yii/framework/cli/views/webapp/protected/controllers/SiteController.php

<?php

class SiteController extends CController
{
	/**
	 * Declares class-based actions.
	 */
	public function actions()
	{
		return array(
			// captcha action renders the CAPTCHA image
			'captcha'=>array(
				'class'=>'CCaptchaAction',
				'backColor'=>0xEBF4FB,
			),
		);
	}

	/**
	 * This is the default 'index' action that is invoked
	 * when an action is not explicitly requested by users.
	 */
	public function actionIndex()
	{
		// renders the view file 'protected/views/site/index.php'
		// using the default layout 'protected/views/layouts/main.php'
		$this->render('index');
	}

	/**
	 * Displays a login form to login a user.
	 */
	public function actionLogin()
	{
		$form=new LoginForm;
		// collect user input data
		if(isset($_POST['LoginForm']))
		{
			$form->attributes=$_POST['LoginForm'];
			// validate user input and redirect to previous page if valid
			if($form->validate())
				$this->redirect(Yii::app()->user->returnUrl);
		}
		// display the login form
		$this->render('login',array('form'=>$form));
	}

	/**
	 * Logout the current user and redirect to homepage.
	 */
	public function actionLogout()
	{
		Yii::app()->user->logout();
		$this->redirect(Yii::app()->homeUrl);
	}
}