Description:
------------
when doing an array reverse with the "preserve keys" switch, just the 
values should be reversed. in fact it makes no difference if the 
preserve keys switch is true or not.

Reproduce code:
---------------
$array[0] = 3;
$array[1] = 1;
$array[2] = 2;

$firsNewArray=array_reverse($array);
$secondNewArray=array_reverse($array, true);


Expected result:
----------------
$firstNewArray
(
    [2] => 2
    [1] => 1
    [0] => 3
)

$secondNewArray
(
    [0] => 2
    [1] => 1
    [2] => 3
)

Actual result:
--------------
$firstNewArray
(
    [2] => 2
    [1] => 1
    [0] => 3
)

$secondNewArray
(
    [2] => 2
    [1] => 1
    [0] => 3
)