problem with http header

[iovidiu]

i have on the site some files that can be downloaded by users. when the user click on the link to download the file coresponding to that link i use i send some headers to show the window doanload page. if user click save the file is downloaded correct. if user click open the file is not opened correct.
the problem is that i don't now what type of file is, and i don't now how to find it. how can i resolve this?

the script that i use to downoad a file is:

header("Content-type: application/octet-stream");
header("Content-Disposition: attachment; filename=".$file);
readfile($file);

i don't now what to send to Content-type header.
thanks

[edwardsbc]

There is a very long list of mime-types available. It will be up to you as the script programmer to pass the appropriate content-type to the client. I have attached a text file with the current "universal" types.

[iovidiu]

thanks.

i founded "mime_content_type " function that do what i need .. i think, but my php didn't recognize this function.
have u any idea?

[edwardsbc]

According to the manual, [man]mime_content_type()[/man] is only available in PHP versions of 4.3+. Additionally, in order to make the function work PHP needs to have been configured with (built/compiled with) --enable-mime-magic (or --with-mime-magic since PHP 4.3.2).

Finally, you need to set an PHP.INI setting to properly find the mime "magic" file.

This is the default in PHP.INI
mime_magic.magicfile = "/usr/share/misc/magic.mime"

I think you are on the right track for solving your problem.

[iovidiu]

thanks man