How to use PHP7.0 for real-time message push?

With the popularity of web applications, real-time message push has become an indispensable function for many websites, such as online chat, real-time notifications, etc. In this article, we will introduce how to use PHP7.0 for real-time message push.

1. What is real-time message push?

Real-time message push means that the web application can push the latest messages to the client in real time without the client constantly requesting the server to obtain the latest data. This is achieved through the working principle of WebSocket. WebSocket is a full-duplex communication protocol based on the TCP protocol, which can establish a sustainable connection between the client and the server to achieve real-time message push.

2. Preparation for using PHP for real-time message push

To use PHP for real-time message push, we need to do some preparations first:

1. Install PHP extension

First, we need to install the swoole extension of PHP. Swoole is an asynchronous and concurrent PHP network communication engine that can easily implement WebSocket communication. We can use the following command to install:

pecl install swoole

2. Create a WebSocket server

Next, we need to create a WebSocket server to listen to client requests. Here we use the WebSocket class provided by the swoole extension to implement it. The code is as follows:

<?php

// 创建WebSocket服务器
$server = new swoole_websocket_server("0.0.0.0", 9501);

// 监听WebSocket连接打开事件
$server->on('open', function (swoole_websocket_server $server, $request) {
    echo "Opened WebSocket connection from {$request->fd}
";
});

// 监听WebSocket消息事件
$server->on('message', function (swoole_websocket_server $server, $frame) {
    echo "Received message: {$frame->data}
";

    // 向客户端发送消息
    $server->push($frame->fd, "Hello, {$frame->data}!");
});

// 监听WebSocket连接关闭事件
$server->on('close', function (swoole_websocket_server $server, $fd) {
    echo "Closed WebSocket connection from {$fd}
";
});

// 启动WebSocket服务器
$server->start();

In the above code, we created a WebSocket server and listened to three events: open connection, message and closed connection. When a client connects, we will send a "welcome" message. When the client sends a message, we send the message directly to the client.

3. Communication between the client and the WebSocket server

1. Test the WebSocket server

In order to test the WebSocket server, we can use the "Simple WebSocket Client" plug-in of the Chrome browser. Open the plug-in interface, enter the address and port of the WebSocket server (for example: ws://127.0.0.1:9501/), and click the "Connect" button to connect to the WebSocket server.

2. Send a message

After the connection is successful, we can enter a message in the input box and click the "Send" button to send the message. The WebSocket server will send the message to the client and print the received message in the console.

3. Conclusion

This article introduces how to use PHP7.0 for real-time message push, create a WebSocket server through the WebSocket class provided by the swoole extension, and then link to the WebSocket server through the client to achieve Real-time communication capabilities. When developing the real-time message push function, issues such as real-time performance, reliability, and security need to be taken into consideration. Sufficient demand research and technical preparations need to be done before development to ensure that the final application system has high availability. and stability.

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