Calculating the websites root directory

Hi there, PHP newbie here.

How do I define a global variable to point to the root of a web site so that I can navigate from anywhere to anywhere, without having to specify it (i.e. PHP works it out

For example:

<?php
global siteRoot = "the website's URL"
?>

PHP:

Where

 siteRoot 

Code (markup):

for example would pick up http://forums.digitalpoint.com it was running on this site.


I want to be able to write code like:

include_once $siteRoot."\includes\sub\sub\file.inc"

Code (markup):

for example.

Unless I'm missing can't see this in PHPINFO()

Is there an easy way ?

 

PHP has this...

include_once $_SERVER['DOCUMENT_ROOT']."\includes\sub\sub\file.inc"

PHP:

http://www.php.net/reserved.variables

 

Thanks man, I was looking for the hard way I think. Did not realise it would be THAT simple!!!

 

No problem. And global variables are generally frowned upon, so I would start right now coding without them.

-Peter