<?php 

class X {
  var $i;

  function X($i) {
    $this->i = $i;
  }
}

class Y {
  var $A = array();
  var $B;

  function Y() {
    $this->A[1] = new X(1);
    $this->A[2] = new X(2);
    $this->B = $this->A[1];
  }
}

$before = new Y();
$ser = serialize($before);
$after = unserialize($ser);

var_dump($before, $after);

?>