Description:
------------
When I iterate through an array with "for" and create a reference to the current element inside the for, then the last element of the array will be a reference to the previous element.
If I unset the reference variable at the end of every cycle, then it works fine.

Reproduce code:
---------------
<?php
$list = array(
	array('id' => 1),
	array('id' => 2)
);
for($i = 0; $i < count($list); $i++) {
	$item = &$list[$i];
	$item['someValue'] = 'x';
}
foreach($list as $item)
{
	var_dump($item);
}

Expected result:
----------------
array(2) {
  ["id"]=>
  int(1)
  ["someValue"]=>
  string(1) "x"
}
array(2) {
  ["id"]=>
  int(2)
  ["someValue"]=>
  string(1) "x"
}


Actual result:
--------------
array(2) {
  ["id"]=>
  int(1)
  ["someValue"]=>
  string(1) "x"
}
array(2) {
  ["id"]=>
  int(1)
  ["someValue"]=>
  string(1) "x"
}

(Please note the second elements id, which is 1 instead of 2)