php隐藏实际地址的文件下载方法

function download_document($filename,$path="",$mimetype="application/octet-stream"){ header("Cache-Control: must-revalidate, post-check=0, pre-check=0"); header("Content-Disposition: attachment; filename = $filename"); header("Content-Length: " . filesize($pathto . $filename)); header("Content-Type: $mimetype"); echo file_get_contents($pathto . $filename);}

<?php$file = "1.txt";// 文件的真实地址（支持url,不过不建议用url）if (file_exists($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;}?>