soselo/base.php

<?php

if (!isset($_COOKIE['_session']) || !file_exists('/tmp/apcontrol-sessions')) {
	header('Location: login.php'); die;
}

$session = trim($_COOKIE['_session']);
$sessions = explode("\n", trim(file_get_contents('/tmp/apcontrol-sessions')));
if (!in_array($session, $sessions)) {
	header('Location: login.php'); die;
}