function photos_upload_checkTickets($tickets)
    {
        /** http://www.flickr.com/services/api/flickr.photos.upload.checkTickets.html */
        if (is_array($tickets)) {
            $tickets = implode(",", $tickets);
        }
        $this->request("flickr.photos.upload.checkTickets", array("tickets" => $tickets), TRUE);
        return $this->parsed_response ? $this->parsed_response['uploader']['ticket'] : false;
    }