PHP Decode

<?php 
/** 
 * Affiliate Cookie Tracking + Redirection Handler 
 * 
 * @package    WHMCS 
 * @author     WHMCS Limited <[email protected]> 
 * @copyright  Copyright (c) WHMCS Limited 2005-2013 
 * @license    http://www.whmcs.com/license/ WHMCS Eula 
 * @version    $Id$ 
 * @link       http://www.whmcs.com/ 
 */ 
 
use WHMCS\Cookie; 
 
define("CLIENTAREA",true); 
 
require("init.php"); 
 
// if affiliate id is present, update visitor count & set cookie 
if ($aff = $whmcs->get_req_var('aff')) { 
    update_query("tblaffiliates",array("visitors"=>"+1"),array("id"=>$aff)); 
    Cookie::set('AffiliateID',$aff,'3m'); 
} 
 
// if product id passed in, redirect to order form 
if ($pid = $whmcs->get_req_var('pid')) redir("a=add&pid=".(int)$pid,"cart.php"); 
 
// if product group id passed in, redirect to product group 
if ($gid = $whmcs->get_req_var('gid')) redir("gid=".(int)$gid,"cart.php"); 
 
// if register = true, redirect to registration form 
if ($whmcs->get_req_var('register')) redir("","register.php"); 
 
// if gocart = true, redirect to cart with request params 
if ($whmcs->get_req_var('gocart')) { 
    $reqvars = ''; 
    foreach ($_GET AS $k=>$v) $reqvars .= $k.'='.urlencode($v).'&'; 
    redir($reqvars,"cart.php"); 
} 
 
// perform redirect 
header("HTTP/1.1 301 Moved Permanently"); 
header("Location: ".$whmcs->get_config('Domain'),true,301); 
 ?>