Implementation of QR code generation and scanning function using PHP and mini program

Implementation of QR code generation and scanning functions in PHP and mini programs

With the development of technology, QR codes have become a common method of information transmission in our lives. In Internet applications, QR codes are increasingly used. This article will introduce how to use PHP and small program development to realize the generation and scanning functions of QR codes.

1. Generate QR code with PHP

It is very simple to generate QR code in PHP, you only need to use some third-party libraries. Among them, PHP QR Code is a commonly used library through which QR codes can be generated.

First, we need to introduce the PHP QR Code library into the PHP project. You can use Composer to manage dependencies and install the library by running the following command in the terminal:

composer require endroid/qrcode

After successful installation, we can generate the QR code through the following code:

require_once 'vendor/autoload.php';

use EndroidQrCodeQrCode;

$qrCode = new QrCode();
$qrCode->setText('Hello World!')
       ->setSize(300)
       ->setPadding(10)
       ->setErrorCorrection('high')
       ->setImageType(QrCode::IMAGE_TYPE_PNG);

$qrCode->render();

The above code , first we introduced the QrCode class through the use statement. Then, create a QrCode object and set the text content, size, margins, error correction level and image type of the QR code. Finally, call the render() method to generate and display the QR code.

2. Mini program scans QR codes

In the mini program, we can use the wx.scanCode interface to implement the function of scanning QR codes. The following is a simple sample code:

wx.scanCode({
  success: function (res) {
    console.log(res.result)
  }
})

In the above code, we open the QR code scanning interface of the mini program by calling the wx.scanCode interface. When the user scans successfully, the success callback function will be executed, and res.result contains the content of the scanned QR code.

3. PHP generates a QR code for the applet to scan

Now, we have to implement a function: generate a QR code in PHP, and then use the applet to scan it.

First, we need to use the PHP QR Code library mentioned in the previous section in PHP to generate the QR code. Then, save the generated QR code as an image and provide it to the mini program for use.

The following is a sample code:

require_once 'vendor/autoload.php';

use EndroidQrCodeQrCode;

$qrCode = new QrCode();
$qrCode->setText('https://www.example.com')
       ->setSize(300)
       ->setPadding(10)
       ->setErrorCorrection('high')
       ->setImageType(QrCode::IMAGE_TYPE_PNG);

$filePath = '/path/to/qrcode.png';
$qrCode->save($filePath);

echo $filePath;

In the above code, we first create a QrCode object and set the text content, size, and margins of the QR code , error correction level and picture type. Then, call the save() method to save the QR code as a picture and output the save path.

In the mini program, we can use the wx.previewImage interface to display the generated QR code. The following is a sample code:

wx.downloadFile({
  url: 'https://www.example.com/path/to/qrcode.png',
  success: function (res) {
    wx.previewImage({
      urls: [res.tempFilePath]
    })
  }
})

In the above code, we use the wx.downloadFile interface to download the generated QR code image, and after success, pass wx.previewImageInterface to preview pictures.

To sum up, using PHP and small program development can easily realize the generation and scanning functions of QR codes. Through the PHP QR Code library, you can easily generate QR codes in PHP and implement the scanning function in the mini program. Through the above sample code, we can simply implement a PHP function that generates a QR code for the mini program to scan.

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