<?
class A {
  var $B;
  var $data;

  function A() {
    $this->data = "A before";
    $this->B = new B($this);
  }

  function set_data($value) {
    $this->data = $value;
  }

  function do_print() {
    print "{$this->data}\n";

  }

  function do_print_from_B() {
    $this->B->A->do_print();
  }
}

class B {
  var $A;
  var $data;
  function B(&$a_ref) {
    $this->data = "B before";
    $this->A = &$a_ref;
  }
}

$a = new A();
$a->set_data("A after");
$a->do_print();
$a->do_print_from_B();

?>

result is:

A after
A before

result *should* be:

A after
A after