**Course Title:** Mastering Yii Framework: Building Scalable Web Applications **Section Title:** Authentication and Authorization **Topic:** Develop a user authentication system with login, registration, and role-based access control.(Lab topic) **Objective:** By the end of this topic, you will be able to develop a user authentication system with login, registration, and role-based access control using Yii framework. You will learn how to implement user authentication, authorization, and role-based access control in a real-world application. **Prerequisites:** Before starting this topic, you should have a good understanding of the following concepts: * Introduction to Yii and Development Environment * Routing, Controllers, and Views * Database Management with Active Record * Form Handling and Validation * Authentication and Authorization (previous topics) **Step 1: Setting up User Authentication** To develop a user authentication system, you need to set up the necessary components in Yii. You can use the following steps: 1. Create a new controller called `UserController` to handle user authentication. 2. Create a new model called `User` to represent the user data. 3. Configure the `User` model to use the `authManager` component for authentication. 4. Configure the `authManager` component to use the `db` component for database operations. **Example Code:** ```php // UserController.php namespace app\controllers; use Yii; use yii\web\Controller; use app\models\User; class UserController extends Controller { public function actionLogin() { // Login form } public function actionRegister() { // Registration form } public function actionLogout() { // Logout action } } // User.php namespace app\models; use yii\db\ActiveRecord; use yii\auth\authManager; class User extends ActiveRecord { public function rules() { return [ // Validation rules ]; } public function authenticate($username, $password) { // Authenticate user } } ``` **Step 2: Implementing User Registration** To implement user registration, you need to create a registration form and handle the form submission. You can use the following steps: 1. Create a new view called `register.php` to display the registration form. 2. Create a new action called `actionRegister` in the `UserController` to handle the form submission. 3. Use the `User` model to validate the user input and create a new user record. **Example Code:** ```php // register.php <?php use yii\helpers\Html; use yii\widgets\ActiveForm; $form = ActiveForm::begin([ 'id' => 'register-form', 'options' => ['enctype' => 'multipart/form-data'], ]); echo $form->field($model, 'username'); echo $form->field($model, 'email'); echo $form->field($model, 'password'); echo Html::submitButton('Register', ['class' => 'btn btn-primary']); ActiveForm::end(); ?> // UserController.php public function actionRegister() { $model = new User(); if ($model->load(Yii::$app->request->post()) && $model->save()) { // Registration successful } else { // Registration failed } } ``` **Step 3: Implementing User Login** To implement user login, you need to create a login form and handle the form submission. You can use the following steps: 1. Create a new view called `login.php` to display the login form. 2. Create a new action called `actionLogin` in the `UserController` to handle the form submission. 3. Use the `User` model to validate the user input and authenticate the user. **Example Code:** ```php // login.php <?php use yii\helpers\Html; use yii\widgets\ActiveForm; $form = ActiveForm::begin([ 'id' => 'login-form', ]); echo $form->field($model, 'username'); echo $form->field($model, 'password'); echo Html::submitButton('Login', ['class' => 'btn btn-primary']); ActiveForm::end(); ?> // UserController.php public function actionLogin() { $model = new User(); if ($model->load(Yii::$app->request->post()) && $model->authenticate()) { // Login successful } else { // Login failed } } ``` **Step 4: Implementing Role-Based Access Control** To implement role-based access control, you need to configure the `authManager` component to use the `rbac` component. You can use the following steps: 1. Create a new component called `rbac` to manage roles and permissions. 2. Configure the `authManager` component to use the `rbac` component. 3. Use the `rbac` component to assign roles and permissions to users. **Example Code:** ```php // rbac.php namespace app\components; use yii\rbac\ManagerInterface; class Rbac implements ManagerInterface { public function init() { // Initialize rbac component } public function assignRole($user, $role) { // Assign role to user } public function assignPermission($user, $permission) { // Assign permission to user } } // UserController.php public function actionAssignRole() { $user = User::findOne($id); $role = Role::findOne($roleId); $this->rbac->assignRole($user, $role); } public function actionAssignPermission() { $user = User::findOne($id); $permission = Permission::findOne($permissionId); $this->rbac->assignPermission($user, $permission); } ``` **Conclusion:** In this topic, you learned how to develop a user authentication system with login, registration, and role-based access control using Yii framework. You implemented user registration, login, and role-based access control using the `User` model, `authManager` component, and `rbac` component. You also learned how to assign roles and permissions to users using the `rbac` component. **Exercise:** Implement a user authentication system with login, registration, and role-based access control using Yii framework. Use the `User` model, `authManager` component, and `rbac` component to implement user registration, login, and role-based access control. **Note:** This topic is a lab topic, and you are expected to implement the user authentication system with login, registration, and role-based access control using Yii framework. You can use the example code provided in this topic as a reference. **External Resources:** * Yii Framework Documentation: <https://www.yiiframework.com/doc/> * Yii Framework Tutorials: <https://www.yiiframework.com/tutorials/> * Yii Framework Examples: <https://www.yiiframework.com/examples/> **Leave a comment or ask for help:** If you have any questions or need help with implementing the user authentication system with login, registration, and role-based access control using Yii framework, please leave a comment below.