code: public static function header($title, $style = 'title')
      {
          $title = str_pad($title, self::$lineLength, ' ', STR_PAD_RIGHT);
          self::writeln($title, $style);
          self::separator('=');
      }
docs: Write header (title + separator).
  
  @param string $title
  @param string $style Default 'title'.