[WordPress] Remove website and email fields from comments form

functions.php

function website_and_email_remove($fields) {
  if(isset($fields['url'])) {
    unset($fields['url']);
  }
  if (isset($fields['email'])) {
    unset($fields['email']);
  }
  return $fields;
}
add_filter('comment_form_default_fields', 'website_and_email_remove');