PHP Array Custom Sort

<?php

function cmp($a, $b) {
    $sortOrder = array(
        '3/0', '2/0', '1/0', '1', '2', '3'
    );

    $sortOrderPositionA = array_shift(array_keys($sortOrder, $a['name']));
    $sortOrderPositionB = array_shift(array_keys($sortOrder, $b['name']));

    if ($sortOrderPositionA == $sortOrderPositionB) {
        return 0;
    }
    return ($sortOrderPositionA < $sortOrderPositionB) ? -1 : 1;
}

$data = array(
    '2/0' => array(
        'name' => '2/0'
    ),
    '3/0' => array(
        'name' => '3/0'
    ),
    '1/0' => array(
        'name' => '1/0'
    ),
    '3' => array(
        'name' => '3'
    ),
    '2' => array(
        'name' => '2'
    ),
    '1' => array(
        'name' => '1'
    )
);

var_dump('original:', $data);

$dataSorted = uasort($data, 'cmp');

var_dump('sorted:', $data);

?>