Menu in Yii2

Yii2_Menu.php

<?= Menu::widget([
    'encodeLabels' => false,
    'options'=>['id'=>'main-menu','class'=>'gui-controls'],
    'items' => [
        ['label' => '<div class="gui-icon"><i class="md md-home" ></i></div><span class="title">Dashboard</span>', 'url' => ['site/index']],
        ['label' => '<div class="gui-icon"><i class="md md-email"></i></div><span class="title">Email</span>', 'url' => '#','options'=>['class'=>'gui-folder'], 'items' => [
            ['label' => 'Componer', 'url' => ['email/componer']],
            ['label' => 'Inbox', 'url' => ['email/inbox']],
        ]],
        ['label' => 'Login', 'url' => ['site/login'], 'visible' => Yii::$app->user->isGuest],
    ],
    ]); 
?>