title: Convert string to time in php
body: <p>How to convert <code>"2011-11-03T17:27:56Z"</code> to time in php.</p>
  
  <p>I want time difference from current time.</p>
  
  <p>i.e. if time difference from current time is 10 minutes the I want 10 minutes. If its 1 day then I want 1 day.</p>