widget(Menu::className(), array(
'options' => array('class' => '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')),
),
)); ?>