I saw that there is a setting 'dyn_params' to bypass the cache, but it does not seem to be working properly. I am using 'get' to establish the users nick and other params (I know is not very secure, but I will work on that later on

This is what I have:
require_once dirname(__FILE__)."/src/phpfreechat.class.php";
$params["serverid"] = md5(__FILE__); // calculate a unique id for this chat
$params["title"] = $_GET['title'];
$params["nick"] = $_GET['user'];
$params["channels"] = array($_GET['channel']);
$params["connect_at_startup"] = true;
$params["height"] = "200px";
$params["dyn_params"] = array("server_script_url", "nick");
$chat = new phpFreeChat($params);
This is what it tells me that it is using:
Array ( [serverid] => 8ae4bfda1af9a4c53156ba94f7c736ac [title] => General Chat [nick] => felipe [channels] => Array ( [0] => General Chats ) [connect_at_startup] => 1 [height] => 200px [dyn_params] => Array ( [0] => server_script_url [1] => nick ) )
Is there something I am missing here?
I have seen other posts in this board and the recommendation is to use this param, but I have not seen any report of whether or not it has worked for them.
Thanks for any help that you can give me.
Regards,
Felipe