我有一个表格,在Yii2中有一个名为“cITy”形式的多选字段.当我提交表格时
帖子数据显示以下内容：

$_POST['city'] = array('0'=>'City A','1'=>'City B','2'=>'City C')

但我想以序列化形式保存数组,如：

a:3:{i:0;s:6:"City A";i:1;s:6:"City B";i:2;s:6:"City C";}

但我不知道如何在Yii2中保存功能之前修改数据. Followin是我的代码：

if(Yii::$app->request->post()){

    $_POST['Adpackage']['Page'] = serialize($_POST['Adpackage']['Page']);  
    $_POST['Adpackage']['fixer_tyPE'] = serialize($_POST['Adpackage']['fixer_type']);  
}

 if ($model->load(Yii::$app->request->post()) && $model->save()) {

       return $this->redirect(['view','id' => $model->id]);
  } else {

      return $this->render('create',[
            'model' => $model   
        ]);
  }

请帮我.

谢谢你的努力.我已经解决了这个问题.这是代码：

public function beforeSave($insert)
    {
        if (parent::beforeSave($insert)) {
            $this->Page = serialize($_POST['Adpackage']['Page']);
            $this->fixer_type = serialize($_POST['Adpackage']['fixer_type']);
            return true;
        } else {
            return false;
        }
    }

只需将此代码放入模型及其工作中即可

$post = Yii::$app->request->post();
$post['Adpackage']['Page'] = serialize($post['Adpackage']['Page']);  
$post['Adpackage']['fixer_type'] = serialize($post['Adpackage']['fixer_type']); 
$model->load($post);