How to use Swoole to develop high-performance network servers

With the development of the Internet, high-performance network servers are increasingly favored by developers. As a high-performance network communication engine developed based on PHP language, Swoole can greatly improve the efficiency of network communication and has been widely used in the field of Internet applications.

So, how to use Swoole to develop a high-performance network server? Next, we will take you through specific code examples to gain an in-depth understanding of the development and application of Swoole.

1. Install Swoole

Installing Swoole is very simple, just use the PHP official extension manager PECL. The specific method is as follows:

$ pecl install swoole

After the installation is completed, edit the php.ini file, add a line of configuration in it, and enable the swoole extension.

extension=swoole.so

2. Write a simple HTTP server

Let’s write a simple HTTP server for everyone to understand the basic usage of Swoole.

<?php
$http = new swoole_http_server("127.0.0.1", 9501);

$http->on('request', function ($request, $response) {
    $response->header("Content-Type", "text/html; charset=utf-8");
    $response->end("<h1>Hello Swoole!</h1>");
});

$http->start();

We can execute the following command in the terminal to start the HTTP server:

$ php server.php

Then, visit http://127.0.0.1:9501 in the browser. That is You can see the output Hello Swoole!.

3. Real-time communication using WebSocket

Swoole also supports the use of WebSocket protocol to realize real-time communication. Below we will write a simple chat room application for everyone to understand Swoole's real-time communication function.

<?php
$ws = new swoole_websocket_server("127.0.0.1", 9502);

$ws->on('open', function ($ws, $request) {
    echo "client-{$request->fd} is connected
";
});

$ws->on('message', function ($ws, $frame) {
    echo "received message: {$frame->data}
";
    foreach($ws->connections as $fd) {
        $ws->push($fd, $frame->data);
    }
});

$ws->on('close', function ($ws, $fd) {
    echo "client-{$fd} is closed
";
});

$ws->start();

We can execute the following command in the terminal to start the WebSocket server:

$ php chatroom.php

Then, visit http://localhost:8080 in the browser and turn on JavaScript Console, execute the following code:

let ws = new WebSocket('ws://127.0.0.1:9502');

ws.onopen = function() {
    console.log('WebSocket is connected.');
};

ws.onmessage = function(event) {
    console.log(`received message: ${event.data}`);
};

ws.onclose = function() {
    console.log('WebSocket is closed.');
};

ws.send('hello world');

At this time, we can see in the JavaScript console that the message sent by the server has been received. By opening multiple tabs in the browser, we can see a simple chat room effect.

4. Use coroutines to improve concurrency capabilities

Swoole supports the use of coroutines to improve concurrency processing capabilities. Below we will write a simple coroutine application for everyone to understand the coroutine function of Swoole.

<?php
Coun(function() {
    $result1 = Co::exec('ls');
    $result2 = Co::exec('pwd');
    $result3 = Co::exec('date');
    
    echo "result1: {$result1[0]}
";
    echo "result2: {$result2[0]}
";
    echo "result3: {$result3[0]}
";
});

We can execute the following command in the terminal to run the coroutine application:

$ php coroutine.php

At this time, we can see the execution results, which correspond to the execution ls, The output of the pwd and date commands.

The above are the basic application examples of Swoole. Through these examples, we introduce the basic knowledge points of Swoole, including HTTP, WebSocket, coroutines, etc. I believe that through these examples, everyone can already master the basic usage of Swoole and develop a high-performance network server. Of course, in actual applications, richer functions and more complex application scenarios may be needed, which requires continuous learning and exploration.

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