Description:
------------
When started using php 5 I tried to do something like this:
class A {
  private $var;
  function B($arg = $this->var) { ... }
}
Got 'unexpected T_VARIABLE' or course, but I think it would be a nice option to add in a future releases - default arguments computed when function is called. It could be especially useful when used inside classes.
Probably the same as bug #6566, but if it disappeared after php3, it certainly should be turned on again in php5

Expected result:
----------------
Compute default arguments when calling a function, that can create those itself. It will help if you need something like:
function A ($arg = NULL) {
   if($arg == NULL) $arg=$another_arg;
   .....
}