global variables in php not working as expected

Question

I\'m having trouble with global variables in php. I have a $screen var set in one file, which requires another file that calls an initSession() def

Answer 1

global $foo doesn't mean "make this variable global, so that everyone can use it". global $foo means "within the scope of this function, use the global variable $foo".

I am assuming from your example that each time, you are referring to $screen from within a function. If so you will need to use global $screen in each function.