ref::config PHP Method

    public static function config($key, $value = null)
    {
        if (!array_key_exists($key, static::$config)) {
            throw new \Exception(sprintf('Unrecognized option: "%s". Valid options are: %s', $key, implode(', ', array_keys(static::$config))));
        }
        if ($value === null) {
            return static::$config[$key];
        }
        if (is_array(static::$config[$key])) {
            return static::$config[$key] = (array) $value;
        }
        return static::$config[$key] = $value;
    }

 /**
  * Setup ref
  * 
  * @return void
  */
 public static function init()
 {
     \ref::config('expLvl', 0);
     \ref::config('maxDepth', 10);
     \ref::config('showIteratorContents', TRUE);
     \ref::config('showPrivateMembers', TRUE);
 }