Datauristring pdf open in php

$("#printer").on("click",function(e){

var element = document.getElementById('qrcode');

var opt = {

  image:        { type: 'jpeg', quality: 0.98 },
  html2canvas:  { scale: 3 },
  jsPDF:        { unit: 'cm', format: 'letter', orientation: 'landscape' }
};

html2pdf().from(element).set(opt).toPdf().output('datauristring').then(function (pdfAsString) {
    // The PDF has been converted to a Data URI string and passed to this function.
    // Use pdfAsString however you like (send as email, etc)!

var arr = pdfAsString.split(',');
pdfAsString= arr[1];    

        var data = new FormData();
        data.append("data" , pdfAsString);
        var xhr = new XMLHttpRequest();
        xhr.open( 'post', 'upload.php', true ); //Post the Data URI to php Script to save to server
        xhr.send(data);

        })

e.preventDefault();  //stop the browser from following
    window.location.href = 'uploads/file.pdf';

});

Source: stackoverflow.com

Datauristring pdf open in php

<?php
$data = $_POST['data'];
$b64 = $data;

# Decode the Base64 string, making sure that it contains only valid characters
$bin = base64_decode($b64, true);

# Perform a basic validation to make sure that the result is a valid PDF file
# Be aware! The magic number (file signature) is not 100% reliable solution to validate PDF files
# Moreover, if you get Base64 from an untrusted source, you must sanitize the PDF contents
if (strpos($bin, '%PDF') !== 0) {
  throw new Exception('Missing the PDF file signature');
}

# Write the PDF contents to a local file
file_put_contents('uploads/file.pdf', $bin);
?>

Source: stackoverflow.com

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