TP5混合查询 and or 联合查询写法

想要执行的SQL语句为

SELECT * FROM `aj_land` WHERE `land_no` = '0' AND ( `custom_name` LIKE '%4%' OR `custom_phone` LIKE
'%4%' ) AND `custom_id` = 0 LIMIT 1

tp5查询写法为

      $where['land_no'] = 0;
      if ($post['keyword']) {
            $where['custom_name|custom_phone'] = ['like', "%" . $post['keyword'] . '%'];
        }
        $where['custom_id'] = 0;
        $num = db('land')->where($where)->select();