PHP Websocket development guide to create an efficient communication system

With the increasing development of the Internet market, more and more websites and applications need to implement instant messaging or real-time data interaction functions. The traditional http protocol cannot meet this demand, so Websocket technology was born. Websocket is a protocol of HTML5 that establishes a persistent connection between the client and the server to achieve real-time interaction, real-time push of messages and data. As a popular implementation, PHP Websocket can quickly and securely build efficient communication systems in a short development time.

1. The principle of Websocket

The HTTP protocol is a protocol based on the request-response model, that is, the client initiates a service request to the server through a request, and the server returns a response. The request-response cycle is one-way. An HTTP request will only get one response. After a request-response operation, the connection will be disconnected and the server will no longer actively send messages. The Websocket protocol is a two-way communication protocol based on the TCP protocol. It establishes a persistent connection between the client and the server and can send messages to each other at any time. The transmission of messages is two-way, not based on request-response. , the server can push messages to the client at any time, and the client can also send messages to the server.

2. Implementation of PHP Websocket

PHP Websocket is implemented on the server side. The implementation process can be mainly divided into the following steps:

1. Create a WebSocket server Object

Create a WebSocket server object, set relevant parameters, such as listening IP address and port number, and configure callback functions for related events.

2. Accept the connection request

Monitor the client’s connection request, receive the connection request and send a connection success message to the client.

3. Receive data

When the client sends data to the server, the server will receive the data to the server through the receive function.

4. Processing data

After receiving the message sent by the client, the Websocket server will generally verify and parse the message format. For different message types, the server needs special processing.

5. Send data

When the server needs to send a message to the client, it can send data to the client through the send message function. The type of data sent by the server needs to match the type of data received by the client, otherwise the client will not be able to correctly parse the message.

3. PHP Websocket Development Example

The following uses a simple PHP Websocket server to demonstrate the implementation of Websocket in PHP:

<?php
    //创建WebSocket服务器对象
    $ws_server = new swoole_websocket_server("0.0.0.0", 9501);

    //配置相关事件的回调函数
    $ws_server->on('open', function ($ws, $request) {
        echo "connection open: " . $request->fd . "
";
        $ws->push($request->fd, "welcome to the websocket server!");
    });

    $ws_server->on('message', function ($ws, $frame) {
        echo "received message: " . $frame->data . "
";
        //处理数据
        $message = "hello, " . $frame->data . " !";
        //发送数据
        $ws->push($frame->fd, $message);
    });

    $ws_server->on('close', function ($ws, $fd) {
        echo "connection close: " . $fd . "
";
    });

    //启动WebSocket服务器
    $ws_server->start();
?>

The above code implements a simple Websocket Server, after the client successfully connects to the server, the Websocket server will send a welcome message to the client. When the client sends a message to the server, the server will process the message and send the processed result back to the client. In subsequent development, protocols, data formats, etc. can be adjusted according to actual needs.

4. Summary

As one of the front-end technologies at this stage, the Websocket protocol has played a huge role in many scenarios. Compared with other Websocket implementation methods, PHP Websocket has the advantages of high development efficiency and high language popularity, and can build an efficient communication system in a short time. I hope that the content introduced in this article will be helpful to PHP Websocket developers, so that they can better use Websocket technology in actual work and study, and create a more secure, reliable, and efficient application system.

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