include("/file.php") - document root

[legendx]

I may be losing my mind. I swear I've been able to use something like

include("/file.php"); 

And it would grab file.php located in the document root no matter where that line of code was in the directory structure. But for the life of me I can't find an environment that respects that.

I know there are a bizillion functions available on php.net for setting $_SERVER['document_root'] but I was hoping to avoid that by using the almighty single '/'.

Am I losing my mind?

[ayvegh]

Have you tried this?

include("./file.php"); 

[legendx]

Have you tried this?

include("./file.php"); 

That will include a file at the same level as the current file. I'm asking if I had file A 8 directories deep in a site, and I wanted to include file B at the root of the site.. how could I do it with just a '/' as it does in html/css/etc ?

[NogDog]

include $_SERVER['DOCUMENT_ROOT'] . '/file.php';