title: How to add up diff in Carbon in laravel
body: <p>I have all this Carbon diff's (time intervals)</p>
  
  <pre><code>$end = Carbon::parse($agentData[$i+1]['created_at']);
  $str = Carbon::parse($agentData[$i]['created_at']);
  $result['availableTimeDiff'][$agentID][$agentData[$i+1]['lead_id']] = $end-&gt;diff($str)-&gt;format('%H:%I:%S');
  
  
  "00:00:08"
  "00:00:14"
  "00:09:57"
  "00:05:45"
  "00:00:27"
  </code></pre>
  
  <p>need to sum up all this time in Carbon laravel</p>