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:

cf3dd256da709248aa89f3881242cf1f

2. Client page

Next, you need to use AJAX technology on the client page to send a request to the server and obtain the latest message content in real time. Add the following code on the HTML page:

8b05045a5be5764f313ed5b9168a17e6
100db36a723c770d327fc0aef2ce13b1
93f0f5c25f18dab9d176bd4f6de5d30e

   <meta charset="utf-8">
   <title>AJAX实时通信</title>
   <script src="jquery.min.js"></script>  //引入jQuery库文件

9c3bca370b5104690d9ef395f2c5f8d1
< ;body>

   <div id="message"></div>  //用来显示消息内容
   <input type="text" id="txtMsg"/> //用来输入发送的消息
   <button onclick="sendMessage()">发送消息</button>  //点击按钮发送消息

36cc49f0c466276486e50c850b7e4956
3f1c4e4b6b16bbbd69b2ee476dc4f83a

   function sendMessage() { 
       var msg = $('#txtMsg').val(); //获取输入的消息内容
       $.get("server.php", {"message":msg}); //通过get方式请求服务器，将消息发送
       checkMessage(); //调用检查消息函数
   } 
   function checkMessage() { 
       $.get("server.php", function(data){  //通过get方式请求服务器，获取最新消息
           $('#message').html(data); //将消息内容显示在页面中
           checkMessage(); //继续调用检查消息函数
       }); 
   } 
   $(function(){ 
       checkMessage(); //页面加载时开始检查消息
   });

2cacc6d41bbb37262a98f745aa00fbf0
73a6ac4ed44ffec12cee46588e518a5e

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.

The above is the detailed content of How to achieve real-time communication using PHP and AJAX. For more information, please follow other related articles on the PHP Chinese website!