code: public function getRegistry($var = null, $section = false, $default = false)
      {
          if (is_null($var)) {
              return;
          }
          if ($section && isset($this->registry[$section])) {
              if (isset($this->registry[$section][$var])) {
                  return $this->registry[$section][$var];
              } else {
                  return $default;
              }
          }
          if (isset($this->registry[$var])) {
              return $this->registry[$var];
          }
          return $default;
      }
docs: Get a registry entry
  
  @param string $var The entry name
  @param string $section A sub-section to search the entry
  @param mixed $default The value returned if nothing had been found
  @return mixed The value of the entry if found, $default otherwise