Yii Web Dev Book, Chapter 12, section: Adding a login message log

application.controllers.SiteController.actionLogin().php

        /**
	 * Displays the login page
	 */
	public function actionLogin()
	{
		Yii::trace("The actionLogin() method is being requested", "application.controllers.SiteController");
		
		//if they are already logged in, redirect them to the home page
		if(!Yii::app()->user->isGuest) 
		{
			$this->redirect(Yii::app()->homeUrl);
		}
		
		
		$model=new LoginForm;

		// if it is ajax validation request
		if(isset($_POST['ajax']) && $_POST['ajax']==='login-form')
		{
			echo CActiveForm::validate($model);
			Yii::app()->end();
		}

		// collect user input data
		if(isset($_POST['LoginForm']))
		{
			$model->attributes=$_POST['LoginForm'];
			// validate user input and redirect to the previous page if valid
			if($model->validate() && $model->login()) 
			{
				Yii::log("Successful login of user: " . Yii::app()->user->id, "info", "application.controllers.SiteController");
				$this->redirect(Yii::app()->user->returnUrl);
			}
			else
			{
				Yii::log("Failed login attempt", "warning", "application.controllers.SiteController");
			}
				
		}
		// display the login form
		$this->render('login',array('model'=>$model));
	}