<?php
/**
 * 广告业务类
 */
class Domain_Ad {

    public function __construct(){
        $this->model = new Model_Ad();
    }

    /**
     * 获取当前广告
     * @param  [type] is_open [description]
     * @return [type]        [description]
     */
    public function getAd(){
        return $this->model->get(array('is_open' => 1),array(), array('time_level' => -1), 1);
    }

}