1.I can't get a reference of object's member :
class t{
    var $var1;
    var $var2;
};
$a1 = new t;
$a1->var2='123';
$p1 = &($a1->var2);
//php report error

$p2 = &$a1->var2;
//$p2 get reference of $a1

2.variables are releaseed uncorrect.
class b{
    var $y;
};
class a{
    var $x;
    function getx(){
        $v = new b;
        $this->x=&$v;
    }
};

$n = new a;
$n->getx();

//$n->x seems not good.

1. Remove parentheses. $p1 = &($a1->var2) won't work, $p1 = &$a1->var2 would.

2. it seems to be OK. Does it still happen?