Yii中用递归方法实现无限级分类

用递归方法实现多级分类，适合分级不太多的分类，如三到四级。

数据库结构：

Model中（Category.php）

    /**
     * 获取全部分类信息
     */
    public function getAllcategory()
    {
        $sql = 'select * from '.$this->tableName().' order by id asc';
        $category = ZDBTool::QueryAll($sql);

        return $category;
    } 

Controller中（CategoryController.php）

    public function actionIndex()
    {
        global $category;
        $category = array();

        $category = Category::model()->getAllCategory();
        //print_r($category);

        //……其它内容省略

        $param = array(
            'model' => $model,
            'cat_arr' => $cat_arr,
            );
        $this->render('index', $param);
    }

    //无限分类递归数组
    public function get_cat_array($pid = 0)
    {
        //echo 'fid:'.$fid.' ';
        global $category;
        $arr = array();
        foreach($category as $index => $row){
            //对每个分类进行循环。
            if($category[$index]['pid'] == $pid){ //如果有子类
                $row['child'] = $this->get_cat_array($category[$index]['id']); //调用函数，传入参数，继续查询下级
                $arr[] = $row; //组合数组
            }
        }
        return $arr;
    }

View中（category/index.tpl）（本文只演示到三级分类，此处使用了Yii的smarty-view-renderer扩展）

    <div class="main">
        <div class="category">
            <form action="/category/create" method="post">
            <table class="table table-hover">
                <thead>
                    <tr>
                        <th style="width:10px;"></th>
                        <th>分类名称</th>
                        <th style="width:80px;">操作</th>
                    </tr>
                </thead>
                <tbody>
                    <tr>
                        <td></td>
                        <td colspan="4" class="border_btm" style="padding-top:15px;">
                            <a href="{$this->createUrl('category/create')}"><i class="icon-plus-sign-alt">+</i> 添加新分类</a>
                        </td>
                    </tr>
                {foreach from=$cat_arr key=k item=v}
                    <tr>
                        <td>{if !empty($v.child)}<a href="javascript:;"><i class="icon-chevron-down"></i></a>{/if}</td>
                        <td>
                            <div class="type-parent">{$v.title}&nbsp;&nbsp;
                            {if empty($row['pid'])}<a href="{$this->createUrl('category/create', ['pid'=>$v.id])}"><i class="icon-plus-sign-alt">+</i> 添加子分类</a>{/if}
                            </div>
                        </td>
                        <td>
                            <a href="{$this->createUrl('category/update', ['id'=>$v.id])}">编辑</a>&nbsp;&nbsp;
                            <a href="{$this->createUrl('category/delete', ['id'=>$v.id])}"
                            onclick="return confirm('确认删除此分类吗？');return false;">删除</a>
                        </td>
                    </tr>
                    {foreach from=$v.child key=k1 item=v1}
                    <tr>
                        <td>{if !empty($v1.child)}<a href="javascript:;"><i class="icon-chevron-down"></i></a>{/if}</td>
                        <td>
                            <div class="type-child">{$v1.title}&nbsp;&nbsp;{if $v1.pid!=0}
                            <a href="{$this->createUrl('category/create', ['pid'=>$v1.id])}">
                            <i class="icon-plus-sign-alt">+</i> 添加子分类</a>{/if}</div>
                        </td>
                        <td>
                            <a href="{$this->createUrl('category/update', ['id'=>$v1.id])}">编辑</a>&nbsp;&nbsp;
                            <a href="{$this->createUrl('category/delete', ['id'=>$v1.id])}"
                            onclick="return confirm('确认删除此分类吗？');return false;">删除</a>
                        </td>
                    </tr>
                        {foreach from=$v1.child key=k2 item=v2}
                        <tr>
                            <td></td>
                            <td>
                                <div class="type-child-child">{$v2.title}&nbsp;&nbsp;{if $v2.pid!=0}
                                <a href="{$this->createUrl('category/create', ['pid'=>$v2.id])}">
                                <i class="icon-plus-sign-alt">+</i> 添加子分类</a>{/if}</div>
                            </td>
                            <td>
                                <a href="{$this->createUrl('category/update', ['id'=>$v2.id])}">编辑</a>&nbsp;&nbsp;
                                <a href="{$this->createUrl('category/delete', ['id'=>$v2.id])}"
                                onclick="return confirm('确认删除此分类吗？');return false;">删除</a>
                            </td>
                        </tr>
                        {/foreach}
                    {/foreach}
                {/foreach}
                    <tr>
                        <td></td>
                        <td colspan="4">
                            <input name="submit" type="submit" class="btn button green" value="提交">
                        </td>
                    </tr>
                </tbody>
            </table>
            </form>
        </div>
    </div>

CSS样式

/*Category*/
.category{padding:15px;}
.category .table td{/*font-size:16px;*/ vertical-align:middle;}
.category .table td input{margin-bottom:;}
.category .table .type-child{padding-left:55px;background:url('../../images/bg_repno.gif') no-repeat -248px -550px;}
.category .table .type-child-child{padding-left:105px;background:url('../../images/bg_repno.gif') no-repeat -248px -550px;}

附：bg_repno.gif

$cat_arr 数组结构如图：

最终效果图：

参考文章：

http://www.nowamagic.net/academy/detail/32062016

http://www.helloweba.com/view-blog-204.html

http://blog.csdn.net/liushuai_andy/article/details/7606411