php强制下载文件的代码(IE浏览器)

//header("Cache-Control: public");
header('content-type:application/vnd.ms-excel');
header("Content-Disposition:attachment; filename=report.xls");

如果不加第一句，会弹出 ： Internet Explorer 无法下载 **.php (来自**网站)。Internet Explorer无法打开该 internet 网站。请求的网站不可用，或找不到，请以后再试。

而且连名字都不是所设的名字:report.xls,而是 **.php，把第一句加上就可以了。

在看 rar,gif 之类的，不加第一句，居然通过，不弹出那个错误框框！

如果是 gif等图片的话 ，Content-Disposition:attachment; 会强制弹出一个保存对话框。如果省略或是 inline 就会直接在网页里显示。

Content-type 应取值，如下：

switch( $file_extension ) {
case "pdf": $ctype="application/pdf"; break;
case "exe": $ctype="application/octet-stream"; break;
case "zip": $ctype="application/zip"; break;
case "doc": $ctype="application/msword"; break;
case "xls": $ctype="application/vnd.ms-excel"; break;
case "ppt": $ctype="application/vnd.ms-powerpoint"; break;
case "gif": $ctype="image/gif"; break;
case "png": $ctype="image/png"; break;
case "jpeg":
case "jpg": $ctype="image/jpg"; break;
case "mp3": $ctype="audio/mpeg"; break;
case "wav": $ctype="audio/x-wav"; break;
case "mpeg":
case "mpg":
case "mpe": $ctype="video/mpeg"; break;
case "mov": $ctype="video/quicktime"; break;
case "avi": $ctype="video/x-msvideo"; break;
//The following are for extensions that shouldn't be downloaded (sensitive stuff, like php files)
case "php":
case "htm":
case "html":
case "txt": die("Cannot be used for ". $file_extension ." files!"); break;
default: $ctype="application/force-download";
}