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<?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);
Output for git.master_jit, git.master
Array ( [0] => Array ( [0] => 0 [1] => 2 [2] => 3 ) [1] => Array ( [0] => 1 [1] => 2 [2] => 3 ) [2] => Array ( [0] => 1 [1] => 2 [2] => 4 ) [3] => Array ( [0] => 1 [1] => 3 [2] => 5 ) ) Array ( [0] => Array ( [0] => 0 [1] => 2 [2] => 3 ) [1] => Array ( [0] => 1 [1] => 2 [2] => 3 ) [2] => Array ( [0] => 1 [1] => 2 [2] => 4 ) [3] => Array ( [0] => 1 [1] => 3 [2] => 5 ) ) Array ( [0] => Array ( [0] => 0 [1] => 2 [2] => 3 ) [1] => Array ( [0] => 1 [1] => 2 [2] => 3 ) [2] => Array ( [0] => 1 [1] => 2 [2] => 4 ) [3] => Array ( [0] => 1 [1] => 3 [2] => 5 ) )

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