PHP 接收長url並重新導向

如url的連結：http://localhost/redirect.php?url=http://www.google.cn/search?sourceid=navclient-ff&ie=UTF-8&rls=GGGL,GGGL:2006-43,GGGL:en&q=phpurl

程式碼如下：
//接收url
$dest=$_GET['url'];

//將斷開的url存入數組
if (isset($HTTP_GET_VARS))
    foreach (array_keys($HTTP_GET_VARS) as $key)
    {
        if ($key != 'articleid' && $key != 'url')
            $vars[] = $key.'='.$HTTP_GET_VARS[$key];
    }

//將數組拆分並組合成字串
$url = $dest.'&'.implode("&", $vars);

//重新導向
header("Location: ".$url);