title: how to convert minutes into hours:minutes:seconds?
body: <p>I have a no. of minute. how to convert minutes into hours.I use following code but it is not working properly.</p>
  
  <pre><code>$duration  = "100";
  $duration = strtotime($duration." minutes");
  echo $duration = date('H:i:s', $duration);
  </code></pre>
  
  <p><code>expected output: 01:40:00</code></p>
  
  <p>but it gives this output:<code>15:10:02</code></p>
  
  <p>Thanks in advance.</p>