title: get time difference in hours minutes and seconds
body: <p>I have two dates,</p>
  
  <pre><code>$expiry_time = strtotime('comming from database');
  $current_date = strtotime(date('Y-m-d H:i:s'));
  $time_diff = ($expiry_time-$current_date)/(3600);
  </code></pre>
  
  <p>Here, <code>$time_diff</code> will give me difference in hours. eg. 5.67. But, I want it in hours, minute and second format. How can I achieve this?
  Thanks.</p>