From basics to practice, teach you step by step how to learn Swoole

With the continuous development and progress of the Internet era, the performance of web applications has become one of the keys to enterprise development. However, traditional PHP is often prone to crashing under high concurrency and large traffic conditions, affecting application performance and user experience. To solve this problem, Swoole came into being.

Swoole is a high-performance PHP coroutine framework that can achieve high concurrency and asynchronous programming, greatly improving the performance and efficiency of web applications. This article will teach you step by step how to learn Swoole from basics to practice.

1. Basic knowledge of Swoole

1. Coroutine concept

Coroutine is a lightweight thread in user mode, which is different from the operating system the rout. It only needs to switch contexts without making system calls. The switching speed is faster and the memory usage is smaller. Coroutines can greatly improve the concurrency performance of programs.

2. Features of Swoole

• High concurrency and high performance.
• Support asynchronous IO operations.
• Provides complete network communication protocols, such as HTTP, WebSocket, TCP, UDP, etc.
• Supports coroutines and can implement asynchronous programming.
• Provides multi-process and multi-thread models, which can make full use of multi-core CPUs.

2. Swoole installation

1. Environment requirements

• PHP version is greater than 7.0.
• Linux, Unix or MacOS operating system.

2. Installation command

Execute the following command in the command line to install the Swoole extension:

pecl install swoole

After the installation is completed, in php. Add the following content to the ini file:

extension=swoole.so

Save and restart PHP-FPM.

3. Use of Swoole

1. Simple case

The following is a simple Swoole case that can output Hello, Swoole!:

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

$http->on("start", function ($server) {
    echo "Swoole http server is started at http://127.0.0.1:9501
";
});

$http->on("request", function ($request, $response) {
    $response->header("Content-Type", "text/plain");
    $response->end("Hello, Swoole!");
});

$http->start();

Execute the php file name command on the command line, open the browser and visit http://localhost:9501, and you can see the output of Hello, Swoole!.

2. WebSocket Case

The following is a simple Swoole WebSocket case that can implement a simple chat room function:

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

$serv->on('open', function ($server, $req) {
    echo "connection open: {$req->fd}
";
});

$serv->on('message', function ($server, $frame) {
    echo "received message: {$frame->data}
";
    $server->push($frame->fd, json_encode(["hello", "world"]));
});

$serv->on('close', function ($server, $fd) {
    echo "connection close: {$fd}
";
});

$serv->start();

Execute php in the command line File name command, open the browser console, and execute the following JS code:

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

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

ws.onmessage = function (evt) 
{ 
    console.log('received message: ' + evt.data);
};

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

ws.send('Hello Swoole WebSocket');

After running, you can see that the console outputs WebSocket is connected and received message: ["hello", "world"].

4. Summary

Through the introduction of this article, I believe that everyone has mastered the basic knowledge and usage of the Swoole coroutine framework. In actual development, we can make full use of Swoole's high concurrency, high performance, and asynchronous programming features to improve the performance and efficiency of web applications.

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