convert a tiny script

[skeeterr]

I recently switched from phpbb to Vbulletin and I am completly lost.

I have this tiny script that I am trying to convert but I'm not having any luck.

All it does is check to see if user is logged in, if they are it passes the username/gender along.

Any ideas on how I would convert this to work with vbulletin?

PHP Code:

$uid = $_GET['uid']
db::connect();


    $result = db::select("session_id='".$_GET['uid']."'","phpbb_sessions");
    $userId = $result[0]['session_user_id'];


if (isset($userId))
{
    $result = db::select("user_id = $userId", "phpbb_users");
    $row1 = $result[0];
    echo xml::node('auth', array (
            'username' => $row1['username'],
            'gender' => $row1['user_gender']-1,
        ));
} else {
    echo '<error = "1" />';
} 


Any help would be greatly appreciated!
Thanks