protected function setSessionConfig ()
    {
        // 1 WEEK FROM NOW
        $oneWeek        = time() + 60 * 60 * 24 * 7;
        $this->expire   = $this->expire     ?? $oneWeek;
        // '/path' or dir that is using cookies
        $this->path     = $this->path       ?? "/";
        // 'www.mysite.com';
        $this->domain   = $this->domain     ?? NULL;
        // isset($_SERVER['HTTPS']);
        $this->secure   = $this->secure     ?? NULL;
        // JavaScript can't access cookie
        $this->httponly = $this->httponly   ?? TRUE;
        session_set_cookie_params($this->expire, $this->path, $this->domain, $this->secure, $this->httponly);
    }