title: How to get date page was last modified using php?
body: <p>I am using a php include function to include footer.html on every page on my site. In the footer I would like to have the date and time the page was last updated. How would I do this? So far the closest thing I found was filemtime() .</p>
  
  <p>The file that displays the page is called index.php (i.e www.example.com/gallery/index.php)</p>