คำสั่งดาวน์โหลดไฟล์ แต่มันไม่ขึ้นขนาดไฟล์ header Content-Length

<?php
$filename = $_GET['file'];

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-Description: File Transfer");

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

@readfile($filename);
exit(0);
?>