How to get status of binary data transferred though php fwrite function using ajax

Hello everyone I am writing an application in which we are saving pdf data as binary data using ajax and php fwrite function my files are as follows:

**index.html**

$.ajax({
            url: './ajax_create_pdf.php',
            type: 'POST',
            dataType: 'JSON',
            data: {'base64data':data,
                   'original_file_url':inputFilePath,
            },
            
            
            success: function(response){
                
               
            
            }
            
            
        });//end of ajax function

**ajax_create_pdf.php**

<?php

$pdfData = $_POST['base64data'];

$original_file_url= $_POST['original_file_url'];

$docs_group_name="QR_DOCS";

// Decode the base64-encoded PDF data
$pdfBinaryData = base64_decode($pdfData);

// Define the path and filename for the PDF file

$pdfFilename = $original_file_url;

$pdfFilename2=str_replace(".pdf","_qr.pdf",$pdfFilename);

$pdfFilePath =  $pdfFilename2;

// Save the PDF file
$file = fopen($pdfFilePath, 'wb');
fwrite($file, $pdfBinaryData);
fclose($file);

//echo 'PDF file saved successfully.'


?>

Requirement is to notify the user which is at **index.html** file with the progress of data transferred at every 5 seconds time interval. So that user can be assured that their data fully transferred to the server.

plz help ...

source https://stackoverflow.com/questions/76148928/how-to-get-status-of-binary-data-transferred-though-php-fwrite-function-using-aj