How to use PHP to implement the instant messaging function in WeChat applet

With the continuous development of mobile Internet, WeChat applet has become an indispensable mobile application. It is convenient and fast, takes up little resources, and is more suitable for the development of some lightweight applications. With the popularity of WeChat mini programs, more and more developers are beginning to pay attention to the real-time messaging function of mini programs, which is the so-called instant messaging function. This article will tell you how to use PHP to implement the instant messaging function in WeChat applet.

1. Understand the instant messaging function of WeChat Mini Program

The instant messaging function of WeChat Mini Program can be divided into two parts, one is instant messaging within the application, and the other is Instant messaging outside of the app. Instant messaging within the application is mainly realized through the cloud development platform built into the WeChat applet; while instant messaging outside the application requires the use of third-party instant messaging services, such as Aurora IM.

2. Enable the cloud development function of the WeChat mini program

Before implementing the instant messaging function of the WeChat mini program, we need to enable the cloud development function. In WeChat Developer Tools, select "Cloud Development" and create a new cloud development environment. In the cloud development environment, we need to create a database collection to store instant chat messages, and write corresponding cloud functions to send and receive messages.

3. Writing PHP code to implement instant messaging

PHP is a server-side scripting language commonly used for web development. When implementing WeChat applet instant messaging, we can use PHP with cloud development to send and receive messages. The following is a sample code:

//消息发送
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, 'https://api.weixin.qq.com/cgi-bin/message/custom/send? 
access_token='.$access_token);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $postData);
curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);
$resp = curl_exec($ch);
curl_close($ch);

//消息接收
$url = 'https://api.weixin.qq.com/wxa/business/getliveinfo'; 
$ch = curl_init($url);
$options = array(
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => array('Content-type: application/json'),
    CURLOPT_POSTFIELDS => json_encode($data)
);
curl_setopt_array($ch, $options);
$results = curl_exec($ch);
curl_close($ch);

Among them, $access_token represents the access_token value of the WeChat applet, $postData represents the content of the message sent, and $data represents the content of the message received.

4. Calling PHP code to implement the instant messaging function

When calling PHP in the WeChat applet to implement the instant messaging function, it needs to be called through the applet cloud development. The specific calling method is as follows:

// 引入SDK
const cloud = require('wx-server-sdk')

// 获取云函数中的环境ID
const env = cloud.getWXContext().ENV

exports.main = async (event, context) => {
  // 初始化
  cloud.init({ env })

  // 调用云函数发送消息
  let result = await cloud.callFunction({
    name: 'sendMsg', // 云函数的文件名
    data: {
      openid: event.openid, // 发送用户的openid
      content: event.content // 发送的消息内容
    }
  })

  // 响应结果
  return result
}

Through the above code, we can successfully call the PHP code to implement and implement the instant messaging function in the WeChat applet.

Summary

The instant messaging function of the mini program is very important for some applications. Through the introduction of this article, you should already know how to use PHP to implement the instant messaging function in WeChat applet. If you want to learn more about this topic, you can learn related knowledge.

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