SWDB/application/action/logout.php

<?php
/**
 * File for the logout action.
 *
 * Implements an action function to be called from the {@see Controller}.
 *
 * @author Iñigo Valentin <i@inigovalentin.com>
 * @license https://www.gnu.org/licenses/gpl-3.0.en.html GNU General Public License V3
 * @package SWDB
 */

/**
 * Logs the user out and redirects to the login page.
 *
 * Invalidates cookies and session variables.
 * 
 * @category Action
 */
function action(){
    setcookie("user_id", null, time() - 3600);
    setcookie("user_token", null, time() - 3600);
    session_regenerate_id();
    $_SESSION['session'] = false;
    $_SESSION['user_id'] = "";
    header("Location: /");
}