code: public function createServerInformationLink()
      {
          $serverUrls = [
              'http://httpd.apache.org/' => ['apache'],
              'http://nginx.org/' => ['nginx'],
              'http://lighttpd.net/' => ['lighttpd'],
              'http://gwan.com/' => ['g-wan', 'gwan'],
              'http://iis.net/' => ['iis', 'services'],
              'https://secure.php.net/manual/en/features.commandline.webserver.php' => ['development'],
          ];
          if (isset($_SERVER['SERVER_SOFTWARE'])) {
              foreach ($serverUrls as $url => $keywords) {
                  foreach ($keywords as $keyword) {
                      if (stripos($_SERVER['SERVER_SOFTWARE'], $keyword) !== false) {
                          return '<a href="' . $url . '" target="_blank">' . $this->htmlEncode($_SERVER['SERVER_SOFTWARE']) . '</a>';
                      }
                  }
              }
          }
  
          return '';
      }
docs: Creates string containing HTML link which refers to the home page of determined web-server software
  and its full name.
  @return string server software information hyperlink.