screen/application/common/model/UserGroup.php

<?php

namespace app\common\model;

use think\Model;

class UserGroup extends Model
{

    // 表名
    protected $name = 'user_group';
    // 自动写入时间戳字段
    protected $autoWriteTimestamp = 'int';
    // 定义时间戳字段名
    protected $createTime = 'createtime';
    protected $updateTime = 'updatetime';
    // 追加属性
    protected $append = [
    ];
    const ADMIN=1;
    const USER=2;
    const SENDER=3;

    public static function getId($type){
        if($type==1){
            return self::USER;
        }
        return self::SENDER;
    }
}