public static function clearInstance($name)
  {
    $key = self::_instanceKey($name);
    
    if (isset(self::$_instances[$key])) {
      unset(self::$_instances[$key]);
    }
  }
public static function clearInstance($name)
  {
    $key = self::_instanceKey($name);
    
    if (isset(self::$_instances[$key])) {
      unset(self::$_instances[$key]);
    }
  }
public static function clearInstance ( $ name ) { $ key = self :: _instanceKey ( $ name ) ; if ( isset ( self :: $ _instances [ $ key ] ) ) { unset ( self :: $ _instances [ $ key ] ) ; } }
Unloads config instance.

@param string $name Config name

@return null
Unloads config instance .