**Course Title:** Mastering Yii Framework: Building Scalable Web Applications **Section Title:** Routing, Controllers, and Views **Topic:** Create routes, controllers, and views for a simple application using Yii's MVC structure.(Lab topic) **Objective:** By the end of this topic, you will be able to create routes, controllers, and views for a simple application using Yii's MVC structure. You will understand how to map URLs to controllers and actions, create controllers to handle user requests, and build views to display data to users. **Prerequisites:** * You have completed the previous topics in the Routing, Controllers, and Views section. * You have a basic understanding of the Yii framework and its ecosystem. * You have set up a Yii development environment. **Step 1: Create a Simple Application** Create a new Yii application using the Yii installer. For this example, we will create a simple blog application. ```bash composer create-project --prefer-dist yiisoft/yii2-app-basic blog ``` **Step 2: Create Routes** In the `config/web.php` file, add a new route to map the URL `/blog` to the `BlogController` controller. ```php 'components' => [ 'urlManager' => [ 'enablePrettyUrl' => true, 'showScriptName' => false, 'rules' => [ 'blog/<action>' => 'blog/<action>', ], ], ], ``` **Step 3: Create Controllers** Create a new controller file `BlogController.php` in the `app/controllers` directory. ```php namespace app\controllers; use yii\web\Controller; class BlogController extends Controller { public function actionIndex() { return $this->render('index'); } public function actionView($id) { return $this->render('view', ['id' => $id]); } } ``` **Step 4: Create Views** Create a new directory `views` in the `app` directory. Inside the `views` directory, create two new files `index.php` and `view.php`. `index.php`: ```php <?php use yii\helpers\Html; /* @var $this yii\web\View */ /* @var $model app\models\Blog */ $this->title = 'Blog'; $this->params['breadcrumbs'][] = $this->title; ?> <h1><?= Html::encode($this->title) ?></h1> <p> You may change the content of this page by modifying the file <code><?= __FILE__ ?></code>. </p> ``` `view.php`: ```php <?php use yii\helpers\Html; /* @var $this yii\web\View */ /* @var $model app\models\Blog */ $this->title = 'Blog Post'; $this->params['breadcrumbs'][] = ['label' => 'Blog', 'url' => ['index']]; $this->params['breadcrumbs'][] = $this->title; ?> <h1><?= Html::encode($this->title) ?></h1> <p> You may change the content of this page by modifying the file <code><?= __FILE__ ?></code>. </p> ``` **Step 5: Run the Application** Run the application using the following command: ```bash php yii serve ``` Open a web browser and navigate to `http://localhost:8080/blog`. You should see the index page of the blog application. **Conclusion:** In this topic, you learned how to create routes, controllers, and views for a simple application using Yii's MVC structure. You created a new Yii application, added a new route to map the URL `/blog` to the `BlogController` controller, created a new controller file `BlogController.php`, and built views to display data to users. **What's Next:** In the next topic, you will learn about Yii's database components and how to use them to interact with a database. **Leave a comment or ask for help:** If you have any questions or need help with this topic, please leave a comment below.