How to use PHP's Swoole extension?

PHP’s Swoole extension is a high-performance asynchronous network communication framework. It can be used to build web server and client applications based on protocols such as TCP, UDP, Unix sockets, etc. Swoole extensions are currently widely used in game servers, chat applications, real-time data push and other fields. This article will introduce how to use the Swoole extension of PHP.

1. Install the Swoole extension

Before using the Swoole extension, you need to install the extension first. It can be installed in the following two ways.

1. Use the pecl command to install:

pecl install swoole

2. Manually compile and install:

Download the source code from the GitHub repository of the Swoole extension ：

git clone https://github.com/swoole/swoole-src.git

Extract the source code and enter the directory:

tar -zxvf swoole-src.tar.gz
cd swoole-src

Execute the following command:

phpize
./configure
make
make install

2. Use Swoole extension

1. Start the TCP server

The following is a code example to start a simple TCP server:

$server = new SwooleServer("127.0.0.1", 9501);

//监听连接进入事件
$server->on('connect', function ($server, $fd) {
    echo "Client: {$fd} Connect.
";
});

//监听数据接收事件
$server->on('receive', function ($server, $fd, $from_id, $data) {
    $server->send($fd, "Server: {$data}");
});

//监听连接关闭事件
$server->on('close', function ($server, $fd) {
    echo "Client: {$fd} Close.
";
});

//启动服务器
$server->start();

In the above code, we created a TCP server listening on port 9501 of 127.0.0.1. When the client establishes a connection, the connection entry event is triggered. When the server receives data, the data receive event is triggered and the received data is sent back to the client intact. When the client closes the connection, the connection close event is triggered.

2. Start WebSocket Server

The following is a code example to start a simple WebSocket server:

$server = new SwooleWebSocketServer("127.0.0.1", 9501);

//监听WebSocket连接打开事件
$server->on('open', function ($server, $request) {
    echo "Client: {$request->fd} Connect.
";
});

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

//监听WebSocket连接关闭事件
$server->on('close', function ($server, $fd) {
    echo "Client: {$fd} Close.
";
});

//启动服务器
$server->start();

In the above code, we create a WebSocket server, listening on port 9501 of 127.0.0.1. When a WebSocket client connects to a server, the connection open event is triggered. When the WebSocket client sends a message to the server, the message event is triggered and the received message is sent back to the client intact. When the WebSocket client closes the connection, the connection close event is triggered.

3. Send an asynchronous HTTP request

The following is a code example to send an asynchronous HTTP request:

$client = new SwooleCoroutineHttpClient('www.baidu.com', 80);
$client->set(['timeout' => 1]);
$client->setHeaders([
    'Host' => "www.baidu.com",
    "User-Agent" => 'Chrome/49.0.2587.3',
    'Accept' => 'text/html,application/xhtml+xml,application/xml',
    'Accept-Encoding' => 'gzip',
]);
$client->set(['timeout' => 1]);
$client->get('/index.php');
echo $client->body;

In the above code, we create an HTTP The client asynchronously sends a GET request to the /index.php path of www.baidu.com, obtains a response, and outputs the response content.

Summary:

This article introduces how to use the Swoole extension of PHP. Through Swoole extension, we can achieve high-performance asynchronous network communication and build various common network applications. It is worth noting that the Swoole extension requires PHP7 or above. In addition, when using the Swoole extension, you need to pay attention to its high concurrency characteristics to avoid affecting the stability of the application.

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