title: Add 1 hour on mysql timestamp in php
body: <p>In my Mysql table I have a timestamp field.
  In my php page I show the record ($row[data]) in this way</p>
  
  <pre><code>echo date("d-m-Y H:i:s", strtotime($row['data']));
  </code></pre>
  
  <p>Now in my php I'd like to add 1 hour on my date.
  How can I do this?
  Thanks</p>