Есть вот такая функция для минификаии разметки в WordPress:

/* Minifies HTML and removes comments (except IE tags and comments within script tags)
 *
 * To disable compression of code portions, use '<!--wp-html-compression no compression-->' tag
 *
 * @see http://forrst.com/posts/Wordpress_Minify_output_HTML-29q
 * @see http://www.intert3chmedia.net/2011/12/minify-html-javascript-css-without.html
 */
class WP_HTML_Compression {
  // Settings
  protected $compress_css = true;
  protected $compress_js = false;
  protected $info_comment = true;
  protected $remove_comments = true;

  // Variables
  protected $html;

  public function __construct($html) {
    if (!empty($html)) {
      $this->parseHTML($html);
    }
  }

  public function __toString() {
    return $this->html;
  }

  protected function minifyHTML($html) {
    $pattern = '/<(?<script>script).*?<\/script\s*>|<(?<style>style).*?<\/style\s*>|<!(?<comment>--).*?-->|<(?<tag>[\/\w.:-]*)(?:".*?"|\'.*?\'|[^\'">]+)*>|(?<text>((<[^!\/\w.:-])?[^<]*)+)|/si';
    preg_match_all($pattern, $html, $matches, PREG_SET_ORDER);
    $overriding = false;
    $raw_tag = false;
    // Variable reused for output
    $html = '';
    foreach ( $matches as $token ) {
      $tag = (isset($token['tag'])) ? strtolower($token['tag']) : null;
      $content = $token[0];
      if ( is_null( $tag ) ) {
        if ( !empty( $token['script'] ) ) {
          $strip = $this->compress_js;
        } else if ( !empty($token['style'] ) ) {
          $strip = $this->compress_css;
        } else if ( $content == '<!--wp-html-compression no compression-->' ) {
          $overriding = !$overriding;
          // Don't print the comment
          continue;
        } else if ( $this->remove_comments ) {
          if ( !$overriding && $raw_tag != 'textarea' ) {
            // Remove any HTML comments, except MSIE conditional comments
            $content = preg_replace('/<!--(?!\s*(?:\[if [^\]]+]|<!|>))(?:(?!-->).)*-->/s', '', $content);
          }
        }
      } else {
        if ( $tag == 'pre' || $tag == 'textarea' || $tag == 'script' ) {
          $raw_tag = $tag;
        } else if ( $tag == '/pre' || $tag == '/textarea' || $tag == '/script' ) {
          $raw_tag = false;
        } else {
          if ($raw_tag || $overriding) {
            $strip = false;
          } else {
            $strip = true;
            // Remove any empty attributes, except:
            // action, alt, content, src
            $content = preg_replace('/(\s+)(\w++(?<!\baction|\balt|\bcontent|\bsrc)="")/', '$1', $content);
            // Remove any space before the end of self-closing XHTML tags
            // JavaScript excluded
            $content = str_replace(' />', '/>', $content);
          }
        }
      }
      if ( $strip ) {
        $content = $this->removeWhiteSpace($content);
      }
      $html .= $content;
    }
    return $html;
  }
  public function parseHTML($html) {
    $this->html = $this->minifyHTML($html);
  }
  protected function removeWhiteSpace($str) {
    $str = str_replace( "\t", ' ', $str );
    $str = str_replace( "\n",  '', $str );
    $str = str_replace( "\r",  '', $str );

    while ( stristr($str, '  ' ) ) {
      $str = str_replace('  ', ' ', $str);
    }
    return $str;
  }
}
function wp_html_compression_finish($html) {
  return new WP_HTML_Compression($html);
}
function wp_html_compression_start() {
  ob_start( 'wp_html_compression_finish' );
}
add_action( 'get_header', 'wp_html_compression_start' );

Хочется, чтобы при просмотра исходника перед минифицированным кодом был html-комментарий такого вида:

<!--

Поздравляем!

Мир Шаров дарит 300 рублей новым пользователям по промокоду SHAR.

-->

Как такое сделать в этой функции? Подскажите, пожалуйста?