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<?php $a = [ 'foo' => [2, 1], 'bar' => [4,3], 'cow' => [1], ]; array_walk($a, function(&$array) {sort($array);}); var_dump($a);
Output for rfc.property-hooks, git.master, git.master_jit
array(3) { ["foo"]=> array(2) { [0]=> int(1) [1]=> int(2) } ["bar"]=> array(2) { [0]=> int(3) [1]=> int(4) } ["cow"]=> array(1) { [0]=> int(1) } }

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