I really donot understand the syntax of (foreach function) can anyone explain it please ??

Answer 1

Check out this example with comments, hope it helps:

https://code.sololearn.com/w1Ctd27a55hI/?ref=app

Answer 2

A simple "thanks" for trying to help would have been nice. Your question was very general in nature, yet I gave a detailed response. Maybe someone else can help re 'keys' as I don't know enough about them.

PS. You still haven't said what you don't understand.

Answer 3

I mean second syntax which contains key