opkpm/app/common/enum/FreightEnum.php

<?php

namespace app\common\enum;

class FreightEnum
{
    //计费方式
    const CHARGE_WAY_WEIGHT = 1;//按重量计费
    const CHARGE_WAY_VOLUME = 2; //体积计费
    const CHARGE_WAY_PIECE = 3;//按件计费
}