一对多情况下 ，将多行查询结果合并为一行展示

$customer = M('customer')
            ->field('salesman_id')
            ->field("salesman_id,GROUP_CONCAT(concat_ws('#',id) separator',') AS group_combo")
            ->where(['salesman_id'=>$salesman_id])->order('salesman_id')->select();
        dump($customer);die;

引用地址
https://blog.csdn.net/weixin_44585369/article/details/122528778