Need some help with a php calc?

Hello

The following is code for a calculator, which I can't get it to display the combat level, and can't see why?

Ideally I would like someone to throw questions to while I finish the script and others beyond this small project. But any help would be great.

The formula for the code is simple, Defence + 2 + highest level out of Attack, Strength, Magic, Ranged, Summoning.

Anyway I can't get it to display any combat level below calculate. I am not sure why?

I have not started to work on the next part which will say how many levels of each skill (listed above) till next combat level gain.

Sorry about this double post no edit found?

Just need to display the combat levels and what levels are required to gain a level.

First problem I see is that combatLevelF2p() never actually returns anything.