YII自定义小部件

案例如下 

common/widgets/TopMenu.php(地址可以自定义位置，命名空间一定要对应)

<?php
/**
 * Created by PhpStorm.
 * Date: 2016/5/26
 * Time: 18:09
 * 头部尾部小部件
 */
namespace common\widgets;

use yii\base\Widget;

class TopMenu extends Widget{

    public function init(){
        parent::init();
        echo "<ul>";
    }

    public function run(){
        return "</ul>";
    }

    public function addMenu($menuName){
        return "<li>".$menuName."</li>";
    }
}

视图 menu.php

<?php
/**
 * Created by PhpStorm.
 * Date: 2016/5/26
 * Time: 18:15
 */
    use common\widgets\TopMenu;
?>
<div>
    <?php $menu = TopMenu::begin();?>
        <?= $menu->addMenu('menu1');?>
        <?= $menu->addMenu('menu2');?>
        <?= $menu->addMenu('menu3');?>
        <?= $menu->addMenu('menu4');?>
        <?= $menu->addMenu('menu5');?>
    <?php TopMenu::end();?>
</div>

控制器

public function actionMenu(){
        return $this->renderPartial("menu");
    }