How to use PHP to scan the QR code with parameters and jump to the page

With the popularity and development of mobile payment, QR code scanning payment method has become the first choice for more and more people, and PHP, as a popular dynamic language, is increasingly used in QR code-related applications. coming more and more widely. This article will introduce how to use PHP to scan QR codes and jump to related technologies. I hope it will be helpful to the majority of developers.

1. Principle of QR code scanning

The QR code is a QR code symbol that encodes information in the form of a matrix and is often used in scenarios such as scanning for payment. QR code scanning technology uses the mobile phone camera to receive the QR code image, and analyzes it through image processing algorithms to extract the information in the QR code.

The QR code usually encodes a URL address. This address is the address of the page that the user needs to visit. By scanning the QR code to obtain this address, you can jump to the corresponding page. Therefore, QR code scanning and page jump are closely related.

2. PHP implements the QR code scanning function

To implement the QR code scanning function in PHP, two class libraries are required. One is the PHP QR Code class library, which is used to generate QR code pictures; the other is the ZBar scanning library, which provides image processing functions and can identify barcodes and QR codes in images.

First you need to install these two libraries, you can use Composer to install:

composer require phpqrcode/phpqrcode composer require zkatz/zbarcode

Then you can write PHP code to implement the QR code scanning function:

// 引入类库 require_once 'vendor/autoload.php'; // 生成二维码图片 $url = 'http://example.com'; // 要生成二维码的URL地址 QRcode::png($url); // 扫描二维码 $img = imagecreatefrompng('qrcode.png'); // 二维码图片路径 $scanner = new ZBarcodeScanner(); $scanner->scan($img); // 获取结果 $results = $scanner->getResults(); if (!empty($results)) { $url = $results[0]->getData(); // 获取扫描结果中的URL地址 header('Location: ' . $url); // 跳转到扫描结果的页面 }

The above code , first call the png method of the QRcode class to generate a QR code image, and hand the QR code image to the ZBar scanning library for processing, obtain the URL address in the scan result, and jump to the page of the scan result.

3. Page jump with parameter QR code

Sometimes we need to bring parameter information in the QR code and perform some special processing on the jumped page. For example, the QR code of a shopping cart can contain the ID and quantity information of the product. When the user scans the QR code, he or she can jump to the shopping cart page and automatically add products to the shopping cart.

In PHP, parameter information can be added to the QR code through URL parameters. In the jumped page, you can obtain these parameter information through the $_GET global variable, and then perform related processing.

The following is a sample code for adding parameter information to the QR code and jumping to the page with parameters:

// 要跳转的URL地址 $url = 'http://example.com/cart.php'; // 要传递的参数信息 $params = array( 'id' => 123, 'qty' => 2 ); // 将参数信息拼接到URL地址后面 $url .= '?' . http_build_query($params); // 生成带参数的二维码 QRcode::png($url);

Then in the jumped page, you can use the following Code to obtain parameter information:

// 获取参数信息 $id = isset($_GET['id']) ? $_GET['id'] : 0; $qty = isset($_GET['qty']) ? $_GET['qty'] : 0; // 进行相关的处理 // ...

IV. Summary

This article introduces how to use PHP to implement related technologies of QR code scanning and page jump. Through these technologies, we can easily apply QR codes in payment, shopping cart and other scenarios to improve user experience and life convenience. At the same time, developers can also optimize and expand these technologies to achieve more interesting and practical applications.

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