PHP coding tips: How to generate a QR code with anti-counterfeiting verification function?

PHP coding tips: How to generate a QR code with anti-counterfeiting verification function?

With the development of e-commerce and the Internet, QR codes are increasingly widely used in all walks of life. In the process of using QR codes, in order to ensure product safety and prevent counterfeiting, it is very important to add anti-counterfeiting verification functions to the QR codes. This article will introduce how to use PHP to generate a QR code with anti-counterfeiting verification function, and attach corresponding code examples.

Before we start, we need to prepare the following necessary tools and libraries:

1. PHPQRCode: PHPQRCode is an open source PHP QR code generation library that can be used in the PHP environment Generate QR code images.
2. GD library: The GD library is a graphics library for PHP, used to handle image-related operations.
3. Database: We need a database to store the generated QR code information and corresponding anti-counterfeiting verification information.

Next, we officially start generating QR codes with anti-counterfeiting verification functions.

Step 1: Install the PHPQRCode library

First, we need to download and install the PHPQRCode library. You can find the source code for this library on GitHub and unzip it into your PHP project directory.

Step 2: Create a database table

Create a database named "qrcode" and create a table named "qrcode_table" in the database to store QR codes information and anti-counterfeiting verification information. The table structure is as follows:

CREATE TABLE qrcode_table (
    id INT(11) NOT NULL PRIMARY KEY AUTO_INCREMENT,
    code VARCHAR(255) NOT NULL,
    anti_fake_code VARCHAR(255) NOT NULL
);

Step 3: Generate QR code and store information

Next, we need to write PHP code to generate QR code and store the specified information in the database middle. The following is a code example for generating and storing a QR code:

<?php
// 引入PHPQRCode库
require_once 'phpqrcode/qrlib.php';

// 生成二维码的内容
$content = "http://example.com/product?id=1234"; // 这里是一个示例URL，请替换为你自己的内容

// 生成二维码图片的文件路径
$filename = "qrcodes/qrcode.png"; // 这里是二维码图片的保存路径，请根据你的需要修改

// 生成二维码图片
QRcode::png($content, $filename, QR_ECLEVEL_L, 10);

// 生成防伪验证码
$antiFakeCode = uniqid();

// 将二维码信息和防伪验证码存储到数据库
$con = mysqli_connect("localhost","username","password","qrcode"); // 这里请替换为你自己的数据库连接信息
$query = "INSERT INTO qrcode_table (code, anti_fake_code) VALUES ('$filename', '$antiFakeCode')";
$result = mysqli_query($con, $query);

// 关闭数据库连接
mysqli_close($con);

echo "二维码已生成并存储成功！";
?>

The above code will generate a QR code image, and store the path of the image and the generated anti-counterfeiting verification code in the database.

Step 4: Verify the authenticity of the QR code

Finally, we need to write code to verify the authenticity of the QR code. The following is an example of the verification code:

<?php
// 获取用户输入的防伪验证码
$userAntiFakeCode = $_POST['anti_fake_code']; // 这里是一个示例，请根据你的实际情况修改

// 查询数据库中对应的二维码信息
$con = mysqli_connect("localhost","username","password","qrcode"); // 这里请替换为你自己的数据库连接信息
$query = "SELECT code FROM qrcode_table WHERE anti_fake_code = '$userAntiFakeCode'";
$result = mysqli_query($con, $query);

// 判断查询结果
if(mysqli_num_rows($result) > 0) {
    $row = mysqli_fetch_assoc($result);
    echo "该二维码是真品，对应的产品信息为：" . $row['code'];
} else {
    echo "该二维码是伪造品！";
}

// 关闭数据库连接
mysqli_close($con);
?>

The above code will obtain the anti-counterfeiting verification code entered by the user and query the corresponding QR code information in the database. If the query result exists, it means that the QR code is authentic, otherwise it is a counterfeit.

Through the above steps, we successfully generated a QR code with anti-counterfeiting verification function and can verify the authenticity. You can make appropriate modifications and optimizations to the code according to your needs. I hope this article can be helpful to your PHP coding practice!

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