How does CollisionFlags work?

Hi,

I've been trying to make a jump script for a while now, and I've seen the layer based collision detection that CharacterController uses. The thing is that I have my own scripts for moving my player, and would like to avoid attaching CharacterController to my GameObject. I would like to use the same method to detect collisions but I'm not really good with layers and the Unity scripting API is not very extensive sometimes.

Does someone know how I could make my own CollisionFlags?

Thank you!