Question

如何将我的模型添加到控制器中以显示下拉值？我得到的错误：为foreach（）提供的参数无效我没有使用任何框架。只是本机的PHP。我是MVC和PHP的新手，请帮忙！

我的控制器：

<?php 
  class Index extends Controller {
    function __construct(){
      parent::__construct();
    }
    function index(){
      $landArray = $this->model->fetchData();
      $this->view->render('index/index');
      var_dump($landArray); // display all row in database
    }
}

型号：

<?php
class Index_Model extends Model {
 function __construct(){
    parent::__construct();
  }
 function fetchData(){
    $selectIsland = $this->connection->prepare("SELECT island_id, island 
                               from island" );
    $selectIsland->setFetchMode(PDO::FETCH_ASSOC);
    $selectIsland->execute();
    $islandResult = $selectIsland->fetchAll();
    return $islandResult;

 }
}

查看：

<select>
    <option value="">--- Select Island---</option>
      <?php
            foreach($islandResult as $row){
              echo '<option value="'.$row['island_id'].'">'.$row['island'].'</option>';
            endforeach
       }?>
</select>

这是我的库视图和渲染方法。

<?php
class View {
 function __construct(){
  }
public function render($name, $noInclude = false, $landArray){
 if($noInclude == true){
   require 'views/'.$name.'.php';
  }else{
  require 'views/header.php';
  require 'views/'.$name.'.php';
  require 'views/foother.php';
}
}
}
}

Answer 1

您从未调用模型的fetchData()方法。在MVC控制器控制一切。在您的控制器中，您必须从模型中调用方法。然后将它们传递给您的视图文件。

<?php 
  class Index extends Controller {
    function __construct(){
      parent::__construct();
    }
    function index(){
      $landArray = $this->model->fetchData();
      $this->view->render('index/index', false, array('islandResult' => $landArray)); // as we are sending param to view and render accept that as 3rd param so we need to specify the 2nd param too!
    }
} 
Model:

<?php
class Index_Model extends Model {
 function __construct(){
    parent::__construct();
  }
 function fetchData(){
    $selectIsland = $this->connection->prepare("SELECT island_id, island 
                               from island" );
    $selectIsland->execute();
    $islandResult = $selectIsland->fetchAll();
    return $islandResult;  //if you need something to pass to view from db first you have to pass it to controller from model
 }
}
View:

<select>
    <option value="">--- Select Island---</option>
      <?php
            foreach($islandResult as $row){
              echo '<option value="'.$row['island_id'].'">'.$row['island'].'</option>';
            }
       ?>
</select>

View/Render Library Method:

    class View {
         function __construct(){
         }
         public function render($name, $noInclude = false, $arrayParam = array()){ //look closely...here i've made 3rd parameter as default argument so that your other codes which don't need to send param to view works smoothly.
             if(count($arrayParam) > 0){
                 extract($arrayParam);
             }
             if($noInclude == true){
                 require 'views/'.$name.'.php';
             }else{
                 require 'views/header.php';
                 require 'views/'.$name.'.php';
                 require 'views/foother.php';
             }
         }
     }

现在，您将能够使用从控制器发送的视图中的参数。你在控制器中的数组键传递的任何内容都可以在视图中用作变量。

N.B：从代码中查看我的评论。

php mvc在数据库显示下拉列表中获取数据

1 个答案: