Description:
------------
If string indexed array is given to array_map it returns numerically indexed array after applying the callback.
I am using PHP 5.2.1 on Debian Linux.

Reproduce code:
---------------
<?php
$r = array('one' => 'HeLlO', 'two' => 'Hi');
print_r($r);//Orgiginal array
$r = array_map('tst_it', $r, array(false));
function tst_it($r, $bool = false){
	if($bool){return strtoupper($r);}
	else{return strtolower($r);}
}
print_r($r);//Array after array_map
?>

Expected result:
----------------
Array
(
    [one] => HeLlO
    [two] => Hi
)
Array
(
    [one] => hello
    [two] => hi
)

Actual result:
--------------
Array
(
    [one] => HeLlO
    [two] => Hi
)
Array
(
    [0] => hello
    [1] => hi
)