Preface
Due to the functional needs of the team, we need to use PHP to make a QR code based on Our action of generating a QR code from the given URL is a tortuous process. I will summarize it here after it is completed.
Start
At the beginning, I went in the wrong direction. My thinking at the time: Since you want to generate a QR code, you need to know how to generate a QR code. mechanism, so I searched for QR codes on the Internet and got the following results: 
我粗略读了一遍之后顿悟： 显然，这不是我想要的（如果研究这东西，估计未来几周不用干别的了）
On the right track
Although I went in the wrong direction, I still understand it simply Now that we know the QR code, how can we implement the functions we need? This time I decided to be simple and crude
Google was honest with me. Someone had already written these functions before me, so I started to get on the right track.
Overall idea
- The functions we need have been written in PHP on the Internet. Just like we quoted the library in think, we only need to generate QR codes online Download the library and then reference it to generate a QR code quickly and conveniently. With the idea settled, let’s start working.
The author found two methods, and finally used the second one
Method 1: Composer and endroid/QrCode
- Mentioned php download section For third-party libraries, we must mention composer. This is a powerful library management tool in PHP that can help us download other libraries on the Internet. This magical thing is also introduced in the official documentation (as shown below)
- Currently, the author is using the windows environment. I downloaded it according to the link in the official document and started happily going all the way to next. Then the problem came
This is a photo I found online (from the novice tutorial: composer installation). When I installed it, no address appeared, so I was confused. This is What's the meaning?
After thinking about it, the management tool we installed is related to php, and we need to find the php.exe file in the novice tutorial picture, which leads to the following question: Where is php?
-
XAMPP
Baidu Encyclopedia: XAMPP (Apache MySQL PHP PERL) is a powerful website building integration software package. It can be seen that the xampp we use has PHP integrated in it. Next, start looking for files
找到文件，安装完成，在我们的thinphp5文件夹下，输入指令来安装好第三方库 $ composer require endroid/qr-code
In this way, our library file After loading, if you want to develop code, you can refer to this blog
http://www.cnbreak.org/biancheng/thinkphp5/wechatwebpage/760.html
Method 2: Use phpqrcode
The author uses this method, and it is relatively simple to use (but it seems that it cannot be used in thinkphp6). We download the third-party library directly from the Internet
Download link https:// sourceforge.net/projects/phpqrcode/files/releases
Official documentation http://phpqrcode.sourceforge.net/docs/html/annotated.html
After downloading
Note: It must be in the extends directory
The library we downloaded with composer is in vender, and the third-party library downloaded from outside will only work if it is placed in extends.
The following is the code for the second method
function qrcode($level = 'L', $size = 4){
// 导入Phpqrcode插件文件require_once EXTEND_PATH.'phpqrcode/phpqrcode.php';
//设置url
$url1 = 'https://www.baidu.com/s?wd=666&rsv_spt=1&rsv_iqid=0xfea0cab90000241d&issp=1&f=8&rsv_bp=1&rsv_idx=2&ie=utf-8&tn=baiduhome_pg&rsv_enter=1&rsv_dl=ib&rsv_sug3=4&rsv_sug1=3&rsv_sug7=100&rsv_sug2=0&rsv_btype=i&inputT=528&rsv_sug4=1203';
// 容错级别
$errorCorrectionLevel = $level;
// 生成图片大小
$matrixPointSize = intval($size);
// 生成二维码图片
$object = new QRcode();
// 这个一定要加上，清除缓冲区
ob_end_clean();
// 第二个参数false的意思是不生成图片文件，如果你写上‘picture.png’则会在根目录下生成一个png格式的图片文件
$object->png($url1, false, $errorCorrectionLevel, $matrixPointSize, 2);
}The meaning of the relevant parameters:
- $text is the url parameter
- $outfile The default is no, no file is generated, only the QR code image is returned, otherwise the saving path needs to be given
- $level QR code Fault tolerance rate, default L(7%), M(15%), Q(25%), H(30%)
- $size QR code image size, default 4
- $ margin The size of the blank area of the QR code
- $saveabdprint The QR code is saved and displayed. $outfile must pass the path
- $back_color Background color
- $fore_color Draw the QR code Color
- tip: The color must be passed in hexadecimal color value, and replace "#" with "0x"; such as #FFFFFF => 0xFFFFFF
