PHP uksort() Function

<?php
function my_sort($a, $b)
{
if ($a == $b) return 0;
return ($a > $b) ? -1 : 1;
}

$people = array("Swanson" => "Joe",
"Griffin" => "Peter", "Quagmire" => "Glenn",
"swanson" => "joe", "griffin" => "peter",
"quagmire" => "glenn");

uksort($people, "my_sort");

print_r ($people);
?>