chamilo-lms2/main/auth/shibboleth/app/view/admin_login.php

<?php

namespace Shibboleth;

/**
 * Administratrive login. Useful when the standard login is not available anymore
 * which is usually the case.
 *
 * This page allow administrators to log into the application using the standard
 * Chamilo method when Shibboleth is not available.
 *
 * @license see /license.txt
 * @author Laurent Opprecht <laurent@opprecht.info>, Nicolas Rod for the University of Geneva
 */
$dir = __DIR__;
include_once "$dir/../../init.php";

ShibbolethController::instance()->admin_login();