Как истекает сеанс PHP через X минут

<?php if (isset($_SESSION['LAST_ACTIVITY']) && (time() - $_SESSION['LAST_ACTIVITY'] > 1800)) { // last request was more than 30 minutes ago session_unset(); // unset $_SESSION variable for the run-time session_destroy(); // destroy session data in storage } $_SESSION['LAST_ACTIVITY'] = time(); // update last activity time stamp /* You can also use an additional time stamp to regenerate the session ID periodically to avoid attacks on sessions like session fixation: */ if (!isset($_SESSION['CREATED'])) { $_SESSION['CREATED'] = time(); } else if (time() - $_SESSION['CREATED'] > 1800) { // session started more than 30 minutes ago session_regenerate_id(true); // change session ID for the current session an invalidate old session ID $_SESSION['CREATED'] = time(); // update creation time } //note that session.gc_maxlifetime should be at least equal to the life time of this custom expiration handler (1800 in this example). ?>