PHP scans the QR code to jump to the page.

With the widespread application of QR codes, more and more websites and applications need to implement the function of jumping to a specified page by scanning the QR code. In PHP, it is not difficult to implement this function. This article will introduce how to use PHP to realize the function of jumping to a specified page by scanning a QR code.

1. Generate QR code

First, we need to generate QR code. In PHP, you can use third-party libraries to generate QR codes. Here we use the PHP QR Code library to generate QR codes. After downloading the library file, you can directly include it and use it. The following is a sample code to generate a QR code:

include "phpqrcode.php";
//二维码内容
$data = "http://www.example.com";
//容错级别 
$errorCorrectionLevel = "L";
//生成图片大小 
$matrixPointSize = 10;
//生成二维码图片 
QRcode::png($data, false, $errorCorrectionLevel, $matrixPointSize);

2. Identify the QR code

After generating the QR code, you need to display the QR code on the page and scan it QR code to identify the QR code. In PHP, you can use the third-party library phpqrcode-reader to identify QR codes. After downloading the library file, you can directly include it and use it. The following is a sample code for identifying the QR code:

include "qrcode_reader.php";
//二维码图片路径 
$file = 'qrcode.png'; 
//解码 
$qrcode = new QRcodeReader(); 
$result = $qrcode->decode($file); 
//输出结果 
echo $result->text;

3. Jump to the page

After identifying the QR code, you need to jump to the corresponding page based on the content of the QR code. page. In PHP, you can use the header function to implement page jumps. The following is a sample code to jump to the page:

//二维码中包含的URL 
$url = "http://www.example.com";
//跳转至指定页面 
header("Location: $url");

4. Complete sample code

The following is a code that will generate a QR code, identify the QR code by scanning the QR code, and scan the QR code based on the QR code. The complete sample code for jumping the content in the QR code to the corresponding page:

include "phpqrcode.php";
include "qrcode_reader.php";

//处理页面请求
if($_SERVER['REQUEST_METHOD'] == 'GET') {
    //获取二维码中包含的URL 
    $url = $_GET['url'];
    //生成二维码 
    QRcode::png($url, false, 'L', 10);
} else if($_SERVER['REQUEST_METHOD'] == 'POST'){
    //获取二维码图片路径 
    $file = $_FILES['qrcode']['tmp_name'];
    //解码二维码 
    $qrcode = new QRcodeReader();
    $result = $qrcode->decode($file);
    //跳转页面 
    header("Location: $result->text");
}

On the page, you can display the generated QR code in the following ways, and jump to the corresponding page by scanning the QR code. ：

<!-- 生成二维码 -->
<img src="qrcode.php?url=http://www.example.com"/>

<!-- 扫描二维码 -->
<form method="post" action="">
    <input type="file" name="qrcode">
    <input type="submit" value="提交">
</form>

With the above code, you can realize the function of jumping to the specified page by scanning the QR code.

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