title: Is there a PHP function to test a zero date
body: <p>Looking for a shorthand or better way to test a zero date (MySQL datetime column) other than:</p>
  
  <pre><code>if ($row['this_date'] == '0000-00-00 00:00:00') echo 'No date set.';
  </code></pre>
  
  <p>Is there a PHP function that test it? Thanks.</p>