<?php $file = 'monkey.gif'; if (file_exists($file)) {     header('Content-Description: File Transfer');     header('Content-Type: application/octet-stream');     header('Content-Disposition: attachment; filename='.basename($file));     header('Content-Transfer-Encoding: binary');     header('Expires: 0');     header('Cache-Control: must-revalidate, post-check=0, pre-check=0');     header('Pragma: public');     header('Content-Length: ' . filesize($file));     ob_clean();     flush();     readfile($file);     exit; } ?> ? <?php header("Content-Type: application/force-download"); header("Content-Disposition: attachment; filename=ins.jpg");  readfile("imgs/test_Zoom.jpg"); ?>