title: PHP code is just comment on my html
body: <p>For some reason my code is just comment in my html.
  I have tried using localhost/filename.html etc
  and nothing seems to work...<br>
  Thank you!</p>
  
  <pre><code>&lt;html&gt;
  &lt;body&gt;
  &lt;?php
  echo "hello world";
  ?&gt;
  &lt;/body&gt;
  &lt;/html&gt;
  </code></pre>