Globals vs Pass by reference

[spelltwister]

Hey all,

Is there any advantage to using pass by reference over global declaration in the function?

Here's what I have:

$myArray;

function alterMyArray(){
  global $myArray;
  //do something to my array
}

function alterMyArray(&$myArray){
  //do something to my array
}

alterMyArray($myArray);

The function will only ever have the $myArray variable passed in so, is there any reason to use pass by reference?

Lastly, does the & go in the function signature or in the function call (IE function A(&$byRef){} OR A(&$byRef);)

Thanks a bunch!

Mike