Description:
------------
An object having a field initialized to a element of an array   in the same object is transformed into a reference after unserializing. I had a session object exposing this problem and managed to create a code snippet exposing the problem. After the assignment to the field $y->B, the array should not have changed, but it is changed.
It looks like $y->B has become a reference to $y->A[1] after the unserialize call. This is a regression wrt to 4.3.9 and might be related to bug Bug #31213.

Reproduce code:
---------------
<?php 

class X {
  var $i;

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

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

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

$x = new Y();
$x->x();

echo "original object:\n";
print_r($x);

$ser = serialize($x);
$y = unserialize($ser);

echo "after unserialize:\n";
print_r($y);
$y->B = $y->A[2];
echo "after assignment:\n";
print_r($y);

?>

Expected result:
----------------
// result with 4.3.9
original object:
y Object
(
    [A] => Array
        (
            [1] => x Object
                (
                    [i] => 1
                )

            [2] => x Object
                (
                    [i] => 2
                )

        )

    [B] => x Object
        (
            [i] => 1
        )

)
after unserialize:
y Object
(
    [A] => Array
        (
            [1] => x Object
                (
                    [i] => 1
                )

            [2] => x Object
                (
                    [i] => 2
                )

        )

    [B] => x Object
        (
            [i] => 1
        )

)
after assignment:
y Object
(
    [A] => Array
        (
            [1] => x Object
                (
                    [i] => 1
                )

            [2] => x Object
                (
                    [i] => 2
                )

        )

    [B] => x Object
        (
            [i] => 2
        )

)

Actual result:
--------------
// result with 4.3.10
y Object
(
    [A] => Array
        (
            [1] => x Object
                (
                    [i] => 1
                )

            [2] => x Object
                (
                    [i] => 2
                )

        )

    [B] => x Object
        (
            [i] => 1
        )

)
after unserialize:
y Object
(
    [A] => Array
        (
            [1] => x Object
                (
                    [i] => 1
                )

            [2] => x Object
                (
                    [i] => 2
                )

        )

    [B] => x Object
        (
            [i] => 1
        )

)
after assignment:
y Object
(
    [A] => Array
        (
            [1] => x Object
                (
                    [i] => 2
                )

            [2] => x Object
                (
                    [i] => 2
                )

        )

    [B] => x Object
        (
            [i] => 2
        )

)