XF 1.3 How to ignore variable ($DOCUMENT_ROOT) in PHP callback?

[ix2013]

I have a PHP file in XenForo/Pages/<page> that has this line
include("$DOCUMENT_ROOT/include/config.php");

The code does what it's supposed to do but I get "Undefined variable: DOCUMENT_ROOT " in my server error logs. How can I have XenForo ignore it?

 

[ix2013]

If there isn't a way I can always use ../ but I'd just like to know.

 

[Chris D]

This is likely getting ignored because it has been posted in the styling forum

$DOCUMENT_ROOT is not a PHP variable that's available by default.

An undefined variable is simply that - undefined. It has not been explicitly defined and therefore it contains nothing. Undefined variables trigger a notice.

So you would either:

1) Define the variable first:

$DOCUMENT_ROOT = 'some/path';
include("$DOCUMENT_ROOT/include/config.php");

Or, 2) Use the $_SERVER super global which contains a DOCUMENT_ROOT index:

include("$_SERVER[DOCUMENT_ROOT]/include/config.php");

 

[ix2013]

Thank you. I knew I was missing something..