How can I reference a variable in these two functions?

Question

https://code.sololearn.com/c8O3Ybi6R3JY/?ref=app

Answer 1

Use global variable to access variable in both function.

Answer 2

use global before the variable name

Answer 3

you will find it in the solo learn PHP course.

Answer 4

How do I make a global variable?

Answer 5

What is global?