複数の if 条件を組み合わせる方法

複数の if 条件を組み合わせる方法
タイトルの通り: コードが効率的ではない、冗長性が高すぎる、オンラインであるなど。

PHP コード

<!--

Code highlighting produced by Actipro CodeHighlighter (freeware)
http://www.CodeHighlighter.com/

-->
if($start_id == $first_id && $arrive_id == '') {
                    echo "我是第一个城市城市";
                    //去查询第一个城市是否添加了交通工具
                    $start_id = '';
                    $arrive_id = $first_id;
                    $res = $this->model->get_traffic($tripid, $type, $start_id, $arrive_id);
                    if($res) {
                        $affected_rows = $this->model->update_traffic($traffic, $tripid, $type, $start_id, $arrive_id);
                        if($affected_rows > 0) {
                            echo "更新成功！";
                        }
                    }else{
                        $trafficid = $this->model->add_traffic($traffic, $tripid, $start_id, $arrive_id, $type, $dateline);
                        if($trafficid > 0) {
                            echo '添加成功';
                        }
                    }
                    exit;
                }

                if($start_id == $last_id && $arrive_id == '') {
                    echo "我是最后一个城市";
                    $start_id = $last_id;
                    $arrive_id = '';
                    $res = $this->model->get_traffic($tripid, $type, $start_id, $arrive_id);
                    
                    if($res) {
                        $affected_rows = $this->model->update_traffic($traffic, $tripid, $type, $start_id, $arrive_id);
                        if($affected_rows > 0) {
                            echo "更新成功！";
                        }
                    }else{
                        $trafficid = $this->model->add_traffic($traffic, $tripid, $start_id, $arrive_id, $type, $dateline);
                        if($trafficid > 0) {
                            echo '添加成功';
                        }
                    }

                    exit;
                }

                if($start_id == '' && $arrive_id == '') {
                    echo "需选择2个城市才能添加交通工具";
                }else{
                    echo "选择正确可以入库";
                    $res = $this->model->get_traffic($tripid, $type, $start_id, $arrive_id);
                    
                    if($res) {
                        $affected_rows = $this->model->update_traffic($traffic, $tripid, $type, $start_id, $arrive_id);
                        if($affected_rows > 0) {
                            echo "更新成功！";
                        }
                    }else{
                        $trafficid = $this->model->add_traffic($traffic, $tripid, $start_id, $arrive_id, $type, $dateline);
                        if($trafficid > 0) {
                            echo '添加成功';
                        }
                    }
                }
            }
            $this->display = true;
            $this->view->assign('cities', $cities);
            $this->view->assign('traffic', $_config['traffic']);

            $this->view->assign('tripid', $tripid);
            $this->view->assign('cityid', $cityid);
            $this->view->assign('type', $type);
        }else if($type == 2) {
            echo "我是来添加景点美食绿色的";
        }

-----解決策---------
if else {} 括弧は一致しますか?何かがおかしいと感じるのはなぜですか? 。 。
-----解決策---------
スイッチで試してみよう！
------解決策------------------
$res = $this->model- > ;get_traffic($tripid, $type, $start_id, $arrive_id);
if($res) {
$affected_rows = $this->model->update_traffic($traffic, $tripid, $ type , $start_id, $arrive_id);
if($affected_rows > 0) {
echo "更新成功!";