Getting Started with Redis in PHP

What is Redis?

Redis created by Salvatore Sanfilippo is an open source, in-memory data structure server with advanced key-value cache and store, often referred to as a NoSQL database. It is also referred to as a data structure server, since it can store strings, hashes, lists, sets, sorted sets, and more.

The essence of a key-value store is the ability to store some data, called a value inside a key. This data can later be retrieved only if we know the exact key used to store it.

Usage of Redis

• Caching can be used in the same manner as memcached.
• Leaderboards or related problems.
• Counting stuff.
• Real time analysis.
• Deletion and filtering.
• Show latest item listings in your home page.

Install on Windows

Now, let us check how to set up Redis PHP driver.

You need to download the phpredis from github repository https://github.com/nicolasff/phpredis. Once you’ve downloaded it, extract the files to phpredis directory.

extension = redis.so

Connect to Redis Server

Inter Process Communication Using PHP ,ZeroMQ AND React/ZMQ

push the external changes to existing web pages

The above diagram shows the any external php file or database layer changes has happen should be notify to all our web client. We can able to achieve this using React/ZMQ

Requirements

ZeroMQ

All Our client web pages will be listening to port 8080 for incoming WebSocket connections...but how will it also get updates from another PHP script or another server process event. Enter ZeroMQ. We could use raw sockets, like the ones Ratchet is built on, but ZeroMQ is a library that just makes sockets easier. install zmq

React/ZMQ

Ratchet is a WebSocket library built on top of a socket library called React. React handles connections and the raw I/O for Ratchet. In addition to React, which comes with Ratchet, we need another library that is part of the React suite: React/ZMQ. This library will bind ZeroMQ sockets to the Reactor core enabling us to handle both WebSockets and ZeroMQ sockets. To install, your composer.json file should look like this:

To Run the above application go to root directory "push" run below command to run the web socket connection on server side

php bin/push-server.php

Run the : "push\src\MyApp\clientwebpage.html" which connect to web socket listen to the specified category

PHP ZMQ extension Installation in Apache 2.4 & php 5.6

PHP ZMQ extension we will look at how you can easily distribute work to background processes, provide flexible service brokering for your next service oriented architecture, and manage caches efficiently and easily with just PHP and the ZeroMQ libraries. Whether the problem is asynchronous communication, message distribution, process management or just about anything, ZeroMQ can help you build an architecture that is more resilient, more scalable and more flexible, without introducing unnecessary overhead or requiring a heavyweight queue manager node..

Installing ZMQ in Windows

Required Softwares Apache 2.4 & PHP 5.6

1. Download the zmq php extension from following url depends up on the installed php version
   url: ZMq Download Url
2. Extract the folder
3. Copy the php_zmq.dll to php/ext directory
4. Then copy the libzmq.dll to the php/ root directory
5. Add below line in php.ini file : extension=php_zmq.dll