How to download asset bundle using php?

I am downloading asset bundle using:-

 <?php
 $file_url = $_SERVER["DOCUMENT_ROOT"]."/AssetBundle/bundle-numb";
 
 header($_SERVER["SERVER_PROTOCOL"] . " 200 OK");
 header("Cache-Control: public");
 header("Content-Type: application/zip");
 header("Content-Transfer-Encoding: Binary");
  header("Content-Length:".filesize($file_url));
  header("Content-Disposition: attachment; filename=".basename($file_url));
  readfile($file_url);
 echo basename($file_url);
 echo filesize($file_url);
 ?>

Downloading working fine when i use http:XXXXXXXXXX.com/AssetBundle/bundle-numb directly in the browser.