I had an online interview last year, and it was basically me coding up as they supplied the criteria (in PHP). For the life of me, I couldn't remember how to us

I had an online interview last year, and it was basically me coding up as they supplied the criteria (in PHP). For the life of me, I couldn't remember how to use array_column, but I knew that was what I needed to use. They basically said "errr, you could just look it up?" - like, it was obvious that the interview was more about what you knew, and how to do things, rather than can you remember every little thing from ever about your job that you don't use day in day out.