RestService::arrayChangeKeyCaseRecursive

static function arrayChangeKeyCaseRecursive(array $data, $case = CASE_UPPER)
{
	return array_map(static function ($item) use ($case) {
		if (is_array($item))
		{
			$item = self::arrayChangeKeyCaseRecursive($item, $case);
		}
		return $item;
	}, array_change_key_case($data, $case));
}