How to make navigation widget?

Question

Yii

A little confused with the widget, how to display data through foreach. That is, I want to embed all the topics exactly there and shove everything as they are created

<?php
namespace frontend\components;
use app\models\Knowledge;
use yii\base\Widget;
use yii\helpers\ArrayHelper;
use yii\helpers\Html;

class NavKnowledge extends Widget
{
    public function init()
    {
        parent::init(); // TODO: Change the autogenerated stub
    }

    public function run()
    {
        parent::run(); // TODO: Change the autogenerated stub
        $name = ArrayHelper::map(Knowledge::find()->all(), 'id', 'title');
        echo '<ul class="nav nav-pills nav-stacked">'.
            foreach ($name as $key => $value){
                echo '<li>'. Html::a($value, ['site/post', 'id' => $key]).'</li>';
            }.'
        </ul>';
        return $name;
    }
}

Answer 1

Why doesn't www.yiiframework.com/doc-2.0/yii-bootstrap-nav.html suit you ?