public function photoExistsInEvent($eventId, $photoFileName)
    {
        if (is_null($eventId) || $eventId == '') {
            throw new Exception('The eventId is required to check if a photo exists.');
        }

        if (is_null($photoFileName) || $photoFileName == '') {
            throw new Exception('The photoFileName is required to check if a photo exists.');
        }

        $params = array(
            'method' => 'sp.event.photo_exists',
            'event_id' => $eventId,
            'photo_name' => $photoFileName
        );

        return $this->_makeApiRequest($params);
    }