original_string: protected static function getPluginArchivers()
      {
          if (empty(static::$archivers)) {
              $pluginNames = \Piwik\Plugin\Manager::getInstance()->getActivatedPlugins();
              $archivers = array();
              foreach ($pluginNames as $pluginName) {
                  $archivers[$pluginName] = self::getPluginArchiverClass($pluginName);
              }
              static::$archivers = array_filter($archivers);
          }
          return static::$archivers;
      }
code: protected static function getPluginArchivers()
      {
          if (empty(static::$archivers)) {
              $pluginNames = \Piwik\Plugin\Manager::getInstance()->getActivatedPlugins();
              $archivers = array();
              foreach ($pluginNames as $pluginName) {
                  $archivers[$pluginName] = self::getPluginArchiverClass($pluginName);
              }
              static::$archivers = array_filter($archivers);
          }
          return static::$archivers;
      }
code_tokens: protected static function getPluginArchivers ( ) { if ( empty ( static :: $ archivers ) ) { $ pluginNames = \ Piwik \ Plugin \ Manager :: getInstance ( ) -> getActivatedPlugins ( ) ; $ archivers = array ( ) ; foreach ( $ pluginNames as $ pluginName ) { $ archivers [ $ pluginName ] = self :: getPluginArchiverClass ( $ pluginName ) ; } static :: $ archivers = array_filter ( $ archivers ) ; } return static :: $ archivers ; }
docstring: Loads Archiver class from any plugin that defines one.
  
  @return \Piwik\Plugin\Archiver[]
docstring_tokens: Loads Archiver class from any plugin that defines one .