chamilo-lms2/main/auth/cas/logout.php

<?php
/* For licensing terms, see /license.txt */
/*
Call this file to disconnect from CAS session.
logoutWithUrl() not used because with CAS v3 you cannot redirect your logout to a specific URL
because of security reason.
*/
require '../..//inc/global.inc.php';
require_once('authcas.php');
global $cas_auth_ver, $cas_auth_server, $cas_auth_port, $cas_auth_uri;

phpCAS::client($cas_auth_ver, $cas_auth_server, $cas_auth_port, $cas_auth_uri);
phpCAS::logout();