 * @author _Tobias
 * @package difm-player
 * @license DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE / http://www.wtfpl.net/txt/copying/
 */


/**
 * Variables
 */

// Expiration time of the new cookie in days.
$expiration = 30;

// Name of the cookie we need to read from.
$cookieName = 'DI.fm player';


/**
 * Main execution
 */

// Disable some unnecessary headers.
header('Content-Type: ');
header_remove('X-Powered-By');

// Check whether the replacement listen key is given in POST.
if(@empty($_POST['key'])) {
    // If this is not the case, show an error message.
    header('HTTP/1.1 400 Bad Request');
    die('Missing parameter "key"');
}

// The new cookie array will go in here.
$cookie = null;

// PHP puts the cookies in its $_COOKIE array by a key with some characters replaced, this is the right element.
$clientCookie = @$_COOKIE[preg_replace('/[^a-zA-Z0-9]/', '_', $cookieName)];

// Check whether the cookie is valid. Otherwise, use a new empty array.
if($clientCookie) {
    $cookie = @json_decode($clientCookie, true);
    if(!$cookie)
        $cookie = array();
}
else
    $cookie = array();

// Fill the 'premium' element of the array with the key given in POST.
$cookie['premium'] = $_POST['key'];

// Send the new cookie to the client in the headers.
setcookie(rawurlencode($cookieName), json_encode($cookie), time() + 86400 * $expiration, '/');

// Redirect the user to the player.
header('Location: /play/');

// Make sure there isn't any content sent conflicting with the redirect.
exit;