Borderlands DLC Question

I'm planning on picking up some of the Borderlands DLC. However, I have a friend who will not have any of it. Will we still be able to play together if we're doing things other than the DLC that he doesn't have, or will he have to host? I ask because I've come across a few games that didn't allow someone to jump into your game unless you had all of the same content.

if you have a ps3 just game share one of you can buy them and give them to the other.

you wont be able to go to any of the DLC areas no I think it just boots him back to the menus if you try to access those areas of the game