PHP uses the ReadFile function to add permissions to the hidden download file address

1 <?php 以上代码实现了真是URL路径的隐藏功能, 本页开头可以进行权限判断。 2 效果如图，我们看到下面文件下载的URL已经被test.php隐藏.
$file = get_file_address ()//The real address of the file (URL is supported, but URL is not recommended)
03
if (file_exists ($file)) {
Header (' Content-description:file Transfer ');
Header (' Content-type:application/octet-stream ');
Modified 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;
17}
?>