当多人使用它时，我的项目目录中是否会生成QR代码会混淆吗？

Question

I have a question about the application generate QR code image.

I have an application when clients click a button there will generate a QR code image, my way is store in the project library, then print <img> with the url to the screen. then clients can see it.

But I have a doubt, if there are multi clients using the QR code at the same time, whether there will get a mix?

my code is bellow:

function generate_qrcode($url){

    $filename = 'hante_qrcode.png';
    $errorCorrectionLevel = 'L';
    $matrixPointSize = 4;
    //generate QR code image
    $o = QRcode::png($url, $filename, $errorCorrectionLevel, $matrixPointSize, 2);

    echo "<pre>";
    print_r($o);

    print_r('<img src="hante_qrcode.png">');

}

---

if there get mix, how to solve this problem?

Answer 1

But I have a doubt, if there are multi clients using the QR code at the same time, whether there will get a mix?

yes

how to solve this problem?

there are two ways to solve this problem

1. you can provide unique name for every files like using timestamp using time() function or with user ID. cause as per you are passing parameters while generating qr code you need to store the file. without saving file also possible but in that case you can't configure pixel size and frame size. you can refer this for PHP QR code-Examples
2. don't store image on server and find some js to generate qr code directly from client side.
   • having a one demo for that check if you can use it

var qrcode = new QRCode("qrcode");
qrcode.makeCode('https://stackoverflow.com');

<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdn.rawgit.com/davidshimjs/qrcodejs/gh-pages/qrcode.min.js"></script>
<div id="qrcode"></div>

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