php中强制下载文件的代码（解决了IE下中文文件名乱码问题）

中间遇到一个问题是提交的中文文件名直接放到header里在ie下会变成乱码，解决方法是将文件名先urlencode一下再放入header，如下。

<?php
$file_name = urlencode($_request['filename']);
header("pragma: public"); header("expires: 0");
header("cache-control: must-revalidate, post-check=0, pre-check=0");
header("content-type: application/force-download");
header('content-type: application/vnd.ms-excel; charset=utf-8');
header("content-transfer-encoding: binary");
header('content-disposition: attachment; filename='.$file_name);
echo stripslashes($_request['content']);
?>

解决php header下载文件在ie文件名中文乱码有两种常见的，一种是是把页面编码改成utf8，另一种是对中文url进入urlencode编码就可以解决了。
解决方案一(我的页面是utf-8编码)：

$filename = "中文.txt";
$ua = $_server["http_user_agent"];
$encoded_filename = urlencode($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 . '"');
}

解决方法二

将文件名先urlencode一下再放入header，如下。
代码如下:

<?php
$file_name = urlencode($_request['filename']);
header("pragma: public"); header("expires: 0");
header("cache-control: must-revalidate, post-check=0, pre-check=0");
header("content-type: application/force-download");
header('content-type: application/vnd.ms-excel; charset=utf-8');
header("content-transfer-encoding: binary");
header('content-disposition: attachment; filename='.$file_name);
echo stripslashes($_request['content']);
?>