public function read($key)
    {
        $key = strval($key);
        $val = null;

        if(strlen($key) == 0)
        {
            return $val;
        }

        $this->openSession();

        if(isset($_SESSION[$key]) == true)
        {
            $val = $_SESSION[$key];
        }

        $this->closeSession();

        return $val;
    }