<?php
class A
{
  var $B = false;
  var $x = '';
  funtion A ($A = '')
  {
     if (! empty($A)) $this->A = &$A;
  }

  function lies_B ()
  {
     return ($B) ? $this->B->get_var() : false;
  }
}

class B
{
  var $x = 123456;
  function get_var()
  {
     return $this->x;
  }
}

$instanz_b = & new B;
$instanz_a = & new A (&$instanz_b);

echo $instanz_a->lies_B;
?>