<?php
$files = glob('D:/archive_scanned_dox/*');     // get all file names in your drive D:/archive_scanned_dox
foreach($files as $file){    // iterate files
  if(is_file($file))
    unlink($file);    // delete file
}
echo "<script> window.close();</script>"; // Include this if you want to close the browser tab after delete
?>