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(Advanced) Summary of how to generate QR code with logo in PHP
(Advanced) Summary of how to generate QR code with logo in PHP
1. Class libraries used
1. phpqrcode (php library)
2. qrcode.js (javascript library)
2. Use of phpqrcode
Only uses the PHP class library, that is, the generation of QR codes is operated in the background. Because you want to generate a QR code with a logo in the background, you must first upload the logo image to the server (I used webuploader here)
How to use phpqrcode:
First download phpqrcode: http://phpqrcode.sourceforge.net/
Then remember to introduce the phpqrcode.php file before using it
$value = $url;//二维码内容
$errorCorrectionLevel = 'L';//设置容错级别
$matrixPointSize = $size;//生成图片大小
QRcode::png($value, 'public_files'.DIRECTORY_SEPARATOR .'code'.DIRECTORY_SEPARATOR .'qrcode.png',
$errorCorrectionLevel, $matrixPointSize, 2);//生成二维码图片 无logo
$logo = $tar_path;//上传至服务器的logo图片
$QR = 'public_files'.DIRECTORY_SEPARATOR .'code'.DIRECTORY_SEPARATOR .'qrcode.png';//已经生成的原始二维码图
if ($logo !== FALSE) {
$QR = imagecreatefromstring(file_get_contents($QR));
$logo = imagecreatefromstring(file_get_contents($logo));
$QR_width = imagesx($QR);//二维码图片宽度
$QR_height = imagesy($QR);//二维码图片高度
$logo_width = imagesx($logo);//logo图片宽度
$logo_height = imagesy($logo);//logo图片高度
$logo_qr_width = $QR_width / 5;
$scale = $logo_width/$logo_qr_width;
$logo_qr_height = $logo_height/$scale;
$from_width = ($QR_width - $logo_qr_width) / 2;
imagecopyresampled($QR, $logo, $from_width, $from_width, 0, 0, $logo_qr_width,
$logo_qr_height, $logo_width, $logo_height);}$name = time();
imagepng($QR, 'public_files'.DIRECTORY_SEPARATOR .'code'.DIRECTORY_SEPARATOR .$name.'.png');//输出带logo的二维码图片3. Use of qrcode.js
Use qrcode.js To directly generate a QR code on the front end, you first need to download jquery.qrcode.js
The use of qrcode is also very simple:
var length = size*80;//设置二维码大小
length = parseInt(length);
$("#code_img").qrcode({ //code_img是一个img标签的id
render : "canvas", //设置渲染方式，有table和canvas，使用canvas方式渲染性能相对来说比较好
text : url, //扫描二维码后显示的内容,可以直接填一个网址，扫描二维码后自动跳向该链接
width : length, //二维码的宽度
height : length,
background : "#ffffff", //二维码的后景色
foreground : "#000000", //二维码的前景色
src: $('#image').attr('src') //二维码中间的图片});Introduce jquery.qrcode.js and then write this js code yourself , after execution, the QR code can be displayed and processed.
is mainly the logo reference format in the middle of the QR code. Generally, there are two formats for taking local pictures: one is the local URL, and the other is to convert the picture. Into base64 format
At first I tried the local URL format to reference images, but found that I could only reference images in the same directory as the js file, so the local URL format was not supported, so I adopted the latter method. .
Use
<input accept="image/*" type="file" id="file_input">
to upload and select local images, and then take their base64 format
var input = document.getElementById("file_input");
if(typeof FileReader==='undefined'){
input.setAttribute('disabled','disabled');}else{
input.addEventListener('change',readFile,false);}
function readFile(){ var file = this.files[0];
if(!/image\/\w+/.test(file.type)){
alert("文件必须为图片！");
return false; }
var reader = new FileReader();
reader.readAsDataURL(file);
reader.onload = function(e){
$('#image').attr('src',this.result);//image为img标签的id
}}Read the file as a string of Data URL strings, and convert the small file Read the page directly into the URL address in a special format. This special format is base64
3. Comparison between two class libraries
Two class libraries, one operates in the background and the other operates directly in the front end.
phpqrcode generates QR codes and operates in the background, and the generated images are saved on the server. Generally, the generated QR code is saved directly to the local and then used directly. It is rare to go to the server to obtain it for a second time. Therefore, using phpqrcode will cause the accumulation of images in the server, taking up unnecessary space, and deleting it will also cost extra money. overhead. So using phpqrcode is not suitable for this QR code generation tool. Moreover, uploading images will also generate extra overhead.
qrcode.js operates directly on the front end. The uploaded images are directly saved in the browser, and the QR code is generated directly on the front end without any background interference, which reduces unnecessary costs. The necessary overhead will not cause the accumulation of images on the server and occupy unnecessary space.
The above is the summary of the (advanced) PHP method of generating QR codes with logos. For more related content, please pay attention to the PHP Chinese website (www.php.cn)!
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