Multi select in dropdown

Hi,

How can perform default selection in Yii multi select dropdown list? I mean select more the 2 items by default in yii2 dropdown list?




<?php $q_data= ArrayHelper::map(Quality::find()->where(['status'=>1])->all(),'id','name'); ?>


<?= Html::activeDropDownList($model, 'q_id',$q_data,['multiple'=>'multiple','class'=>'test','data-placeholder'=>Yii::t('app','Select')]); ?>