magento 根据分类ID或名称获取该分类下的子分类

<?php
    $mo=Mage::getModel('catalog/category');
   $id=13;
    $mode=$mo->loadByAttribute('entity_id',$id);  这里是设置条件、根据类目实体ID 查询
    //$mode=$mo->loadByAttribute('name','Electronics'); 
     这个是 根据类目名称查询、这两个条件二选一。
    if($mode->hasChildren()) {
    $id = $mode->getChildren();
    $subCategories = Mage::getModel('catalog/category')->getCollection();
    $subCategories->getSelect()->where("e.entity_id in ($id)");
    $subCategories->addAttributeToSelect('*');
    $subCategories->load();
    }

?>
<?php  foreach($subCategories as $cate): ?>
   <li><a href="<?php echo $cate->getUrl();?>"><?=$cate['name']?></a></li>   
<?php endforeach; ?>