<?php
$file = "file.rar";
$speed = 50; // מהירות הורדה
if(file_exists($file) && is_file($file)) {
   header("Cache-control: private");
   header("Content-Type: application/octet-stream");
   header("Content-Length: ".filesize($file));
   header("Content-Disposition: filename=$file" . "%20");
   flush();
   $fd = fopen($file, "r");
   while(!feof($fd)) {
      echo fread($fd, round($speed*1024));
      flush();
      sleep(1);
   }
   fclose ($fd);
}