gaoyixia/application/common/model/UserDownload.php

<?php
namespace app\common\model;
use think\Model;
// 会员下载
class UserDownload extends Model
{
    //
    public static function getDownLoadNum($first_id,$second_id,$type)
    {
        $where = [];
        if($first_id)  $where['first_id']=$first_id;
        if($second_id) $where['second_id']=$second_id;
        if($type) $where['type']=$type;
        return static::where($where)->count();
    }

}