Bluz\Cache\Adapter\Predis::doSet PHP Method

    protected function doSet($id, $data, $ttl = Cache::TTL_NO_EXPIRY)
    {
        $data = serialize($data);
        if (Cache::TTL_NO_EXPIRY == $ttl) {
            return $this->getHandler()->set($id, $data);
        } else {
            return $this->getHandler()->setex($id, $ttl, $data);
        }
    }