title: Laravel collection return collection with only field
body: <p>I have this Laravel collection with some fields:</p>
  
  <pre><code>Collection {#324 ▼
    #items: array:3 [▼
      0 =&gt; array:5 [▼
        "img_src" =&gt; "http://newregalospersonales.dev/./svg/regalos-personalizados-gift.svg"
        "img_alt" =&gt; "&lt;span&gt;Regalos&lt;/span&gt; originales"
        "class" =&gt; "personalised-gifts"
        "elements" =&gt; array:4 [▼
          0 =&gt; array:2 [▶]//element1
          1 =&gt; array:2 [▶]//element2
          2 =&gt; array:2 [▶]//element3
          3 =&gt; array:2 [▶]//element4
        ]
      ]
      1 =&gt; array:5 [▼
        "img_src" =&gt; "http://newregalospersonales.dev/./svg/love-gifts.svg"
        "img_alt" =&gt; "&lt;span&gt;Regalos&lt;/span&gt; románticos"
        "class" =&gt; "love-gifts"
        "elements" =&gt; array:4 [▼
          0 =&gt; array:2 [▶]//element1
          1 =&gt; array:2 [▶]//element2
          2 =&gt; array:2 [▶]//element3
          3 =&gt; array:2 [▶]//element4
        ]
      ]
      2 =&gt; array:5 [▼
        "img_src" =&gt; "http://newregalospersonales.dev/./svg/regalos-ocasiones-especiales.svg"
        "img_alt" =&gt; "&lt;span&gt;Detalles&lt;/span&gt;&lt;br&gt;de boda"
        "class" =&gt; "wedding"
        "elements" =&gt; array:4 [▼
          0 =&gt; array:2 [▶]//element1
          1 =&gt; array:2 [▶]//element2
          2 =&gt; array:2 [▶]//element3
          3 =&gt; array:2 [▶]//element4
        ]
      ]
    ]
  }
  </code></pre>
  
  <p>And I only get the collection with the field 'elements'.</p>
  
  <p>I want an result like this:</p>
  
  <pre><code>Collection {#324 ▼
    #items: array:3 [▼
      0 =&gt; array:4 [▼
          0 =&gt; array:2 [▶] //element1
          1 =&gt; array:2 [▶ //element2 
          2 =&gt; array:2 [▶] //element3
          3 =&gt; array:2 [▶] //element4
      ]
      1 =&gt; array:4 [▼
  
          0 =&gt; array:2 [▶] //element1
          1 =&gt; array:2 [▶] //element2
          2 =&gt; array:2 [▶] //element3
          3 =&gt; array:2 [▶] //element4
      ]
      2 =&gt; array:4 [▼
  
          0 =&gt; array:2 [▶] //element1
          1 =&gt; array:2 [▶] //element2
          2 =&gt; array:2 [▶] //element3
          3 =&gt; array:2 [▶] //element4
      ]
    ]
  }
  </code></pre>
  
  <p>Is there any way to do this?
  I´m using Laravel 5.3 version and I not have idea about that collection filter use for this case.</p>