Where should I put this file?

[eluser]whygod[/eluser]
@Pert
It's not a controller, It's just an ordinary PHP.
And below are the codes of it.

Code:

<?php
if (isset($_GET['uid'])) {
  
  // Fetch the upload progress data
  $status = uploadprogress_get_info($_GET['uid']);
  
  if ($status) {
  
   // Calculate the current percentage
   echo round($status['bytes_uploaded']/$status['bytes_total']*100);
  
  }
  else {
  
   // If there is no data, assume it's done
   echo 100;
  
  }
}
?>

So where should I put an ordinary PHP codes?