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']); 
?>