public function reportPhoto($photo_id, $reason)
    {

        if (!is_numeric($photo_id) || 0 >= $photo_id) {
            throw new InvalidArgumentException(
                "Api::reportPhoto photo_id field should be positive integer");
        }

        if (trim($reason) == '') {
            throw new InvalidArgumentException(
                "Api::reportPhoto reason field should not be empty");
        }

        /** @var $command \Guzzle\Service\Command\AbstractCommand */
        $command = $this->client->getCommand('ReportPhoto',array('photo_id' => $photo_id, 'report' => array('reason' => $reason)));

        return $this->executeCommand($command);
    }