header("Pragma: public");
		header("Expires: 0");
		header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
		header("Cache-Control: private",false);
header("Content-Type: application/vnd.ms-excel");
header("Content-Disposition: attachment; filename=table.csv");
header("Content-Transfer-Encoding: binary");
	
		flush(); 

		readfile("$cache_dir/$filename");
		exit;