public function getPlaceholderCount($slideNumber, $storageName = '', $folder = '')
    {


        $strURI = Product::$baseProductUri . '/slides/' . $this->getFileName() . '/slides/' . $slideNumber . '/placeholders';
        if ($folder != '') {
            $strURI .= '?folder=' . $folder;
        }
        if ($storageName != '') {
            $strURI .= '&storage=' . $storageName;
        }
        //Build URI to get placeholders
        $signedURI = Utils::sign($strURI);

        $responseStream = Utils::processCommand($signedURI, 'GET', '', '');

        $json = json_decode($responseStream);

        return count($json->Placeholders->PlaceholderLinks);
    }