Can't set argument default value to a global variable?

Question

Why can't I do that?

function ($var1, $var2 = $GLOBALS['var']){
  ...
}

the global 'var' is a object

Answer 1

You can't use variables as default values. You can use this:

function ($var1, $var2 = null){
  if(is_null($var2))
      $var2=$GLOBALS['var'];
  ...
}