<?php
 //计算某个类别所属的类别层数
 function getcatelayer($cateid,$flag=1){
 $cates = M('Gcategory');
 $ini['cate_id'] = $cateid;
 $arr = $cates->where($ini)->find();
 if($arr['parent_id']!=0){
  $flag = getcatelayer($arr['parent_id'],$flag+1);
 }
 return $flag;
 }
 
//类别递归(单层)
function getone($arr,$parent=0,$lev=0){
 //迭代
 $task=array($parent);//任务数组
 $tree=array();//结果数组
 while (!empty($task)){
 $flg=false;
 foreach ($arr as $k=>$v){
  
  if ($v['parent_id']==$parent) {
  $tree[]=array(
   'id'=>$v['cate_id'],
   'name'=>$v['cate_name'],
   'lev'=>$lev
  );
  array_push($task, $v['cate_id']);
  $parent=$v['cate_id'];
  $lev=$lev+1;
  unset($arr[$k]);
  $flg=true;
  }
 
 }
 if ($flg==false) {
  array_pop($task);
  $parent=end($task);
  $lev=$lev-1;
 }
 }
 return $tree;
 
}
//类别递归(多层)
function getCates($arr,$pid=0)
{
 for($i=0; $i<count($arr); $i++){
  if($arr[$i]['parent_id']==$pid){
  $newArr[] = array(
   "id"=>$arr[$i]['cate_id'],
   "name"=>$arr[$i]['cate_name'],
   'son'=>getCates($arr,$arr[$i]['cate_id']),
  );
  }
 }
 return $newArr;
}
 
 
//查询类别所属级
function getlayer($cateid,$flg=1)
{
 $gcg=M("Gcategory");
 $ini["cate_id"]=$cateid;
 $cateArr=$gcg->where($ini)->find();
 if($cateArr['parent_id']!=0)
 {
 $flg=getlayer($cateArr['parent_id'],$flg+1);
 }
 return $flg;
}

<?php
//分类管理
namespace app\admin\Controller;
use think\Db;
use think\Controller;
class CategoryController extends Controller
{ 
 /**
 * 分类列表页(递归)
 */
 public function category_list()
 {
 header('content-type:text/html;charset=utf-8');
 $categoryArr=db::name('表名')->select();
 //调用递归函数
 $getall=getone($categoryArr);
 $this->assign("getall",$getall);
 return $this->fetch()
 }

 <div class="conShow">
        <table border="1" cellspacing="0" cellpadding="0">
          <tr>
            <td width="100px" class="tdColor tdC">id</td>
            <td width="150px" class="tdColor">汽车类型</td>
            <td width="180px" class="tdColor">操作</td>
          </tr>
          {foreach name="getall" id="v"}
          <tr>
            <td>{$v.id}</td>
            <td >{php}echo str_repeat('&nbsp;',$v['lev']*2){/php}|-{$v['name']}</td>
            <td><a href="connoisseuradd.html" rel="external nofollow" ><img class="operation"
                                src="/img/admin/update.png"></a> <img class="operation delban"
                                                   src="/img/admin/delete.png"></td>
          </tr>
          {/foreach}
        </table>
        <div class="paging">此处是分页</div>
      </div>