using POST data for a readfile

["mel list_php" <list_php@xxxxxxxxxxxxx>]

Hi list,
(mail problem you may get that one twice!)

My problem: I protect my files by storing them out of the web root or behind 
a htaccess.
As I'm not using the htaccess authentication for my users, I use a readfile 
to serve the file, basically something like:

<a href='callFile.php?id=test.pdf'>File to serve</a>

and in the script callFile something like readfile(./protectedDir/test.pdf).
this works fine, but I just would like to use a post instead of a get, to 
avoid my users trying to modify the url.

I tried to use a function in the callFile script, something like:

function getFile ($fileId)   {

readfile($fileId);

}

if (isset($_POST['fileId']))
{
$fileId=$_POST['fileId'];
getFile($fileId);
}

but it doesn't work.
I also tried to do a require_once (callFile.php) and then later on call the 
getFile function from the first script but no more success.

Does anybody has any idea on how to do that?

Thanks,
Melanie

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