php header pdf

1<?php
2header("Pragma: public");
3    header("Expires: 0");
4    header("Accept-Ranges: bytes");
5    header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
6    header("Content-Type: application/pdf");
7    header("Content-Disposition: attachment; filename=order.pdf");
8    header("Content-Transfer-Encoding: binary");