anchor.diff:      ephp_context:set_output(Context, <<"Array\n(\n", Data/binary, ")\n">>),
       true.
   
  --spec isset(Context :: context(), Value :: var_value()) -> boolean().
  +-spec isset(context(), var_value()) -> boolean().
   
   isset(_Context, {_,Value}) ->
       case Value of
  
positive.code:         _ -> true
      end.
  
  -spec empty(Context :: context(), Value :: var_value()) -> boolean().
  
  empty(_Context, {_,Value}) ->
      case Value of
  
negative.code:     ephp_context:set_output(Context, Result), 
      null.
  
  -spec print_r(context(), var_value(), Output :: boolean()) -> true | binary().
  
  print_r(_Context, {_,#reg_instance{class=Class, context=Ctx}}, {_,true}) ->
      Data = lists:foldl(fun(#class_attr{name=Name}, Output) ->
  