How to use Swoole extension in PHP for server development

With the development of the Internet, PHP application scenarios are becoming more and more widespread. Especially under the demand for high concurrency while ensuring performance, using Swoole extensions for server development has become a popular way. This article will introduce how to use Swoole extension in PHP for server development.

1. Introduction to Swoole

Swoole is a high-performance PHP network communication framework. It is developed based on PHP extensions and provides multi-process, multi-thread, coroutine and other support similar to Java. , which greatly improves operating efficiency. In addition, Swoole also supports TCP, UDP, WebSocket and other protocols, making it very convenient to develop network applications.

2. Environment configuration

Before using Swoole for development, we first need to install the Swoole extension on the server. The following are the steps to install Swoole:

1. Execute the following commands on the server to download and decompress the Swoole installation package

wget https://github.com/swoole/swoole-src/archive/ v4.3.5.tar.gz
tar zxvf v4.3.5.tar.gz

2. Enter the decompressed folder and execute the following command to compile and install

cd swoole-src -4.3.5
phpize
./configure --enable-sockets --enable-mysqlnd
make && make install

3. Open the php.ini file and add the following extended configuration

extension=swoole.so

4. Restart PHP to make the extension take effect

3. Use Swoole for server development

Below we will use a simple The HTTP server program is taken as an example to introduce how to use Swoole for server development.

1. Create an HTTP server file, name it http_server.php, and write the following code:

$server = new SwooleHttpServer("0.0.0.0", 9501);

$server->on("start", function () {

echo "HTTP server started at http://0.0.0.0:9501

";
});

$server-> on("request", function ($request, $response) {

$response->header("Content-Type", "text/plain");
$response->end("Hello World

");
});

$server->start();
? >

2. Run the program

php http_server.php

3. Test the program

Enter http://127.0.0.1 in the browser :9501, if you can see the words "Hello World", it means the program runs successfully.

4. Multi-process mode

In multi-process mode, Swoole can handle multiple requests at the same time, thereby improving the concurrent performance of the server. The code below demonstrates how to use multi-processing in Swoole.

$server = new SwooleHttpServer("0.0.0.0", 9501);

$server->set([

"worker_num" => 4,

] );

$server->on("start", function () {

echo "HTTP server started at http://0.0.0.0:9501

";
});

$server->on ("request", function ($request, $response) {

$response->header("Content-Type", "text/plain");
$response->end("Hello World

");
});

$server->start();
?> ;

In the above code, we use the set function to set the worker_num parameter to 4, which means starting 4 processes for processing.

5. Coroutine mode

In coroutine mode, Swoole uses single-threaded coroutine to better control the use of resources, thereby reducing server overhead and improving server performance. The code below demonstrates how to use coroutines in Swoole.

$server = new SwooleHttpServer("0.0.0.0", 9501);

$server->set([

"worker_num" => 1,

] );

$server->on("start", function () {

echo "HTTP server started at http://0.0.0.0:9501

";
});

$server->on ("request", function ($request, $response) {

$response->header("Content-Type", "text/plain");
swoole_coroutine_create(function () use ($response) {
    $result = file_get_contents("http://www.baidu.com");
    $response->end($result);
});

});

$server->start();
?>

In the above code, we use the swoole_coroutine_create function in the request handler to enable the coroutine, and then use the file_get_contents function to obtain the content of Baidu homepage and send the result to the client.

6. WebSocket Mode

In WebSocket mode, Swoole can communicate through the WebSocket protocol, thereby achieving two-way communication. The following code demonstrates how to use the WebSocket protocol in Swoole.

$ server = new SwooleWebSocketServer("0.0.0.0", 9501);

$server->on("start", function () {

echo "WebSocket server started at ws://0.0.0.0:9501

";
});

$server->on("open", function ($server, $request) {

echo "WebSocket connection open: fd={$request->fd}

";
});

$server- >on("message", function ($server, $frame) {

echo "Received message: {$frame->data}

";

$server->push($frame->fd, "Server received: {$frame->data}");

});

$server->on(" close", function ($server, $fd) {

echo "WebSocket connection close: fd={$fd}

";
});

$server->start();
?>

In the above code, we use the WebSocketServer class to start the WebSocket server and process it through open, message, and close events.

7. Conclusion

In this article, we introduce Learn how to use Swoole extensions in PHP for server development, including multi-process mode, coroutine mode and WebSocket mode, making it easier to ensure server performance under high concurrency. If you need high-performance server development, you might as well try Swoole.

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