Yii2 Drop list down value mapping

yii2-droplist

<?php
# Drop down list value mapping

# File models/Report.php

public function areaTypeMapping() {
    return ['公共区域', '办公区域'];
}

# views/report/_form.php
$form->field($model, 'areatype')->dropDownList($model->areaTypeMapping());

# views/report/index.php
GridView::widget([
        'dataProvider' => $dataProvider,
        'filterModel' => $isAdmin ? $searchModel : null,
        'columns' => [
            'id',
            'phone',
            //'areatype',
            [
                'attribute' => 'areatype',
                'label' => '类型',
                'content' => function($model, $key, $index, $column) {
                    $m = $model->areaTypeMapping();
                    return $m[$model->areatype];
                },
            ],
            'area',
            'content',
            // 'image',

            ['class' => 'yii\grid\ActionColumn'],
        ],
    ]);