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;  
    }  
?>  

而如果文件路径是“http”或者“ftp” 网址的话，则源代码会有少许改变，程序如下：

<?  
    $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);
}
?>