Doctrine\Common\Cache\PredisCache::doSave PHP Method

    protected function doSave($id, $data, $lifeTime = 0)
    {
        $data = serialize($data);
        if ($lifeTime > 0) {
            $response = $this->client->setex($id, $lifeTime, $data);
        } else {
            $response = $this->client->set($id, $data);
        }
        return $response === true || $response == 'OK';
    }

 protected function doSave($id, $data, $lifeTime = 0)
 {
     return parent::doSave($id, serialize($data), $lifeTime);
 }