How to implement the IM chat function of WeChat applet in PHP

As WeChat mini programs become more and more popular, many companies and individuals have begun to develop businesses on WeChat mini programs, and the most common function is to implement chat functions. For PHP developers, how to implement IM chat function in WeChat applet is a problem that cannot be ignored.

In this article, we will implement the IM chat function in the WeChat applet based on the IM API officially provided by the WeChat applet and combined with the characteristics of the PHP language.

1. Preparation

Before you start, you need to complete the following preparations:

1. Have your own WeChat mini program and have passed the WeChat review.

2. Be familiar with the development of WeChat mini programs, including understanding the life cycle of WeChat mini programs, network requests, message push, etc.

3. Have basic knowledge of PHP language and understand the syntax and function library of PHP language.

2. Obtain access_token

In scenarios such as WeChat public accounts or mini programs, it is often used as a credential (access_token) for access interfaces. The steps to obtain it are as follows:

Step 1: Create your own mini program on the WeChat public platform and obtain the mini program ID and secret key.

Step 2: Use the interface to obtain access_token and obtain the access_token through the ID and secret key of the applet.

Request URL:

https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid=mini program ID&secret=mini program secret key

Request method:

GET request

The request example is as follows:

https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid= wxXXXXXXXXXXXXXXXXXX&secret=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

Note: Please replace the Mini Program ID and Mini Program secret key in the above request with your own.

After the request is successful, you will get a return value in JSON format, which contains access_token information.

{

"access_token":"ACCESS_TOKEN",
"expires_in":7200

}

3. Prepare to call the WeChat applet IM API

You need to use it to call the WeChat applet IM API in PHP CURL function library, therefore, next we will introduce how to use the CURL function library to call the WeChat applet IM API.

1. Construct request parameters

To call the WeChat applet IM API, you first need to construct the request parameters and convert them into a string in JSON format. The parameter list is as follows:

Parameter name type description
access_token string Calling credentials

First define an array, and then fill the array with the value of the access_token parameter. The code is as follows:

$access_token = '[Your access_token 】';
$data = [
'access_token' => $access_token
];

2. Send POST request

Use CURL function library to send POST request , create a customer service session through the WeChat applet IM API. The code is as follows:

$ch = curl_init();
$url = 'https://api.weixin.qq.com/cgi-bin/customservice/kfsession/create?access_token='.$ access_token;
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, json_encode($data));
$result = curl_exec($ch);
curl_close($ch);

Among them, $url is the address to be requested, which is determined by the WeChat applet IM API provided. $result is the result returned by the request.

4. Call the IM API in the WeChat applet

In the WeChat applet, developers can send requests to the server through the wx.request() function and process the response data. When sending a request, you need to pass in the following parameters: request URL, request method, request header, request data, etc.

Let’s take a look at how to send a request to the WeChat IM API in the WeChat applet.

1. Construct the request URL

Construct the request URL and use access_token as one of the request parameters. The URL example is as follows:

https://api.weixin.qq.com/cgi-bin/customservice/kfsession/create?access_token=ACCESS_TOKEN

2. Build request method

The request method is POST.

3. Construct request data

According to the requirements of WeChat IM API, construct the request data format as a string in JSON format. The code is as follows:

var requestData = {
access_token: '[Your access_token]'
};

4. Send a request

Send a request, for example ：

wx.request({
url: url,
method: 'POST',
header: {

   'content-type': 'application/json'

},
data: JSON. stringify(requestData),
success: function(res) {

   console.log(res);

}
});

where url is the constructed request URL, method is the POST method, and header The request header type is specified as application/json, and data is the request data.

5. Summary

Through the above steps, we can implement the IM chat function in the WeChat applet to meet the user's interactive needs. Of course, the above is just a basic structure for realizing the IM chat function, and developers still need to modify and improve it according to their actual needs.

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