code: public static function modify( $tpl, $operatorName, $operatorParameters, $rootNamespace, $currentNamespace, &$operatorValue, $namedParameters, $placement )
      {
          if ( $operatorName === 'has_tags_bundle' ) {
              $operatorValue = class_exists('Netgen\TagsBundle\Version') && TagsBundleVersion::VERSION_ID >= 30000;
          }
      }
docs: Executes the template operator
  
  @param eZTemplate $tpl
  @param string $operatorName
  @param mixed $operatorParameters
  @param string $rootNamespace
  @param string $currentNamespace
  @param mixed $operatorValue
  @param array $namedParameters
  @param mixed $placement