<?

class ClassA {
 
}

class ClassB {
  var $RefA = null;

  function ClassB() {

  }

  function InitRefA() {
    $this->RefA = new ClassA();
  }

  function CheckRefA() {
    print "RefA=".$this->RefA."<br>";
  }
 
}

class ClassC extends ClassB {
  var $RefAA = null;
  var $RefB = null;

  function ClassC() {
    ClassB::ClassB();
    $this->RefAA = $this->RefA;
  }


  function CheckRefAA() {
    print "RefAA=".$this->RefAA."<br>";
  }
 
}

$test = new ClassC();
$test->InitRefA();
$test->CheckRefA();
$test->CheckRefAA();

?>

RefA=Object
RefAA=