Not 5.3.0 only, also reproducable on a
"PHP 5.2.6-1+lenny3 with Suhosin-Patch 0.9.6.2"

This is, sadly, expected. DirectoryIterator is a weird iterator, first of all, it implements SplFileInfo, and, instead of returning new instances of SplFileInfo on current(), it returns itself.

So, if you store each value in an array, they will all be the same DirectoryIterator object, pointing to beyond the last element. The only solution is to clone it while puting it in an array, but iterator_to_array doesn't clone (and shouldn't clone).

You can similarly reproduce it with:

$dit = new DirectoryIterator(dirname(__FILE__));
$arr = array();
foreach ($ait as $file) {
    $arr[] = $file;
}

foreach($arr as $file) {
    var_dump($file->getFileName());
}

Reproduced on Debian (Jessie) | PHP 5.5.7-2

Reproduced with PHP 5.5.9-1ubuntu4.11 (cli) (built: Jul  2 2015 15:23:08)

<?php

        $iterator = new directoryIterator('./');
        $array =  iterator_to_array( $iterator, false );
        rsort( $array );
        print_r( $array );
?>

Produces an array of DirectoryIterators
php arr.php 
Array
(
    [0] => DirectoryIterator Object
        (
            [pathName:SplFileInfo:private] => 
            [glob:DirectoryIterator:private] => 
            [subPathName:RecursiveDirectoryIterator:private] => 
        )

    [1] => DirectoryIterator Object
        (
            [pathName:SplFileInfo:private] => 
            [glob:DirectoryIterator:private] => 
            [subPathName:RecursiveDirectoryIterator:private] => 
        )