<?php
 /*
 * set here a limit of downloading rate (e.g. 10.20 Kb/s)
 */
 $download_rate = 10.20;
 $download_file = \'download-file.zip\'; 
 $target_file = \'target-file.zip\';
 if(file_exists($download_file)){
  /* headers */
  header(\'Last-Modified:\'.gmdate(\'D, d M Y H:i:s\').\'GMT\');
  header(\'Cache-control: private\');
  header(\'Content-Type: application/octet-stream\');
  header(\'Content-Length: \'.filesize($download_file));
  header(\'Content-Disposition: filename=\'.$target_file);
  /* flush content */
  flush();
  /* open file */
  $fh = @fopen($download_file, \'r\');
  while(!feof($fh)){
   /* send only current part of the file to browser */
   print fread($fh, round($download_rate * 1024));
   /* flush the content to the browser */
   flush();
   /* sleep for 1 sec */
   sleep(1);
  }
  /* close file */
  @fclose($fh);
 }else{
  die(\'Fatal error: the \'.$download_file.\' file does not exist!\');
 }
?>