How to implement WeChat scanning function in PHP

With the popularity of mobile Internet, WeChat has become an indispensable part of people's lives. Not only functions such as chat, circle of friends, payment, etc., but also a very practical function - WeChat scanning. Use WeChat to scan to quickly access the website, register users, make payments and other operations. Today, let’s discuss how to use PHP to implement WeChat scanning.

1. Introduction to WeChat Scan

WeChat Scan is a function based on QR code technology. Users can open WeChat and use the camera of their mobile phone to scan the QR code to quickly Access the website, register as a user, make payments and other operations.

WeChat Scan involves the following concepts:

1. QR code: It is a matrix barcode that can store data. WeChat Scan is to scan the QR code To achieve identification and operation.
2. WeChat public account: refers to an individual, enterprise or organization that is registered and approved on the WeChat platform and can provide services to users. To use the WeChat scan function, you need to configure relevant information in the official account.
3. WeChat Open Platform: It is an open interface and tool provided by WeChat, which can help developers quickly develop WeChat-related applications and functions.

2. Configure the WeChat public account

Before using PHP to implement the WeChat scan function, you need to configure the WeChat public account first. The specific steps are as follows:

1. Register a WeChat official account

Users can apply to register a WeChat official account and get the name and number of an official account.

2. Certified public account

Certified public account requires company business license, organization code certificate, tax registration certificate, legal person ID card and other relevant information, which can only be approved after passing the review Certified. After certification, you can obtain more permissions and functions in the WeChat public platform.

3. Configuring a public account

Configuring a public account requires binding the WeChat public account to the appropriate server, and setting up custom menus, automatic replies, graphic messages, etc. .

3. Use PHP to implement the WeChat scanning function

After configuring the WeChat public account, you can set related functions in the Developer Center. Using PHP to implement the WeChat scan function requires the following steps:

1. Get Access Token

Access Token is required to call the WeChat interface. We can obtain Access through the following code Token:

$url = "https://api.weixin.qq.com/cgi-bin/token?grant_type=client_credential&appid={$appid}&secret={$appsecret}"; 
$res = file_get_contents($url); 
$res = json_decode($res, true); 
$access_token = $res['access_token'];

2. Generate QR code

Using PHP to generate QR code requires the use of the qrcode module:

require('qrcode/phpqrcode.php'); 
$value = 'http://www.xxx.com'; 
$errorCorrectionLevel = 'L'; 
$matrixPointSize = 6; 
QRcode::png($value, 'qrcode.png', $errorCorrectionLevel, $matrixPointSize, 2);

This code will generate a A QR code image named qrcode.png.

3. Identify QR code

Using the WeChat scan function, users can identify and upload the QR code to the server. To use PHP to identify QR codes, you need to use the Zxing module:

require_once ('Zxing.class.php'); 
$zxing = new Zxing(); 
$result = $zxing->decode('qrcode.png');

This code will read the QR code image named qrcode.png, identify it and return the identification result.

4. Notes

You need to pay attention to the following points when using PHP to implement the WeChat scan function:

1. You need to configure the server in the WeChat public account Information, including URL and Token.
2. When accessing the API interface, you need to pay attention to the request limit and validity period of the Access Token, otherwise the API interface may not return the results correctly.
3. When generating a QR code, you need to ensure that the content of the QR code is correct and accessible, and the image size is appropriate.
4. When identifying QR codes, you need to pay attention to the clarity and quality of the picture, otherwise it may not be recognized correctly.

5. Summary

The WeChat scan function is a very practical function that can help users quickly complete various operations. To use PHP to implement the WeChat scan function, you need to configure the WeChat official account and comply with the corresponding specifications to achieve normal QR code recognition and functional operations.

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