在IE中下载附件之前要清空缓存、中文文件名要用urlencode编码，下面有个不错的示例，需要的朋友可以参考下

重点：

1、在IE中下载附件之前要清空缓存。

2、中文文件名要用urlencode编码。

 
Header("Pragma: "); //不加的话，IE中会提示目标主机无法访问 
Header("Cache-Control: "); //不加的话，IE中会提示目标主机无法访问 
Header("content-type: $type"); 
Header("accept-ranges: bytes"); 
Header("Content-Transfer-Encoding:base64"); 
Header("accept-length: " . filesize($path_c)); 
Header("content-disposition: attachment; filename=" .urlencode($filename)); //IE中不用urlencode中文名会出现乱码 
readfile($path_c); 
exit; 

或

 
header('Content-Description: File Transfer'); 
header('Content-Type: application/octet-stream'); 
header('Content-Disposition: attachment; filename='.urlencode(basename($file) )); //IE中不用urlencode中文名会出现乱码 
header('Content-Transfer-Encoding: binary'); //二进制传输 
header('Expires: 0'); 
header('Cache-Control: must-revalidate, post-check=0, pre-check=0'); //不加的话，IE中会提示目标主机无法访问 
header('Pragma: public'); //不加的话，IE中会提示目标主机无法访问 
header('Content-Length: ' . filesize($file)); 
ob_clean(); 
flush(); 
readfile($file); 
exit;