code: public function get($key = null, $default = null)
      {
          if (!$key) {
              return $default;
          }
  
          $conf =& $this->conf;
          $keys = explode('.', $key);
  
          foreach ($keys as $test) {
              $direct = implode('.', $keys);
  
              // Check for a direct match, containing dot
              if (is_array($conf) && array_key_exists($direct, $conf)) {
                  return $conf[$direct];
              }
  
              if (!is_array($conf) || !array_key_exists($test, $conf)) {
                  // No hit, return the default
                  return $default;
              }
  
              $conf =& $conf[$test];
              array_shift($keys);
          }
  
          return $conf;
      }
docs: {@inheritdoc}