With the rapid development of mobile Internet, QR code technology has been widely used in various fields. In the Internet world, people often need to share links or QR codes with others to obtain information or communicate. Therefore, how to quickly generate QR codes and convert links into QR codes are issues that many developers are concerned about. This article will introduce how to use PHP to automatically convert links into QR codes.

1. Generate QR code
In PHP, we can use the "QR code generator class" to generate QR code images. This class can be downloaded from the Internet. After downloading, we need to introduce this class and instantiate it. The specific code is as follows:

include?'phpqrcode.php';
QRcode::png('https://www.example.com');

In the above code, we use the include statement to introduce the phpqrcode.php file into our php page. Then, we use the QRcode::png method to generate our link https://www.example.com into a QR code. We can generate this QR code into the page, as follows:

$img?=?'<img src="&#39;.QRcode::png(&#39;https://www.example.com&#39;).&#39;" />';

In this way, we can quickly generate a QR code through this method.

2. Convert the link into a QR code
In practical applications, we often need to directly convert the link into a QR code so that we can obtain the link information by scanning the QR code. Next, we will introduce how to convert links into QR codes.

First, we need to get the link that needs to be converted, which can be obtained through PHP code:

$link?=?'https://www.example.com';

Then, we need to define the size of the QR code image, as well as related parameters such as error correction level . Here we use H error correction level with size 3.

$size?=?3;?//?生成的二維碼圖片大小
$errorCorrectionLevel?=?'H';?//?糾錯(cuò)等級(jí)：L、M、Q、H

Next, we need to introduce the QR code generator class to generate a QR code image, and store the generated QR code image locally:

include?'phpqrcode.php';?//?引入二維碼生成類文件
$filename?=?'qrcode.png';?//?二維碼圖片名稱
$path?=?'./';?//?二維碼圖片存放路徑
$fullPath?=?$path?.?$filename;?//?完成文件路徑
QRcode::png($link,?$fullPath,?$errorCorrectionLevel,?$size);?//?生成二維碼

Finally, we will generate the QR code image The code image is displayed:

$json?=?array(
??'link'?=>?$link,
??'qrcode'?=>?$filename
);
echo?json_encode($json,?JSON_UNESCAPED_UNICODE);

In the above code, we store the name and path of the generated QR code image, and then output the link and QR code image information to the page in json data format .

3. Automatically convert QR code code
In practical applications, we often need to directly convert links into QR codes and display them on the page. Below is an example of PHP code that is automatically converted into a QR code.

<?php
header(&#39;Content-type: image/png&#39;);
include "phpqrcode.php";
$link = $_GET[&#39;link&#39;];
$size = $_GET[&#39;size&#39;] ? $_GET[&#39;size&#39;] : 4;
$errorCorrectionLevel = $_GET[&#39;error_correction&#39;] ? $_GET[&#39;error_correction&#39;] : &#39;L&#39;;
$filename = &#39;qrcode.png&#39;;
$path = &#39;./&#39;;
$fullPath = $path . $filename;
QRcode::png($link, $fullPath, $errorCorrectionLevel, $size, 2);
echo file_get_contents($fullPath);
?>

In the above code, we obtain parameters such as the link, QR code image size, and error correction level through the $_GET method. Use the QRcode::png method to generate a QR code image, and output the image to the page in the form of a binary stream.

It should be noted that the size of the QR code image generated by PHP may be relatively large, so in the actual application process, we need to adjust parameters such as image size and compression ratio according to actual needs.

To sum up, the implementation of automatically converting PHP links to QR codes is not complicated. You only need to use related libraries and classes such as QR code generator class to quickly realize automatic conversion into QR codes. Function.

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