public static function get_subplugins($component) {
        self::init();

        if (isset(self::$subplugins[$component])) {
            return self::$subplugins[$component];
        }

        return null;
    }
public static function get_subplugins($component) {
        self::init();

        if (isset(self::$subplugins[$component])) {
            return self::$subplugins[$component];
        }

        return null;
    }
public static function get_subplugins ( $ component ) { self :: init ( ) ; if ( isset ( self :: $ subplugins [ $ component ] ) ) { return self :: $ subplugins [ $ component ] ; } return null ; }
Return all subplugins of this component.
@param string $component.
@return array $subtype=>array($component, ..), null if no subtypes defined
Return all subplugins of this component .