Allow func_get_arg(s) to pass by reference

Hi, I have failed the "state the goal and not the task" rule, sorry. So, my goal is to pass a variable number of arguments of which some could be references. I believed that this needs calltime by-ref calls but obviously need. For func_get_arg, a simple flag could suffice. For func_gets_args, I do not really know -- maybe a param to take all by ref, similar to EXTR_REFS. Thanks, Karoly Negyesi