apache中对非站点索引的访问限制

$filename=$_GET["file"];

 

ob_end_clean();

header("Expires: 0");

if(!$file = @fopen($filename,'r')){

        echo 'read error';

        exit();

}

 

flock($file,LOCK_SH);

$filesize=filesize($filename);

 

Header("Content-type: application/octet-stream");

Header("Accept-Ranges: bytes");

Header("Accept-Length: ".$filesize);

Header("Content-Disposition: attachment; filename=" . $file_name);

if($filesize>0)

{

        echo fread($file,$filesize);

}

fclose($file);

ob_get_contents();

ob_end_clean();

exit;