mitrobill/system/controllers/logout.php

<?php
/**
* PHP Mikrotik Billing (https://ibnux.github.io/phpmixbill/)


* @copyright	Copyright (C) 2014-2015 PHP Mikrotik Billing
* @license		GNU General Public License version 2 or later; see LICENSE.txt

**/
if (session_status() == PHP_SESSION_NONE) session_start();
session_destroy();
header('location: index.php');