PHP Serve File for Download

serve_download.php

<?php

function DownloadFile($file) {
  if (file_exists($file)) {
      header('Content-Description: File Transfer');
      header('Content-Type: application/octet-stream');
      header('Content-Disposition: attachment; filename='.basename($file));
      # header('Content-Transfer-Encoding: binary');
      header('Expires: 0');
      header('Cache-Control: must-revalidate');
      # OR- header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
      header('Pragma: public');
      header('Content-Length: ' . filesize($file));
      #ob_clean();
      #flush();
      readfile($file);
      exit;
  }
}

function DownloadFileWithSpeedLimit(){
  // set the download rate limit (=> 20,5 kb/s)
  $download_rate = 20.5;
  if(file_exists($local_file) && is_file($local_file))
  {
      header('Cache-control: private');
      header('Content-Type: application/octet-stream');
      header('Content-Length: '.filesize($local_file));
      header('Content-Disposition: filename='.$download_file);
  
      flush();
      $file = fopen($local_file, "r");
      while(!feof($file))
      {
          // send the current file part to the browser
          print fread($file, round($download_rate * 1024));
          // flush the content to the browser
          flush();
          // sleep one second
          sleep(1);
      }
      fclose($file);}
  else {
      die('Error: The file '.$local_file.' does not exist!');
  }
}


?>