core/Session.php
public static function destroy () {
        if(self::$started) {
            self::$started = false;
            unset($_COOKIE[self::$cookieName]);
            setcookie(self::$cookieName, '', 1, '/');
            session_destroy();
        } else {
            trigger_error('Session is not started!', E_USER_WARNING);
        }
    }
public static function destroy () {
        if(self::$started) {
            self::$started = false;
            unset($_COOKIE[self::$cookieName]);
            setcookie(self::$cookieName, '', 1, '/');
            session_destroy();
        } else {
            trigger_error('Session is not started!', E_USER_WARNING);
        }
    }
Destroy session