Which one is correct: "As I said...." or "Like I said...." -?
In this case either version is correct, but it's not usual to use 'like' and 'as' interchangeably in other contexts, e.g.
You can do AS you like. (NOT like)
I bought her the skirt AS I promised. (NOT like)
AS you may know, I'm on holiday next week. (NOT like)
Note that it is in informal spoken English that you can notice 'like' and 'as' used interchangeably.