使用看云 手册中的示例代码：

<php>
	$category_ids=1;</php><portal:articles limit="5" order="post.published_time DESC"
                 categoryIds="$category_ids">
    <dl class="dl-horizontal">
        <dt>
            <a class="img-wraper"
               href="{:url('portal/Article/index',array('id'=>$vo.id,'cid'=>$vo.category_id))}">
                <if condition="empty($vo.more.thumbnail)">
                    <img src="__TMPL__/public/assets/images/default_tupian4.png"
                         class="img-responsive" alt="{$vo.post_title}"/>
                    <else/>
                    <img src="{:cmf_get_image_url($vo.more.thumbnail)}"
                         class="img-responsive" alt="{$vo.post_title}"/>
                </if>
            </a>
        </dt>
        <dd>
            <a href="{:url('portal/Article/index',array('id'=>$vo['id'],'cid'=>$vo.category_id))}">{$vo.post_title}</a>
        </dd>
    </dl></portal:articles>

提示 category_id 为未定义索引值，

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