Codeigniter REST API, difference between PUT and POST

Question

I am making an API for my site using Philip Sturgeon's REST server and i am in a little dilemma. I am not shure which action to use for edit and which for create. POST or PUT?

Answer 1

The POST method is usually used for create operations,
and the PUT is used for edit/update operations.

Answer 2

Put methods are Idempotent whereas Post methods are non-Idempotent. means put are safely repeatable and post are not safely repeatable