Don't half-pass by reference

PHP is pretty clever. If you omit the two `&` this doesn't necessarily mean the array is copied. If it's not touched and only read it will stay a reference and never be copied.

If you want to change the original array you need both `&`.

If you omit one `&` the array will be copied. Always. No matter if it's touched or not. Which is not what should happen with an unbounded monstrosity as the `$GLOBALS`.