How to achieve real-time communication using PHP and AJAX

With the continuous development of Internet technology, real-time communication has become an indispensable part of the Internet world. Whether it is instant chat, online games, or video live broadcast and other application scenarios, real-time communication functions need to be implemented. There are more and more technical means to achieve real-time communication, among which the combination of PHP and AJAX is a good choice. This article will introduce the basic principles and steps of how to use PHP and AJAX to achieve real-time communication.

1. What is real-time communication

Real-time communication refers to instant communication between point-to-point or multiple people without significant delay through network transmission technology. Compared with traditional communication methods, real-time communication is faster and more timely, and avoids the gap between information and time. For example, when users are chatting live on a web page, whenever a new message arrives, other users will see it immediately without the need to manually refresh the page or resend the request.

2. What is PHP and AJAX

PHP is a scripting language widely used in server-side web development. It can handle dynamic content, interact with databases and other related operations, and generate HTML Web pages are accessible to users. AJAX (Asynchronous JavaScript and XML) is a network communication technology based on JavaScript and XML technology. It can communicate asynchronously with the server without refreshing the page, thereby updating dynamic content.

3. How to use PHP and AJAX to achieve real-time communication

1. Establish the server

First, you need to create a PHP script on the server side to handle the client and server communication requests between. Create a PHP file named "server.php" on the server side to receive and process client requests. The code is as follows:

$message = $_GET['message' ]; //Get the message sent by the client
while(true){ //Loop waiting for the arrival of the message

Pass the above The code implements real-time communication between the client and the server. Every time a user sends a message, other online users can receive the message immediately without refreshing the page.

4. Summary

This article introduces the principles and steps of how to use PHP and AJAX technology to achieve real-time communication. In practical applications, more functions and extensions can be added according to specific scenario requirements, such as adding user identity authentication, message push and other functions to improve the efficiency and stability of the real-time communication system.

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