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Yii2 Authentication & Authorization: RBAC & AccessControl

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Yii2 Authentication & Authorization: RBAC & AccessControl

Phase 3 gave you a task manager backed by a real database. Anyone can create, edit, and delete any task. That's a problem. In production, you need to answer two questions for every request:

  1. Authentication — Who are you? (login, session, identity)
  2. Authorization — What are you allowed to do? (roles, permissions, rules)

Yii2 has a complete built-in system for both. You don't need third-party packages or manual session wrangling. The framework gives you an IdentityInterface for authentication, AccessControl for simple permission gates, and a full RBAC (Role-Based Access Control) component with database storage for complex permission hierarchies.

By the end of this post, your task manager will have user registration, login/logout, controller-level access rules, and a complete RBAC system where admins can manage all tasks while regular users can only manage their own.

What You'll Build

✅ User registration with password hashing
✅ Login/logout with session-based authentication
AccessControl behavior to protect controller actions
✅ Database-backed RBAC with roles and permissions
✅ Custom RBAC rules for "own resource" checks
✅ Admin vs regular user permission hierarchy


1. The User Component

Every Yii2 app has a user application component that manages authentication state. It's configured in config/web.php:

// config/web.php
'components' => [
    'user' => [
        'identityClass' => 'app\models\User',
        'enableAutoLogin' => true,
        'loginUrl' => ['site/login'],
    ],
],
PropertyPurpose
identityClassThe model class that implements IdentityInterface
enableAutoLoginRemember-me cookie support
loginUrlWhere to redirect unauthenticated users

The user component is available everywhere via Yii::$app->user. Key methods:

Yii::$app->user->isGuest;      // true if not logged in
Yii::$app->user->id;            // current user's ID
Yii::$app->user->identity;      // current User model instance
Yii::$app->user->login($user);  // start session
Yii::$app->user->logout();      // destroy session

2. The IdentityInterface

Your User model must implement yii\web\IdentityInterface. This interface has five methods that Yii2 calls during authentication:

// models/User.php
namespace app\models;
 
use yii\db\ActiveRecord;
use yii\web\IdentityInterface;
 
class User extends ActiveRecord implements IdentityInterface
{
    public static function tableName(): string
    {
        return 'users';
    }
 
    // --- IdentityInterface methods ---
 
    /**
     * Find user by primary key (used by session to reload identity)
     */
    public static function findIdentity($id): ?self
    {
        return static::findOne($id);
    }
 
    /**
     * Find user by access token (used for stateless/API auth)
     */
    public static function findIdentityByAccessToken($token, $type = null): ?self
    {
        return static::findOne(['access_token' => $token]);
    }
 
    /**
     * Return the primary key value
     */
    public function getId(): int
    {
        return $this->id;
    }
 
    /**
     * Return a key for cookie-based login validation
     */
    public function getAuthKey(): string
    {
        return $this->auth_key;
    }
 
    /**
     * Validate the auth key (compare stored vs provided)
     */
    public function validateAuthKey($authKey): bool
    {
        return $this->auth_key === $authKey;
    }
}

The Users Migration

Create a migration for the users table if you don't already have one:

php yii migrate/create create_users_table
public function safeUp(): void
{
    $this->createTable('users', [
        'id'          => $this->primaryKey(),
        'username'    => $this->string(50)->notNull()->unique(),
        'email'       => $this->string(255)->notNull()->unique(),
        'password_hash' => $this->string(255)->notNull(),
        'auth_key'    => $this->string(32)->notNull(),
        'access_token' => $this->string(255)->unique(),
        'status'      => $this->smallInteger()->notNull()->defaultValue(10),
        'created_at'  => $this->dateTime()->notNull(),
        'updated_at'  => $this->dateTime()->notNull(),
    ]);
}

Run it:

php yii migrate

3. Password Hashing

Never store passwords in plain text. Yii2 wraps PHP's password_hash() and password_verify() in a security helper:

use Yii;
 
class User extends ActiveRecord implements IdentityInterface
{
    // ... IdentityInterface methods from above ...
 
    /**
     * Hash and store the password
     */
    public function setPassword(string $password): void
    {
        $this->password_hash = Yii::$app->security->generatePasswordHash($password);
    }
 
    /**
     * Verify a password against the stored hash
     */
    public function validatePassword(string $password): bool
    {
        return Yii::$app->security->validatePassword($password, $this->password_hash);
    }
 
    /**
     * Generate a random auth key for cookie-based login
     */
    public function generateAuthKey(): void
    {
        $this->auth_key = Yii::$app->security->generateRandomString();
    }
}

generatePasswordHash() uses bcrypt by default with a cost factor of 13 — strong enough for most applications. You can adjust the cost:

Yii::$app->security->generatePasswordHash($password, 12); // cost = 12

4. Signup

Create a form model for registration:

// models/SignupForm.php
namespace app\models;
 
use yii\base\Model;
 
class SignupForm extends Model
{
    public string $username = '';
    public string $email = '';
    public string $password = '';
 
    public function rules(): array
    {
        return [
            ['username', 'required'],
            ['username', 'string', 'min' => 3, 'max' => 50],
            ['username', 'unique', 'targetClass' => User::class],
 
            ['email', 'required'],
            ['email', 'email'],
            ['email', 'unique', 'targetClass' => User::class],
 
            ['password', 'required'],
            ['password', 'string', 'min' => 8],
        ];
    }
 
    public function signup(): ?User
    {
        if (!$this->validate()) {
            return null;
        }
 
        $user = new User();
        $user->username = $this->username;
        $user->email = $this->email;
        $user->setPassword($this->password);
        $user->generateAuthKey();
        $user->created_at = date('Y-m-d H:i:s');
        $user->updated_at = date('Y-m-d H:i:s');
 
        return $user->save() ? $user : null;
    }
}

Signup Controller Action

// controllers/SiteController.php
public function actionSignup(): string|\yii\web\Response
{
    $model = new SignupForm();
 
    if ($model->load(Yii::$app->request->post()) && $model->signup()) {
        Yii::$app->session->setFlash('success', 'Account created. Please log in.');
        return $this->redirect(['site/login']);
    }
 
    return $this->render('signup', ['model' => $model]);
}

Signup View

<!-- views/site/signup.php -->
<?php
use yii\helpers\Html;
use yii\widgets\ActiveForm;
 
$this->title = 'Sign Up';
?>
 
<h1><?= Html::encode($this->title) ?></h1>
 
<?php $form = ActiveForm::begin(); ?>
 
<?= $form->field($model, 'username')->textInput(['autofocus' => true]) ?>
<?= $form->field($model, 'email') ?>
<?= $form->field($model, 'password')->passwordInput() ?>
 
<div class="form-group">
    <?= Html::submitButton('Sign Up', ['class' => 'btn btn-primary']) ?>
</div>
 
<?php ActiveForm::end(); ?>

5. Login

Create a login form model:

// models/LoginForm.php
namespace app\models;
 
use Yii;
use yii\base\Model;
 
class LoginForm extends Model
{
    public string $username = '';
    public string $password = '';
    public bool $rememberMe = true;
 
    private ?User $_user = null;
 
    public function rules(): array
    {
        return [
            [['username', 'password'], 'required'],
            ['rememberMe', 'boolean'],
            ['password', 'validatePassword'],
        ];
    }
 
    /**
     * Custom validator — checks password against database
     */
    public function validatePassword(string $attribute): void
    {
        if (!$this->hasErrors()) {
            $user = $this->getUser();
            if (!$user || !$user->validatePassword($this->password)) {
                $this->addError($attribute, 'Incorrect username or password.');
            }
        }
    }
 
    public function login(): bool
    {
        if ($this->validate()) {
            return Yii::$app->user->login(
                $this->getUser(),
                $this->rememberMe ? 3600 * 24 * 30 : 0  // 30 days
            );
        }
        return false;
    }
 
    protected function getUser(): ?User
    {
        if ($this->_user === null) {
            $this->_user = User::findOne(['username' => $this->username]);
        }
        return $this->_user;
    }
}

Login Controller Action

public function actionLogin(): string|\yii\web\Response
{
    if (!Yii::$app->user->isGuest) {
        return $this->goHome();
    }
 
    $model = new LoginForm();
 
    if ($model->load(Yii::$app->request->post()) && $model->login()) {
        return $this->goBack(); // redirect to page they were trying to access
    }
 
    return $this->render('login', ['model' => $model]);
}
 
public function actionLogout(): \yii\web\Response
{
    Yii::$app->user->logout();
    return $this->goHome();
}

Login View

<!-- views/site/login.php -->
<?php
use yii\helpers\Html;
use yii\widgets\ActiveForm;
 
$this->title = 'Login';
?>
 
<h1><?= Html::encode($this->title) ?></h1>
 
<?php $form = ActiveForm::begin(); ?>
 
<?= $form->field($model, 'username')->textInput(['autofocus' => true]) ?>
<?= $form->field($model, 'password')->passwordInput() ?>
<?= $form->field($model, 'rememberMe')->checkbox() ?>
 
<div class="form-group">
    <?= Html::submitButton('Login', ['class' => 'btn btn-primary']) ?>
</div>
 
<?php ActiveForm::end(); ?>

6. AccessControl Filter

AccessControl is a behavior you attach to controllers. It checks access rules before any action runs — no RBAC setup required. Think of it as a bouncer at the door.

Basic Usage

// controllers/TaskController.php
use yii\filters\AccessControl;
 
public function behaviors(): array
{
    return [
        'access' => [
            'class' => AccessControl::class,
            'rules' => [
                [
                    'actions' => ['index', 'view'],
                    'allow'   => true,
                    'roles'   => ['?'],  // guests can view
                ],
                [
                    'actions' => ['create', 'update', 'delete'],
                    'allow'   => true,
                    'roles'   => ['@'],  // only authenticated users
                ],
            ],
        ],
    ];
}

Role Symbols

SymbolMeaning
?Guest (not logged in)
@Authenticated (any logged-in user)
adminRBAC role named "admin" (requires RBAC setup)

Rule Properties

Each rule in the rules array is a yii\filters\AccessRule with these properties:

PropertyTypePurpose
actionsarrayAction IDs this rule applies to (empty = all)
allowbooltrue to allow, false to deny
rolesarray?, @, or RBAC role/permission names
ipsarrayIP whitelist (e.g., ['127.0.0.1'])
verbsarrayHTTP methods (e.g., ['POST', 'DELETE'])
matchCallbackcallableCustom matching logic

Advanced AccessControl

'access' => [
    'class' => AccessControl::class,
    'only' => ['create', 'update', 'delete'],  // only check these actions
    'rules' => [
        [
            'allow' => true,
            'roles' => ['@'],
            'matchCallback' => function ($rule, $action) {
                // Only allow during business hours
                $hour = (int) date('H');
                return $hour >= 9 && $hour < 17;
            },
        ],
    ],
    'denyCallback' => function ($rule, $action) {
        throw new \yii\web\ForbiddenHttpException('Access denied.');
    },
],

Combining with VerbFilter

It's common to use AccessControl together with VerbFilter for REST-style controllers:

use yii\filters\AccessControl;
use yii\filters\VerbFilter;
 
public function behaviors(): array
{
    return [
        'access' => [
            'class' => AccessControl::class,
            'rules' => [
                ['actions' => ['index', 'view'], 'allow' => true, 'roles' => ['?']],
                ['actions' => ['create'], 'allow' => true, 'roles' => ['@']],
                ['actions' => ['update', 'delete'], 'allow' => true, 'roles' => ['admin']],
            ],
        ],
        'verbs' => [
            'class' => VerbFilter::class,
            'actions' => [
                'delete' => ['POST'],
            ],
        ],
    ];
}

7. RBAC Overview

AccessControl is fine for simple cases (guest vs logged in). But real apps need more nuance:

  • "Authors can edit their own posts, but not others'"
  • "Moderators can delete any comment"
  • "Admins can do everything"

This is where RBAC (Role-Based Access Control) comes in. Yii2's RBAC is a tree of three node types:

Node TypePurposeExample
RoleA named group of permissionsadmin, author, moderator
PermissionA specific capabilitycreateTask, updateTask, deleteTask
RuleDynamic condition checked at runtime"Is this user the author of this task?"

Roles contain permissions. Permissions can have rules. Users are assigned roles.


8. Setting Up RBAC with DbManager

Yii2 provides two RBAC managers:

ManagerStorageBest For
PhpManagerPHP filesSimple apps, few roles
DbManagerDatabase tablesProduction apps, dynamic roles

We'll use DbManager — it's the right choice for any non-trivial app.

8.1 Configure the AuthManager

// config/web.php (and config/console.php — needed for migrations!)
'components' => [
    'authManager' => [
        'class' => 'yii\rbac\DbManager',
    ],
],

Important: Add authManager to config/console.php too — the migration command runs in console context.

8.2 Create the RBAC Tables

Yii2 ships with a built-in migration for RBAC tables:

php yii migrate --migrationPath=@yii/rbac/migrations

This creates four tables:

TablePurpose
auth_ruleCustom rules (PHP classes)
auth_itemRoles and permissions
auth_item_childParent-child relationships (role → permission)
auth_assignmentUser ↔ role assignments

8.3 Initialize Roles and Permissions

Create a console command to set up your initial RBAC hierarchy:

// commands/RbacController.php
namespace app\commands;
 
use Yii;
use yii\console\Controller;
 
class RbacController extends Controller
{
    public function actionInit(): void
    {
        $auth = Yii::$app->authManager;
 
        // Remove all previous data
        $auth->removeAll();
 
        // --- Permissions ---
        $createTask = $auth->createPermission('createTask');
        $createTask->description = 'Create a new task';
        $auth->add($createTask);
 
        $viewTask = $auth->createPermission('viewTask');
        $viewTask->description = 'View tasks';
        $auth->add($viewTask);
 
        $updateOwnTask = $auth->createPermission('updateOwnTask');
        $updateOwnTask->description = 'Update own tasks';
        $auth->add($updateOwnTask);
 
        $updateAnyTask = $auth->createPermission('updateAnyTask');
        $updateAnyTask->description = 'Update any task';
        $auth->add($updateAnyTask);
 
        $deleteOwnTask = $auth->createPermission('deleteOwnTask');
        $deleteOwnTask->description = 'Delete own tasks';
        $auth->add($deleteOwnTask);
 
        $deleteAnyTask = $auth->createPermission('deleteAnyTask');
        $deleteAnyTask->description = 'Delete any task';
        $auth->add($deleteAnyTask);
 
        $manageUsers = $auth->createPermission('manageUsers');
        $manageUsers->description = 'Manage user accounts';
        $auth->add($manageUsers);
 
        // --- Rules ---
        $isAuthorRule = new \app\rbac\IsAuthorRule();
        $auth->add($isAuthorRule);
 
        // Attach rule to "own" permissions
        $updateOwnTask->ruleName = $isAuthorRule->name;
        $auth->update('updateOwnTask', $updateOwnTask);
 
        $deleteOwnTask->ruleName = $isAuthorRule->name;
        $auth->update('deleteOwnTask', $deleteOwnTask);
 
        // --- Roles ---
 
        // Author role
        $author = $auth->createRole('author');
        $author->description = 'Regular user who can manage their own tasks';
        $auth->add($author);
        $auth->addChild($author, $viewTask);
        $auth->addChild($author, $createTask);
        $auth->addChild($author, $updateOwnTask);
        $auth->addChild($author, $deleteOwnTask);
 
        // Admin role (inherits all author permissions + more)
        $admin = $auth->createRole('admin');
        $admin->description = 'Administrator with full access';
        $auth->add($admin);
        $auth->addChild($admin, $author);        // inherits author permissions
        $auth->addChild($admin, $updateAnyTask);
        $auth->addChild($admin, $deleteAnyTask);
        $auth->addChild($admin, $manageUsers);
 
        echo "RBAC hierarchy created.\n";
    }
}

Run it:

php yii rbac/init

8.4 Assign Roles to Users

After registration, assign the default role:

// In SignupForm::signup() after $user->save()
$auth = Yii::$app->authManager;
$authorRole = $auth->getRole('author');
$auth->assign($authorRole, $user->id);

For promoting a user to admin:

$auth = Yii::$app->authManager;
$adminRole = $auth->getRole('admin');
$auth->assign($adminRole, $userId);

9. Writing Custom Rules

Rules are PHP classes that evaluate dynamic conditions at runtime. The IsAuthorRule checks if the current user created the resource:

// rbac/IsAuthorRule.php
namespace app\rbac;
 
use yii\rbac\Rule;
 
class IsAuthorRule extends Rule
{
    public $name = 'isAuthor';
 
    /**
     * @param int|string $userId   The user ID
     * @param \yii\rbac\Item $item The role or permission this rule is attached to
     * @param array $params        Extra params passed to can()
     */
    public function execute($userId, $item, $params): bool
    {
        if (!isset($params['task'])) {
            return false;
        }
        return $params['task']->user_id == $userId;
    }
}

Using the Rule in Controllers

// controllers/TaskController.php
public function actionUpdate(int $id): string|\yii\web\Response
{
    $task = Task::findOne($id);
    if ($task === null) {
        throw new \yii\web\NotFoundHttpException('Task not found.');
    }
 
    // Check RBAC: can this user update THIS task?
    if (!Yii::$app->user->can('updateOwnTask', ['task' => $task])
        && !Yii::$app->user->can('updateAnyTask')) {
        throw new \yii\web\ForbiddenHttpException('You are not allowed to update this task.');
    }
 
    if ($task->load(Yii::$app->request->post()) && $task->save()) {
        return $this->redirect(['view', 'id' => $task->id]);
    }
 
    return $this->render('update', ['model' => $task]);
}

The can() method:

Yii::$app->user->can('permissionName');                    // simple check
Yii::$app->user->can('updateOwnTask', ['task' => $task]); // with params for rule

When you call can('updateOwnTask', ['task' => $task]):

  1. RBAC finds the updateOwnTask permission
  2. Sees it has ruleName = 'isAuthor'
  3. Instantiates IsAuthorRule and calls execute()
  4. execute() compares $task->user_id with the current user ID
  5. Returns true only if the user owns the task

10. Protecting the TaskController

Let's put it all together. Here's the full TaskController with both AccessControl and RBAC checks:

// controllers/TaskController.php
namespace app\controllers;
 
use Yii;
use yii\web\Controller;
use yii\web\NotFoundHttpException;
use yii\web\ForbiddenHttpException;
use yii\filters\AccessControl;
use yii\filters\VerbFilter;
use app\models\Task;
 
class TaskController extends Controller
{
    public function behaviors(): array
    {
        return [
            'access' => [
                'class' => AccessControl::class,
                'rules' => [
                    // Anyone can view
                    ['actions' => ['index', 'view'], 'allow' => true, 'roles' => ['?', '@']],
                    // Only logged-in users can create/update/delete
                    ['actions' => ['create', 'update', 'delete'], 'allow' => true, 'roles' => ['@']],
                ],
            ],
            'verbs' => [
                'class' => VerbFilter::class,
                'actions' => [
                    'delete' => ['POST'],
                ],
            ],
        ];
    }
 
    public function actionIndex(): string
    {
        $tasks = Task::find()
            ->with('user')
            ->orderBy(['created_at' => SORT_DESC])
            ->all();
 
        return $this->render('index', ['tasks' => $tasks]);
    }
 
    public function actionView(int $id): string
    {
        return $this->render('view', ['model' => $this->findModel($id)]);
    }
 
    public function actionCreate(): string|\yii\web\Response
    {
        if (!Yii::$app->user->can('createTask')) {
            throw new ForbiddenHttpException('You are not allowed to create tasks.');
        }
 
        $model = new Task();
        $model->user_id = Yii::$app->user->id;
 
        if ($model->load(Yii::$app->request->post()) && $model->save()) {
            Yii::$app->session->setFlash('success', 'Task created.');
            return $this->redirect(['view', 'id' => $model->id]);
        }
 
        return $this->render('create', ['model' => $model]);
    }
 
    public function actionUpdate(int $id): string|\yii\web\Response
    {
        $model = $this->findModel($id);
 
        // RBAC: check updateOwnTask (with rule) OR updateAnyTask
        if (!Yii::$app->user->can('updateOwnTask', ['task' => $model])
            && !Yii::$app->user->can('updateAnyTask')) {
            throw new ForbiddenHttpException('You are not allowed to update this task.');
        }
 
        if ($model->load(Yii::$app->request->post()) && $model->save()) {
            Yii::$app->session->setFlash('success', 'Task updated.');
            return $this->redirect(['view', 'id' => $model->id]);
        }
 
        return $this->render('update', ['model' => $model]);
    }
 
    public function actionDelete(int $id): \yii\web\Response
    {
        $model = $this->findModel($id);
 
        if (!Yii::$app->user->can('deleteOwnTask', ['task' => $model])
            && !Yii::$app->user->can('deleteAnyTask')) {
            throw new ForbiddenHttpException('You are not allowed to delete this task.');
        }
 
        $model->delete();
        Yii::$app->session->setFlash('success', 'Task deleted.');
 
        return $this->redirect(['index']);
    }
 
    protected function findModel(int $id): Task
    {
        $model = Task::findOne($id);
        if ($model === null) {
            throw new NotFoundHttpException('Task not found.');
        }
        return $model;
    }
}

The pattern is:

  1. AccessControl acts as the first gate — are you logged in?
  2. RBAC checks inside actions act as the second gate — do you have the right permission for this specific resource?

11. Showing/Hiding UI Elements

In views, use can() to show or hide buttons based on permissions:

<!-- views/task/view.php -->
<?php if (Yii::$app->user->can('updateOwnTask', ['task' => $model])
    || Yii::$app->user->can('updateAnyTask')): ?>
    <?= Html::a('Edit', ['update', 'id' => $model->id], ['class' => 'btn btn-primary']) ?>
<?php endif; ?>
 
<?php if (Yii::$app->user->can('deleteOwnTask', ['task' => $model])
    || Yii::$app->user->can('deleteAnyTask')): ?>
    <?= Html::a('Delete', ['delete', 'id' => $model->id], [
        'class' => 'btn btn-danger',
        'data' => [
            'confirm' => 'Are you sure you want to delete this task?',
            'method' => 'post',
        ],
    ]) ?>
<?php endif; ?>

For navigation items:

// views/layouts/main.php
$menuItems = [
    ['label' => 'Tasks', 'url' => ['/task/index']],
];
 
if (Yii::$app->user->can('manageUsers')) {
    $menuItems[] = ['label' => 'Users', 'url' => ['/user/index']];
}
 
if (Yii::$app->user->isGuest) {
    $menuItems[] = ['label' => 'Login', 'url' => ['/site/login']];
    $menuItems[] = ['label' => 'Sign Up', 'url' => ['/site/signup']];
} else {
    $menuItems[] = ['label' => 'Logout (' . Yii::$app->user->identity->username . ')',
        'url' => ['/site/logout'],
        'linkOptions' => ['data-method' => 'post']
    ];
}

12. RBAC Hierarchy Visualization

Here's the complete permission tree for our task manager:

When can() is called, Yii2 walks the tree:

  1. Find the user's assigned role (e.g., author)
  2. Walk all child permissions recursively
  3. If a matching permission has a rule, execute it
  4. Return true only if the permission exists AND the rule passes

Since admin has author as a child, admins automatically inherit all author permissions — no duplication needed.


13. Common Patterns

Check Multiple Permissions

// Helper method in User model
public function canAny(array $permissions, array $params = []): bool
{
    foreach ($permissions as $permission) {
        if (Yii::$app->user->can($permission, $params)) {
            return true;
        }
    }
    return false;
}

Default Role for New Users

Instead of assigning in signup, use defaultRoles:

// config/web.php
'authManager' => [
    'class' => 'yii\rbac\DbManager',
    'defaultRoles' => ['author'],
],

This makes every authenticated user an author without needing an auth_assignment row. Useful when you have a single default role.

Revoking and Reassigning Roles

$auth = Yii::$app->authManager;
 
// Revoke a specific role
$role = $auth->getRole('author');
$auth->revoke($role, $userId);
 
// Revoke all roles
$auth->revokeAll($userId);
 
// Get all roles for a user
$roles = $auth->getRolesByUser($userId);
// Returns: ['author' => Role object, ...]

Checking Roles in Console Commands

RBAC works in console context too — just make sure authManager is in config/console.php:

// commands/SomeController.php
$auth = Yii::$app->authManager;
$admins = $auth->getUserIdsByRole('admin');
// Returns array of user IDs with admin role

What's Next

Your task manager now has a complete security layer:

  • Users can register, log in, and log out
  • AccessControl guards controller actions (guest vs authenticated)
  • RBAC provides granular permissions (author vs admin, own vs any)
  • Custom rules handle dynamic checks (is this my task?)
  • UI elements show/hide based on permissions

Deep Dive → Forms, Validation & Data Input — build complex forms with nested models, file uploads, AJAX validation, custom validators, and data formatting with Yii2's powerful form system.

← Phase 3: Active Record & Database | → Series Overview

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