pass globals to functions???

Some have eluded to this but I haven't seen a working example. I would like to declare globals in my main script and then inside functions that need these globals just somehow use the $GLOBALS or something to declare the variables global in the function. What I've seen eluded to is loading your $GLOBALS array into an array... In short, if I add a variable to my globals line in my main script, I don't want to have to go and add it to the functions that need it. Make sense??? TIA -Shawn