<?
phpinfo();
class a {
	
	function a ($obj) {
		$this->h = &$obj;
		return true;
	}
}

class b {
	var $d=1;
	var $item;
	
	function b () {
		$this->item = new a (&$this);
		$this->d++;
		echo $this->d.'//'.$this->item->h->d.'<br>';	}
	
	function c () {
		$this->item = new a (&$this);
	}
}

$b = new b ();
//$b->c (); //****
$b->d++;
echo $b->d.'--'.$b->item->h->d;


/*
Try to comment and recomment line ****
I see there is a bug with that sitution:
after finishing of object "b" constructor, link $a->h not linked to "b" object and $a->h is a copy of object "b".
I think, this is not right. In constructor $a->h is still link to "b", but after finishing the $a->h is a copy of "b".
*/