<?php
//set it to writable location, a place for temp generated PNG files
    $PNG_TEMP_DIR = dirname(__FILE__).DIRECTORY_SEPARATOR.'temp'.DIRECTORY_SEPARATOR;
    
    //html PNG location prefix
    $PNG_WEB_DIR = 'temp/';
 
    $string = '{
        "Office" : "stvat consultancy",
        "office Address": [
          "stvat consultant",
          "swarnabhoomi appartment",
          "ellis nagar Madurai",
          "625020"
        ],
        // "invoice": true,
        "inv no": "INV2123",
        "Client": "247",
        "Client Address" : [
            "247",
            "Hydrabath Branch",
            "India - 2020"
        ],
        "number": 123,
        "Product / Service Details": {
          "Name": "b",
          "Hsn / SAC": "d",
          "Qty" : "10",
          "Price" : "45665",
        },
        "other details":"testing",
        "string": "test Invoice"
      }';

   // $string = json_encode($string);

    include "qrlib.php";    
    
    //ofcourse we need rights to create temp dir
    if (!file_exists($PNG_TEMP_DIR))
        mkdir($PNG_TEMP_DIR);
    
    
    $filename = $PNG_TEMP_DIR.'test.png';
    
    //processing form input
    //remember to sanitize user input in real-life solution !!!
    $errorCorrectionLevel = 'L';
    if (isset($_REQUEST['level']) && in_array($_REQUEST['level'], array('L','M','Q','H')))
        $errorCorrectionLevel = $_REQUEST['level'];    

    $matrixPointSize = 4;
    if (isset($_REQUEST['size']))
        $matrixPointSize = min(max((int)$_REQUEST['size'], 1), 10);


    if (isset($_REQUEST['data'])) { 
    
        //it's very important!
        if (trim($_REQUEST['data']) == '')
            die('data cannot be empty! <a href="?">back</a>');
            
        // user data
        $filename = $PNG_TEMP_DIR.'test'.md5($_REQUEST['data'].'|'.$errorCorrectionLevel.'|'.$matrixPointSize).'.png';
        QRcode::png($string, $filename, $errorCorrectionLevel, $matrixPointSize, 2);    
        
    } else {    
    
        //default data
        echo 'You can provide data in GET parameter: <a href="?data=like_that">like that</a><hr/>';    
        QRcode::png('PHP QR Code :)', $filename, $errorCorrectionLevel, $matrixPointSize, 2);    
        
    }    
   

    //display generated file
    echo '<img src="'.$PNG_WEB_DIR.basename($filename).'" /><hr/>';  

    ?>