title: add new element in laravel collection object
body: <p>I want to add new element in <code>$items</code> array, I don't want to use joins for certain reasons.</p>
  
  <pre><code>$items = DB::select(DB::raw('SELECT * FROM items WHERE items.id = '.$id.'  ;'));
          foreach($items as $item){
              $product = DB::select(DB::raw(' select * from product
                     where product_id = '. $id.';' ));
  
              $item-&gt;push($product);
          }
  </code></pre>
  
  <p>What should I do?</p>