title: PHP How many days old is this date?
body: <p>Im trying to work out how many days old is a date in my database.</p>
  
  <p>For example with this date:</p>
  
  <pre><code>$postdate = '2013-12-19';
  </code></pre>
  
  <p>I want it to work out that it is 1 day old. If it is todays date then it should be 0.</p>
  
  <p>How can i do this in PHP?</p>
  
  <p>Thanks</p>