Cakephp 蛋糕php中的多选列表框

我对cake php不熟悉。我必须在数据库中输入多个城市id，使用逗号分隔符，如10,11,12，其中10,11,12是城市id

当我使用这个代码时

 **<?php
          echo $form->input('city_id', array('options' => $city, 'class'=>'input_box2',
'empty' => 'Please select a city'), null, array('id' => 'city_id', 'label' => 'City'
          ));**

---

**您需要修改控制器中的POST数据：

在cakephp2.x中

$city_ids = Set::extract('/YourModel/city_id', $this->request->data);        
$this->request->data['YourModel']['city_id'] = implode(",", $city_ids); 

在cakephp1.x中

$city_ids = Set::extract('/YourModel/city_id', $this->data);        
$this->data['YourModel']['city_id'] = implode(",", $city_ids); 

$city_ids = Set::extract('/YourModel/city_id', $this->data);        
$this->data['YourModel']['city_id'] = implode(",", $city_ids);