thinkphp3.2 实现上移/下移功能

/**
 * 注意: 自增id, 开始默认和排序字段一致 [1: update `table` set sort = id],  [2: insert时需同步sort=id]
 * $id 当前移动的id
 * $action 操作 up=上移 down=下移
 * $table 操作的表名
 * $sortField 表中排序字段
 */
function MoveUpDown($id, $action, $table, $sortField = 'sort')
{

    if (empty($id) || empty($action) || empty($table)) {
        response(-1, '缺少必填参数');
    }

    $info = M($table)->where(['id' => $id])->find();

    switch ($action) {
        case 'up':
            $list = M($table)->where([$sortField => ['EGT', $info[$sortField]]])->order("$sortField asc")->limit(2)->select();
            break;
        case 'down':
            $list = M($table)->where([$sortField => ['ELT', $info[$sortField]]])->order("$sortField desc")->limit(2)->select();
            break;
        default:
            response(-1, '参数错误');
            break;
    }

    if (count($list) != 2) {
        response(-1, '操作错误, 无法移动');
    }

    $res  = M($table)->where(['id' => $list[0]['id']])->save([$sortField => $list[1][$sortField]]);
    $res2 = M($table)->where(['id' => $list[1]['id']])->save([$sortField => $list[0][$sortField]]);

    if ($res !== false && $res2 !== false) {
        response(0, 'success');
    }

}