main.php

<?php
use yii\helpers\Html;
use yii\widgets\Menu;
use yii\widgets\Breadcrumbs;

/**
 * @var $this \yii\base\View
 * @var $content string
 */
app\config\AppAsset::register($this);
?>
<?php $this->beginPage(); ?>
<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="utf-8"/>
	<title><?php echo Html::encode($this->title); ?></title>
	<?php $this->head(); ?>
</head>
<body>
<?php $this->beginBody(); ?>
	<div class="navbar navbar-inverse navbar-fixed-top">
		<div class="container">
			<?php echo Html::a('My Company', Yii::$app->homeUrl, array('class' => 'navbar-brand')); ?>
			<div class="nav-collapse collapse pull-right">
				<?php echo Menu::widget(array(
					'options' => array('class' => 'nav navbar-nav'),
					'items' => array(
						array('label' => 'Home', 'url' => array('/site/index')),
						array('label' => 'About', 'url' => array('/site/about')),
						array('label' => 'Contact', 'url' => array('/site/contact')),
						Yii::$app->user->isGuest ?
							array('label' => 'Login', 'url' => array('/site/login')) :
							array('label' => 'Logout (' . Yii::$app->user->identity->username .')' , 'url' => array('/site/logout')),
					),
				)); ?>
			</div>
		</div>
	</div>

	<div class="container">
		<?php echo Breadcrumbs::widget(array(
			'links' => isset($this->params['breadcrumbs']) ? $this->params['breadcrumbs'] : array(),
		)); ?>
		<?php echo $content; ?>
	</div>

	<footer class="footer">
		<div class="container">
			<p class="pull-left">&copy; My Company <?php echo date('Y'); ?></p>
			<p class="pull-right"><?php echo Yii::powered(); ?></p>
		</div>
	</footer>

<?php $this->endBody(); ?>
</body>
</html>
<?php $this->endPage(); ?>