PHP sur le téléchargement de fichiers chinois

$filename  = '中文.doc';
$filename = urlencode($filename);
echo $filename;
echo "<a href='download.php?filename=".$filename."'>下载</a>";

$filename = $_REQUEST['filename'];
<strong>$filename = iconv('utf-8', 'gb2312', $filename);</strong> // 这是最关键的一句，我原以为urlencode以后就不用转格式了。
header("Content-Type: application/octet-stream;");  
header('Content-Disposition:attachment;filename=' .$filename);    
readfile($filename);