如果要将查询结果导出到Excel，只需将页面的Context-Type修改一下就可以了：
header(
"Content-Type:
application/vnd.ms-excel">
如果希望能够提供那个打开/保存的对话框，Content-Disposition参数，Content-Disposition参数本来是为了在客户端另存文件时提供一个建议的文件名，但是考虑到安全的原因，就从规范中去掉了这个参数
Content-Disposition参数：
attachment
--- 作为附件下载
inline
--- 在线打开
具体使用如：header("Content-Disposition: inline;
filename=文件名.mp3");
Header("Content-Disposition：attachment;filename=test.xls");
其实IE是根据Content-Disposition中filename这个段中文件名的后缀来识别这个文件类型的，所以，
如果有很多种文件类型的时候，可以将Content-Type设置为二进制模式的：
Header("Content-type: application/octet-stream");
示例：
<?
$filename = ‘./download/d.rar
‘;
$filesize = filesize($filename);
header(
"Content-Type: application/force-download
");
header(
"Content-Disposition: attachment; filename=
".basename($filename));
header(
"Content-Length: ".$filesize);
$data = file_get_contents($filename);
echo $data;
?>
这段代码的意识是打开页面后立即出现下载保存窗口，下载的文件为$filename，
摘取了常用的部分，其实还有其他一些
$mimetypes
=
array(
‘doc‘ =>
‘application/msword‘,
‘bin‘ =>
‘application/octet-stream‘,
‘exe‘ =>
‘application/octet-stream‘,
‘so‘ =>
‘application/octet-stream‘,
‘dll‘ =>
‘application/octet-stream‘,
‘pdf‘ =>
‘application/pdf‘,
‘ai‘ =>
‘application/postscript‘,
‘xls‘ =>
‘application/vnd.ms-excel‘,
‘ppt‘ =>
‘application/vnd.ms-powerpoint‘,
‘dir‘ =>
‘application/x-director‘,
‘js‘ =>
‘application/x-javascript‘,
‘swf‘ =>
‘application/x-shockwave-flash‘,
‘xhtml‘ =>
‘application/xhtml+xml‘,
‘xht‘ =>
‘application/xhtml+xml‘,
‘zip‘ =>
‘application/zip‘,
‘mid‘ =>
‘audio/midi‘,
‘midi‘ =>
‘audio/midi‘,
‘mp3‘ =>
‘audio/mpeg‘,
‘rm‘ =>
‘audio/x-pn-realaudio‘,
‘rpm‘ =>
‘audio/x-pn-realaudio-plugin‘,
‘wav‘ =>
‘audio/x-wav‘,
‘bmp‘ =>
‘image/bmp‘,
‘gif‘ =>
‘image/gif‘,
‘jpeg‘ =>
‘image/jpeg‘,
‘jpg‘ =>
‘image/jpeg‘,
‘png‘ =>
‘image/png‘,
‘css‘ =>
‘text/css‘,
‘html‘ =>
‘text/html‘,
‘htm‘ =>
‘text/html‘,
‘txt‘ =>
‘text/plain‘,
‘xsl‘ =>
‘text/xml‘,
‘xml‘ =>
‘text/xml‘,
‘mpeg‘ =>
‘video/mpeg‘,
‘mpg‘ =>
‘video/mpeg‘,
‘avi‘ =>
‘video/x-msvideo‘,
‘movie‘ =>
‘video/x-sgi-movie‘,
);
Content-type 的说明,布布扣,bubuko.com
原文地址：http://www.cnblogs.com/wayne173/p/3746147.html
