What are the implementation methods of server push technology in PHP7.0?

What are the implementation methods of server push technology in PHP7.0?

With the continuous development and upgrading of network technology, many websites and applications have gradually begun to adopt server push technology. Server push technology is a technology that establishes a long connection between the client and the server and pushes the data to the client in a timely manner when the server has new data. This technology is used in many real-time applications, such as trading platforms, online games, etc.

As a popular scripting language, PHP also has many implementation methods in server-side push technology. This article mainly introduces the implementation method and principle of server push technology in PHP7.0.

1. WebSocket

WebSocket is an HTML5 protocol. By establishing a long connection between the client and the server, the data can be transferred to the server in a timely manner when there is new data. Push to client. WebSocket can realize real-time communication and is suitable for scenarios that require timely two-way communication.

In PHP7.0, you can use the Ratchet library to implement WebSocket. Ratchet is an open source library for PHP that provides a WebSocket implementation that can easily implement server push.

Code example:

require 'vendor/autoload.php';

use RatcheServerIoServer;
use RatchetHttpHttpServer;
use RatchetWebSocketWsServer;
use MyAppMyClass;

$server = IoServer::factory(
    new HttpServer(
        new WsServer(
            new MyClass()
        )
    ),
    8080
);

$server->run();

2. Server-Sent Event (SSE)

Server-Sent Event (SSE) is a push technology based on HTTP , which supports the server to push text data to the client. SSE uses HTTP long connections to push data to the client when there is new data on the server. SSE is suitable for one-way communication scenarios, such as web push notifications and real-time data monitoring.

In PHP7.0, you can use the SSE library to implement SSE. The SSE library provides basic functions of server push and can be used very conveniently in PHP applications.

Code sample:

require 'vendor/autoload.php';

use SpatieSseSse;

$sse = new Sse();

while(true) {
    // 从数据库中查询需要推送的数据
    $data = fetchData();

    $sse->sendEvent('message', $data);

    // 设置推送间隔
    sleep(1);
}

3. Long Polling

Long Polling is a technology that obtains data from the server through polling. When the client sends a request to the server, the server does not respond to the request immediately, but waits for data to be updated before returning a response to the client. Afterwards, the next request is initiated while the client receives the response. Using Long Polling can achieve real-time communication effects similar to WebSocket.

In PHP7.0, you can use the ReactPHP library to implement Long Polling. ReactPHP uses an asynchronous non-blocking I/O model to efficiently handle multiple requests.

Code example:

require 'vendor/autoload.php';

use ReactEventLoopFactory;
use ReactHttpResponse;
use ReactHttpServer;

$loop = Factory::create();

$server = new Server(function ($request, $response) use ($loop) {
    // 从服务端获取数据 
    $data = fetchData();

    // 发送响应到客户端
    $response->writeHead(200, array('Content-Type' => 'text/event-stream', 'Cache-Control' => 'no-cache', 'Connection' => 'keep-alive'));
    $response->write("data: ".$data."n");

    // 设置超时时间，关闭长连接
    $loop->addTimer(30, function() use ($response){
        $response->write("event: close".PHP_EOL.PHP_EOL); 
        $response->end();
    });
});

$server->listen(8080);

$loop->run();

Summary

The server push technology in PHP7.0 has three implementation methods: WebSocket, Server-Sent Event and Long Polling. Different technologies are suitable for different scenarios, and developers can choose the appropriate technology according to their own needs.

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