What PHP modules/extensions required in SMF?

Image -> http://puu.sh/9DQdH.png

Hi,

I see many PHP 5.3 modules/extensions, but I don't know which are required in SMF.

So, what PHP modules/extensions required in SMF (fresh install) without any mods?

-> "Enabling additional modules that are not required could result in decreased performance."

-> Source: [click here]