驼峰对象转下划线数组和下划线数组转驼峰对象

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    /***
     * @param $fields 驼峰对象
     * @return array
     */
    public static function CamelToUnderLineArr($fields)
    {
        $newArr = [];
        if (!is_object($fields) || !get_object_vars($fields))  return $newArr;

        foreach ($fields as $key => $v) {
            $keyTmp = strtolower(preg_replace('/((?$key);
        }

        return $newArr;
    }