Description:
------------
When a reference to a variable (containing e.g. a literal or an object) is inserted into an array, all existing references in this array becomes references to this variable.


Reproduce code:
---------------
$t = NULL;

$node = '1';
// or $node = new Object();
$t[] = &$node;

$node = '2';
// or $node = new Object();
$t[] = &$node;

var_dump($t);


Expected result:
----------------
array(2) {
  [0]=>
  &string(1) "1"
  [1]=>
  &string(1) "2"
}

Actual result:
--------------
array(2) {
  [0]=>
  &string(1) "2"
  [1]=>
  &string(1) "2"
}