pp_cms/webApp/common/services/UserServiceInterface.php

<?php
/**
 * Author: lf
 * Blog: https://blog.feehi.com
 * Email: job@feehi.com
 * Created at: 2020-01-29 16:54
 */

namespace common\services;


interface UserServiceInterface extends ServiceInterface
{
    const ServiceName = "userService";

    public function getUserCountByPeriod($startAt=null, $endAt=null);
}