To Global Variables inside functions?

Not sure if I understand what you want, but your $var is not global. Its a local variable inside main().

You do not assing a value to the global scope variable $var. Only main() assigns a value to a variable called $var but only in main()'s scope. And only main()'s echo $var; actually prints the value.

Both calls to sub() do not produce output. Try it with.

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