yii2:drop-down list for multiple values concat in one line

Question

for my drop-down list I am using this code.

<?= $form->field($medicinerequest, '[' . $id . ']' . 'medicine_name') ->DropDownList(ArrayHelper::map(\app\models\Medicine::find() ->asArray()->all(), 'id', 'medicine_name','medicine_id' ), [ 'prompt' => 'Please Select' ])?>  

I am getting the drop-down list as in the picture. But I want it to be concatenated by hyphen(-) in one line. How can I do this?

Answer 1

ArrayHelper::map($array, $from, $to, $group) uses ArrayHelper::getValue() to obtain the values of $from, $to and $group. ArrayHelper::getValue() allows you to pass closures.

The anonymous function signature should be: function($array, $defaultValue).

As such you can set $to as

ArrayHelper::map(     \app\models\Medicine::find()->asArray()->all(),     'id',     function($model) {         return $model['medicine_name'].'-'.$model['medicine_id'];     } )