a total php newbie wont have any idea on how hard it is to build a Forum. I made one. Its taken my 1month so far. I put it on the web. And found many errors i couldnt get to before.
There are way to many things to look after in a Forum. You have the forums themselves. Then people registered. I showed people online, and stuff. Then you need sessions and cookies, giving people the choice.
You wanna have BBcode. You must make it up.
Theres alot lot more. But the thing is its very very time consuming. You should know alot in PHP before you try and attempt it. I tried not using OO and i found its extremely hard. Im not giving up though. But im sure gonna learn more OO and update the code.