public function getGuestUsers($url)
    {
        $guests = Activity::find()
                    ->where(['and',
                        ['user_id' => null],
                        ['like', 'url', $url . '%', false],
                        ['>=', 'updated_at', time() - 5 * 60]
                    ])
                    ->count('id');
        if ($this->_guest) {
            $guests += 1;
        }

        return $guests;
    }