code: public function getConfigValue($name)
      {
          $config = $this->getConfig();
  
          $path = explode('.', (string)$name);
          foreach ($path as $entry) {
              if (isset($config[$entry])) {
                  $config =& $config[$entry];
              } else {
                  return null;
              }
          }
  
          return $config;
      }
docs: Returns the value of a config entry.
  The name can be a namespace, each name being separated by a dot, like: 'itemCaching.enabled'
  @param string $name
  @return mixed