Right, what I'm trying to do is the following: add a value ('site_url')to an array($validfields) without modifying the original code.

At first I tried this, and it works fine:

However, it's not what I want. I then tried this:

but that gives me a parse error:
I then tried this:
which again errors me out:
Anyone know what I'm doing wrong?

You would need to use:

Also, you made some spelling mistakes.. site_url and siteurl and sireurl are alot of diffrent things ;)

Alright thanks, I'll try that .

Yeah the spelling mistakes were just because I was typing quickly.. I couldn't be arsed with looking for the different pieces of code in my backup files and copy pasting it all ^^.