wow

Whats happens if height and window variables are negative?

it's a very good solution, but this approch have some issues:

what if we pass array that contain numbers less than 0 or greater than 10 !! the final result will has a logical error
so, if we will use this solution we must validate first incoming array and only use the sprintf method to build the phone number afer the validations done.

Nice one

Great solution👍

its good, but not best. You count sqrt(5) and phi every time, but can just use variables for it. Math is good, but you do pow 2 times, when can do just one.
You dont need to calc both numbers. Defenetly dont need to count $f0*$f1 every time. Count sqrt($prod) once and seek, is it between $f1 and $f2.
PS your formula is for finding Nth number of fibonacci, when you do math with every, not so effective.

Thank you!

Can someone explain to me whats the :string and the ... does?