Thinkphp and http Extension class. the download function cannot be downloaded. it only outputs the file content to the page.

Thinkphp, http Extension class, the download function cannot be downloaded. I only need to output the file content to the page and use it. the http Extension class wants to provide the function class & nbsp; indexAction & nbsp; extends & nbsp; Action & nbsp; {public & nbsp; functi thinkphp, http Extension class. the download function cannot be downloaded and only outputs the file content to the page.
I started to use the http Extension class to download one file.
Class IndexAction extends Action {

Public function download ()
{

$ File_dir = "D:/wamp/www/test/uploads /";
$ Name = 'aa.rar ';

$ Filename = $ file_dir. $ name;
If (! Empty ($ name )){
Import ("ORG. Net. Http ");
$ Download = new Http ();
$ Download-> download ($ filename, $ name );
}

}
}
The file is not downloaded as an attachment, but directly output the file content on the page.
Then, I don't need his extension class to write a php page and can download it normally.


$ File = 'd:/wamp/www/test/uploads/admin.rar ';
 
If (file_exists ($ file )){
Header ('content-Description: File Transfer ');
Header ('content-Type: application/octet-stream ');
Header ('content-Disposition: attachment; filename = '. basename ($ file ));
Header ('content-Transfer-Encoding: binary ');
Header ('expires: 0 ');
Header ('cache-Control: must-revalidate, post-check = 0, pre-check = 0 ');
Header ('pragma: public ');
Header ('content-Length: '. filesize ($ file ));
Ob_clean ();
Flush ();
Readfile ($ file );
Exit;
}
?>
It can be downloaded normally, but I paste this code into the download function, and the same result of the http class appears, that is, it is not downloaded as an attachment, instead, the file content is directly output to the page.
I cannot explain it. I beg for an explanation. why? I have used a great http class to teach me how to solve this problem for a long time.
------ Solution --------------------
Obviously, this page outputs other content before entering the Http header information. Probably the BOM of the UTF-8