usort is returning array in reverse order

Question

This usort function is returning the array reverse from what I want. It's returning an array like ("1", "2", "3"). How can I make it return ("3", "2", "1")?

usort($myArray, function($a, $b) {
    return $a["comments"] - $b["comments"];
});

Answer 1

usort($myArray, function($a, $b) {
    return $b["comments"] - $a["comments"];
});

Just change A to B and B to A.