<?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‘;?>原文：http://www.cnblogs.com/liuwenbohhh/p/4487081.html