how detect user successfully finished downloading record php

i've got php page handles requets record downloads. i need means detect record downloaded successfully. done? maybe there's means detecting client-side following eventuality acknowledgment down server.

thanks.

edit:
by handle, i meant page doing something this:

$file = '/var/www/html/file-to-download.xyz';
  header('content-type: application/octet-stream');
  header('content-length: ' . filesize($file));
  header('content-disposition: attachment; filename=' . basename($file));
  readfile($file);