title: How can I comment out PHP lines inside HTML file?
body: <p>In the middle my HTML code, I have a line of PHP. now, I want to make PHP line as a comment.
  I tried to ues <code>&lt;!--  --&gt;</code> but it seems not work for PHP.</p>
  
  <p>What should I do?</p>
  
  <p>Thanks </p>