PHP generates QR code

Question

I want to use PHP to create a QR code for an information filling interface like the one below. The QR code is bound to the workstation. After scanning the code at different workstations, different information will be brought out from the database. A newbie who doesn’t know what to do? Please help me guys and teach me

Answer 1

QR code is one of the important ways of transmitting information in modern society. Whether it is product marketing, government announcements, or the transmission of information such as tickets and business cards, QR codes play a vital role. The QR code generation function in PHP language has become an indispensable part of the development process of many websites and applications. The following will introduce how to use PHP language to generate QR codes.

1. Install the PHP QR Code library

To generate QR codes in PHP language, you need to use the PHP QR Code library. The latest version of the library can be downloaded from GitHub or installed using Composer.

2. Introducing the QR Code library

The way to introduce the QR Code library into a PHP file is very simple. You only need to put the downloaded folder of the QR Code library into the directory where the current PHP file is located. , and then use require_once to load the PHP QR Code library.

3. Generate QR code

The core code for generating QR code is as follows:

// 引入QR Code库
require_once 'phpqrcode.php';
// 存放二维码的文件名，可根据需要修改
$filename = 'qrcode.png';
// 二维码内容
$content = 'https://example.com';
// 二维码大小
$size = 10;
// 二维码错误纠正级别
$error_correction = 'L';
// 二维码边距大小
$margin = 4;
// 生成二维码图片
QRcode::png($content, $filename, $error_correction, $size, $margin);

In the above code, the QRcode::png() method is the PHP QR Code library The core method in , its parameters are: QR code content, file name to store QR code, QR code error correction level, QR code size, QR code margin size.

4. Output the QR code

The code to output the generated QR code to the page is as follows:

// 输出二维码
echo '<img src=&quot;' . $filename . '&quot; />';

In the above code, $filename is the generated QR code QR code file name, you can put it in the <img> tag to output the QR code image.

5. Improvement

The above code is the most basic implementation method for QR code generation, but in fact there is still a lot of room for further improvement. For example, if a QR code needs to be used in multiple files, the above code needs to be written every time, which is highly repetitive. In this case, the code that generates the QR code can be encapsulated into a function and can be called at any time where needed. In addition, by adjusting parameters such as QR code size and error correction level, the recognition efficiency of QR codes can be further improved.

6. Summary

To generate a QR code in PHP language, you need to install the PHP QR Code library and generate a QR code by calling the core method. By encapsulating the code that generates QR codes into functions, code reusability can be improved and development efficiency improved. The size, error correction level and other parameters of the final generated QR code can also be adjusted according to actual needs.