在一行语句里调用一个类的多个方法，该如何写

$this->m_button6PaneInfo->Movable( false )->Dock()->Fixed()->BottomDockable( false )->TopDockable( false )->Layer( 10 )->ToolbarPane();

class testcls{
    function fun1(){
        echo 'fun1';
        return $this;
    }
    function fun2(){
        echo 'fun1';
        return $this;
    }
    function fun3(){
        echo 'fun3';
        return $this;
    }
}
$test = new testcls();
$test->fun1()->fun2()->fun3();