Active Field

       <?= $form->field($site, 'phone_1', 
                    ['template' => "{label}\n<div class=\"col-lg-3\">" .
                      Html::dropDownList('phone_comment_1', 0, ArrayHelper::map( PhoneComment::find()->all(), 'id', 'name'), ['class' => 'form-control b-right'] ) .                    
                    "{input}</div>\n<div class=\"col-lg-7\">{error}</div>", 
                    'inputOptions' => ['class' => 'form-control b-left', 'id' => 'phone_1']]) 
                    ?>

Источник