รบกวนขอตัวอย่าง download.php กับ open.php หน่อยสิครับ

if($filename!=NULL) {

header("Pragma: public");
header("Expires: 0"); // set expiration time
header("Cache-Control: must-revalidate, post-check=0, pre-check=0"); 

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

header("Content-Disposition: attachment; filename=".basename($filename).";");

header("Content-Transfer-Encoding: binary");
header("Content-Length: ".filesize($filename));

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