如何处理PHP在不同浏览器下载中文文件名时出现的乱码问题？

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php

<?php $ua = $_SERVER["HTTP_USER_AGENT"]; $filename = "中文 文件名.txt"; $encoded_filename = urlencode($filename); $encoded_filename = str_replace("+", "%20", $encoded_filename); header('Content-Type: application/octet-stream'); if (preg_match("/MSIE/", $ua)) { header('Content-Disposition: attachment; filename="' . $encoded_filename . '"'); } else if (preg_match("/Firefox/", $ua)) { header('Content-Disposition: attachment; filename*="utf8\'\'' . $filename . '"'); } else { header('Content-Disposition: attachment; filename="' . $filename . '"'); } print 'ABC'; ?>