title: How to add item to an array inside a collection in Laravel
body: <p>I have a Laravel Request object (collection) and there is an array inside this (address array)
  I want to add a item to this array.
  I tried <code>$request-&gt;address['state'] = 'test';</code> and following error occurred.</p>
  
  <blockquote>
    <p>Indirect modification of overloaded property Illuminate\Http\Request::$address has no effect</p>
  </blockquote>
  
  <p><a href="https://i.stack.imgur.com/yoUzQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/yoUzQ.png" alt="Here is the request collection"></a></p>
  
  <p>I want to add a item like highlighted in this img</p>