laravel 分类deno

/**
 * 产品分类获取子节点
 * @param  array  $data [description]
 * @return [type]       [description]
 */
function get_childer_node($data = [])
{
    // 记录该分类的深度
    static $callNum = 1;
    $fg = str_repeat('|----',$callNum); 
    if(empty($data)) {
        return;        
    }
    foreach ($data as $key => $vo) {
        $url = url("admin/category_edit?id={$vo['id']}");
        
        echo "
                <tr>
                    <td>{$vo['id']}</td>
                    <td>{$vo['pid']}</td>
                    <td>{$fg}{$vo['name']}</td>
                    <td><image src='{$vo["thumb"]}' /></td>
                    <td>{$vo['sort']}</td>
                    <td>{$vo['status']}</td>
                    <td> <button class='layui-btn  layui-btn-danger layui-btn-sm' href='#'>属性</button> <button class='layui-btn layui-btn-sm' onclick='mcAdminShow('编辑','http://www.baidu.com')'>编辑</button><button class='layui-btn layui-btn-sm' >删除</button></td>
                </tr>
            ";
        // 如果该分类的依旧有子分类则再次遍历输出 
        if(!empty($vo ['childer'])) {
            $callNum ++;
            get_childer_node($vo ['childer']);
        }
        // 重置分类层级
        $callNum = 1;
    }
}



    /**
     * 加载视图
     * @return [type] [description]
     */
    public function category()
    {    
      $pid = \Request::get('pid');
      //查询数据
      if(empty($pid)){
        $list = \App\Categorys::orderBy('sort','desc')->get();
        $pid=0;
      }else{
        $list = \App\Categorys::where("pid",$pid)->orderBy('sort','desc')->get();
      }
        // 将分类以及子分类整理排序
      $list = $this->_treeNode($list->toArray(),$pid);
      // echo "<pre>";
      // var_dump($goods_group);die;
        // 加载视图及分配数据
      return view("admin/posts/category",compact('list'));      
    }

    /**
     * 整理排序所有分类
     * @param  array   $data       从数据库获取的分类
     * @param  integer $parentId 父id,默认一级分类
     * @return array 
     */
    private function _treeNode($data,$parentId = 0)
    {
        // 用于保存整理好的分类节点
        $node = [];
        // 循环所有分类
        foreach ($data as $key => $value) {
            // 如果当前分类的父id等于要寻找的父id则写入$node数组,并寻找当前分类id下的所有子分类
            if($parentId == $value ['pid']) {
                $node [$key] = $value;
                $node [$key] ['childer'] = $this->_treeNode($data,$value ['id']);
            }
        }
        return $node;
    }  



<table class="layui-table">
  <colgroup>
    <col width="30">
    <col width="30">
    <col width="50">
    <!-- <col width="60"> -->
    <col width="60">
    <col width="60">
    <col width="50">
    <col width="120">
    <col>
  </colgroup>
  <thead>
    <tr>
      <th>ID</th>
      <th>父级</th>
      <th>分类名称</th>
      <!-- <th>查看子类</th> -->
      <th>缩略图</th>
      <th>排序</th> 
      <th>状态</th>
      <th>操作</th>
    </tr> 
  </thead>
  <tbody>
    @foreach($list as $k=>$vo)
      <tr>
        <td>{{$vo['id']}}</td>
        <td>{{$vo['pid']}}</td>
        <td>{{$vo['name']}}</td>
        <!-- <td><a href="{{asset("admin/category?pid=".$vo['id'])}}">查看字类</a></td> -->
        <td><image src="{{$vo['thumb']}}" /></td>
        <td>{{$vo['sort']}}</td>
        <td>{{$vo['status']}}</td>
        <td> 
          <button class="layui-btn layui-btn-sm" onclick='mcAdminShow("编辑文章","{{asset('admin/category_edit?id='.$vo['id'])}}")'>编辑</button>
            
        </td>
      </tr>
      @if(!empty($vo['childer']))
        {{get_childer_node($vo['childer'])}}
      @endif
    @endforeach
  </tbody>
</table>