yii2 dropdownlist without model

Yii2 html dropdownlist

Dropdownlist without model example is showing below. In this section Arrayhelper and Html classes are uses. In dropdownlist the first attribute is $name ,the second attribute is $options and third attribute is $items array.

use yii\helpers\Html;
use yii\helpers\ArrayHelper;

Html::dropDownList('user_id', null,
      ArrayHelper::map(User::find()->all(), 'user_id', 'name'))