How do I get all collider from a object?

Unity Engine
1

I have a gameobject attached a box collider,
how do I get all colliders to a array from the box collider?
for a example,
If I have a gameObject called “Character” and attached a mesh Collider.
how do I count how many collisions is happening?
or if I want to check is there any collider on it,
how do I code?
(sorry my expressing is not very well)

2

sorry, wrong place. (plz delete)