PHP implementation of WeChat applet real-time push techniques

With the widespread application of WeChat mini programs, real-time push has become a very important requirement. In WeChat mini programs, real-time push can allow users to obtain data updates in real time, thus improving user experience.

In this article, we will introduce how to use PHP to implement real-time push techniques for WeChat mini programs.

1. What is WeChat mini program real-time push?

Real-time push of WeChat mini program means that when new data is generated, the system pushes data updates to the mini program in real time through websocket or polling, so that users can see the changes in data in real time and improve user experience. experience.

2. How to use PHP to implement real-time push of WeChat mini programs?

1. Preparation work

Before using PHP to implement real-time push of the WeChat mini program, you need to complete the following preparation work:

• Configure the websocket server in the background of the mini program
• Install the swoole extension
• Write the websocket server code that interfaces with the mini program

2. Install the swoole extension

Swoole is a version of PHP extension, it allows PHP to support asynchronous programming and coroutines, which is very suitable for the development of websocket servers. Before using swoole, you need to install the swoole extension first:

pecl install swoole

After the installation is completed, add the swoole extension to the php.ini file:

extension=swoole.so

Restart PHP and confirm that the swoole extension has been successfully installed.

3. Write the websocket server code

Next, we need to write the websocket server code that interfaces with the mini program. Before that, you need to configure the websocket server in the background of the mini program and obtain the following information:

• Server address
• Port number
• Encryption method
• URL path

The following is the basic structure of PHP's websocket server code:

use SwooleWebSocketServer;

$server = new Server('0.0.0.0', 9501);

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

});

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

});

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

});

$server->start();

• 0.0.0.0 is the IP address of the server;
• 9501 is the port number of the websocket server.

In the on('open') event, process the logic when a new user connects; in the on('message') event, process The logic when receiving the message; in the on('close') event, handle the logic when the user disconnects.

4. Realize the connection with the mini program

After the websocket server is started, it needs to realize the connection with the mini program. The WeChat applet requires parameters such as password, signature and timestamp when establishing a websocket connection.

The following is the code in PHP that handles the websocket connection request of the mini program:

$server->on('open', function ($server, $request) {
    $signature = $request->header['sec-websocket-protocol'];
    $token = ""; // 小程序在后台配置的口令（Token）
    $timestamp = ""; // 当前时间戳

    // 计算签名
    $hash = sha1($token . $timestamp);
    if ($signature !== $hash) {
        $server->close($request->fd);
    }
});

In this code, the signature (ie password) passed by the mini program is first obtained from the HTTP header, Then use the SHA1 algorithm to calculate the signature hash value with the Token configured in the background of the mini program and the current timestamp. Finally, verify whether the hash value is consistent with the signature passed by the mini program. If it is inconsistent, close the connection. .

5. Implement active push

After establishing a websocket connection with the mini program, you can actively push data to the mini program. The following is the code to implement active push in PHP:

$server->on('message', function ($server, $frame) {
    // 从客户端接收到消息
    $data = json_decode($frame->data, true);

    // 处理客户端发送的数据
    // ...

    // 主动向客户端推送数据
    $server->push($frame->fd, json_encode($result));
});

In this code, the message is first received from the client, then the data sent by the client is processed, and the data that needs to be pushed is generated. Finally, the push() method is used to actively push the message to the client. Push data to the end.

3. Summary

This article introduces the techniques of using PHP to implement real-time push of WeChat mini programs. By using the swoole extension and websocket server, we can achieve real-time docking with the mini program, thereby pushing data in real time and improving the user experience of the mini program.

Of course, the above code is just a simple example, and it needs to be improved according to specific business needs in actual use. Hope this article will be helpful to you.

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