Shoutbox

Hi all, working on a PHP file, I include a file, which has a link, let's say:

in a.php:

$a = '<a href="index.php">Index</a>';

and in all other files in the same directory:

include 'a.php';

But, when I have files in other folders I use:

include '../a.php';

but index.php is not in that folder and I get an error.


This was a simple explanation,  really need that file to be the only one with the link, so I can't just added in each page.
Is there any php function that detect in which folder the file is? In big, because that's the really question.

something like:

echo $_SERVER['DOCUMENT_ROOT'] 
// But DOCUMENT_ROOT will echo the complete path, and not just the folder.

The document root directory under which the current script is executing, as defined in the server's configuration file.