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<?php $array = ['a' => ['a' => 1, 'b' => 2], 'b'=> ['a' => 0, 'b' => 1]]; usort($array, function($a, $b) { return $a['a'] <=> $b['a'] ?: $a['b'] <=> $b['b']; }); var_dump($array);
Output for git.master, git.master_jit, rfc.property-hooks
array(2) { [0]=> array(2) { ["a"]=> int(0) ["b"]=> int(1) } [1]=> array(2) { ["a"]=> int(1) ["b"]=> int(2) } }

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