Ratchet\Session\Serialize\PhpHandler::serialize PHP Метод

    function serialize(array $data)
    {
        $preSerialized = array();
        $serialized = '';
        if (count($data)) {
            foreach ($data as $bucket => $bucketData) {
                $preSerialized[] = $bucket . '|' . serialize($bucketData);
            }
            $serialized = implode('', $preSerialized);
        }
        return $serialized;
    }