How to install and call Swoole (step sharing)

Swoole is a network communication framework based on PHP language. It can provide asynchronous, concurrent, high-performance HTTP, WebSocket and TCP/UDP protocol servers and clients. It is very useful when developing Web services and network communication applications. Large use, widely used in some Internet companies.

This article will introduce how to use Swoole call.

1. Install Swoole

Before using Swoole, you need to install it first. You can use Composer or manually download and install it into the PHP extension. The steps are as follows:

1. Use Composer to install

Enter the command in the command line: composer require swoole/swoole, that is The latest version of Swoole can be installed.

2. Manual download and installation

Download Swoole’s source code compression on Swoole’s official website (https://www.swoole.com/) package, unzip it and execute the following command on the command line to install:

$ phpize
$ ./configure
$ make && make install

2. Call Swoole

1. Create service

Before starting the Swoole service, you need to create the service first. You can create HTTP, WebSocket, TCP/UDP and other types of services. Take HTTP service as an example:

$serv = new Swoole\Http\Server("127.0.0.1", 9501);

2. Register callback function

After creating the service, you need to The callback function is registered in the service. The callback function is the processing logic after the server receives the client request, such as responding to the request, processing data, etc. In the HTTP service, you can have the following callback functions:

(1)onStart

When the service starts, execute this function.

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

(2)onRequest

Execute this function when an HTTP request is received.

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

(3)onClose

Execute this function when the connection is closed.

$serv->on('close', function ($server, $fd) {
echo "client {$fd} close\n";
});

3. Start the service

After completing the service creation and registration of the callback function, you need to start the service.

$serv->start();

In this way, a simple HTTP service is created.

3. Implement asynchronous non-blocking

Swoole has features such as coroutine, asynchronous, and non-blocking, and can achieve both synchronous blocking and asynchronous non-blocking. Using the coroutine feature provided by Swoole can greatly improve the performance of PHP programs.

Next, let’s take a look at how to implement asynchronous non-blocking communication.

1. Create an asynchronous client

You can create an asynchronous TCP client through the following code:

$client = new Swoole\Coroutine\Client(SWOOLE_TCP, SWOOLE_ASYNC);

2. Connect to the server

To use an asynchronous client to send a connection request to the server, you need to set a connection callback function.

$client->connect('127.0.0.1', 9501, function ($client) {
$client->send("hello world");
});

3. Receive the data returned by the server

After the connection is successful, use the recv method to receive the data returned by the server. You also need to set a callback function.

$client->recv(function ($client, $data) {
echo "received data: {$data}\n";
});

4. Execution program

Using the coroutine feature provided by Swoole, you can perform coroutine suspension and other operations without blocking program execution.

Swoole's asynchronous non-blocking feature can greatly improve program performance, especially in high concurrency, network communication and other scenarios. Using Swoole to develop network communication applications can easily implement asynchronous non-blocking communication, improve the throughput of the server, and thereby improve the user experience.

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