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<?php function key_sort_recursive(array &$array_to_sort): void { foreach ($array_to_sort as &$value) { if (is_array($value)) { key_sort_recursive($value); } } ksort($array_to_sort); } $array = ['cat' => ['dog' => "fred", "awk" => "michael"]]; key_sort_recursive($array); var_export($array);
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