Problem when downloading the generated Excel file

Question

PHP

For formation I use phpExcel. The file is generated and when downloaded from the server via ftp or via a direct link, the file is opened. And if you send it to the client via header(), then the file does not open. Writes "the actual format of the file being opened differs from the file name indicated by its extension." And the file thus has zero size.
Send code:

    header('Content-Type: application/vnd.ms-excel');
    header('Content-Disposition: attachment;filename="orders.xls"');
    header('Cache-Control: max-age=0');
    header("Content-Length: " . filesize($_SERVER['DOCUMENT_ROOT'].'/files/orders.xls'));

Answer 1

What always surprises me on Habré:
You go to the section created for questions . You create a question after trying to solve it yourself. You write and comment on everything.
All the same, the question is minus, and even they manage to slap a minus into karma ...

Answer 2

You forgot to display the contents of the file.
habrahabr.ru/post/151795/

Answer 3

Yes, I understand, blunted at first.
The result is the same - zero size and "the actual format of the file being opened differs from the specified one."
I set the rights to the file before uploading to 777.