title: Yii2- Form: I want to create 3 separate text field but with same name for Phone Number something like this (xxx - xxx-xxxx)
body: <p>I would like to create a phone number field in Yii2 form with 3 separate text fields but with same name: 
  <a href="https://i.stack.imgur.com/PLLUz.png" rel="nofollow noreferrer">something like image below</a>
  Not sure how that works in Yii2</p>