Online PHP editor | refs for bZ2W3

<?php $array = [ [1, 2, 3], [1, 3, 5], [1, 2, 4], [0, 2, 3], ]; function one($a, $b) { return $a[0] <=> $b[0] ?: $a[1] <=> $b[1] ?: $a[2] <=> $b[2] ?: 0; } function two($a, $b) { return [$a[0], $a[1], $a[2]] <=> [$b[0], $b[1], $b[2]]; } function three($a, $b) { return $a <=> $b; } usort($array, one(...)); print_r($array); usort($array, two(...)); print_r($array); usort($array, three(...)); print_r($array);