在一行语句里调用一个类的多个方法，该怎么写？

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

<?phpclass testcls{	function fun1(){		echo 'fun1';	}	function fun2(){		echo 'fun1';	}	function fun3(){		echo 'fun3';	}}$test = new testcls();$test->fun1()->fun2()->fun3();?>

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();