<?php 

header("Content-Type: application/octet-stream"); 

$file = $_GET["file"] . ".pdf"; 

header("Content-Disposition: attachment; filename=" . urlencode($file)); 
header("Content-Type: application/download"); 
header("Content-Description: File Transfer");			 
header("Content-Length: " . filesize($file)); 

flush(); // This doesn't really matter. 

$fp = fopen($file, "r"); 
while (!feof($fp)) { 
	echo fread($fp, 65536); 
	flush(); // This is essential for large downloads 
} 

fclose($fp); 
?>