To get, set and delete data from Redis in Symfony, you can use the predis/predis package, which provides a PHP client library for Redis. Here's a step-by-step guide

To implement a Redis pool across different CentOS servers, you can use a combination of Redis Sentinel for high availability and Redis Cluster for sharding and data

Before you proceed, make sure you have Redis installed and running on your server. You'll also need to install the PHP Redis extension. If you haven't installed it yet, you can do so using the following command:

Zend OP Cache is key in having a very high performance Software Application running in PHP.

A good way to see how it is working, which files are cached and more, is using this very nice PHP