Where is error? I want '6 Yes' as output.

Question

https://code.sololearn.com/w3Q1DgA3OOy2/?ref=app

Answer 1

"Notice: Undefined variable: answer...."

It looks like $answer is not a global variable. It's local to the function, created and destroyed there.

Putting a line break at line 5 between } and the function call may assist as a visual separation of 'variable scope'.

Answer 2

Check this

https://code.sololearn.com/w3zoxw3Ll9Al

Answer 3

global $answer; <-- put this in your func

Answer 4

Try this
Function with global variable in php

https://code.sololearn.com/w3zoxw3Ll9Al/#php