your code does not look quite right. use this code instead.
it should go on the success page after the closing </html> tag
<?php
// Initialize the session.
// If you are using session_name("something"), don't forget it now!
@session_start();
//store the UserID Session Variable
if(isset($_SESSION['UserID']) && $_SESSION['UserID'] != "") {
$UserID = $_SESSION['UserID'];
}
if(isset($_SESSION['UserGroupID']) && $_SESSION['UserGroupID'] != "") {
$UserGroupID = $_SESSION['UserGroupID'];
}
// Unset all of the session variables.
$_SESSION = array();
// If it's desired to kill the session, also delete the session cookie.
// Note: This will destroy the session, and not just the session data!
if (ini_get("session.use_cookies")) {
$params = session_get_cookie_params();
@setcookie(session_name(), '', time() - 42000,
$params["path"], $params["domain"],
$params["secure"], $params["httponly"]
);
}
// Finally, destroy the session.
session_destroy();
@session_start();
@session_regenerate_id(TRUE);
@session_start();
//Reset the UserID Session Variable
if(isset($UserID) && $UserID != "") {
$_SESSION['UserID'] = $UserID;
}
if(isset($UserGroupID) && $UserGroupID != "") {
$_SESSION['UserGroupID'] = $UserGroupID;
}
session_commit();
?>