PHP 隐藏真实下载地址

<?
$file_name = "info_check.exe";
$file_dir = "/public/www/download/";

//检查文件是否存在
if(!file_exists($file_dir . $file_name)) exit('文件找不到');
else
{
$file = fopen($file_dir . $file_name,"r"); // 打开文件

// 输入文件标签
Header("Content-type: application/octet-stream");
Header("Accept-Ranges: bytes");
Header("Accept-Length: ".filesize($file_dir . $file_name));
Header("Content-Disposition: attachment; filename=" . $file_name);

// 输出文件内容
echo fread($file,filesize($file_dir . $file_name));
fclose($file);
exit;
}
?>

<?
$file_name = "info_check.exe";
$file_dir = "http://www.easycn.net/";
$file = @ fopen($file_dir . $file_name,"r");

if (!$file) exit('文件找不到');
else {
Header("Content-type: application/octet-stream");
Header("Content-Disposition: attachment; filename=" . $file_name);
while (!feof ($file)) {
echo fread($file,50000);
}
fclose ($file);
}
?>