php递归实现无限级分类

时间:2021-12-29 08:06:32

php递归实现无限级分类

本文给出了一种自己的无线分类的写法,和两种别人的无限分类的写法

自己写法

0、算法思路

假设$data数组为栏目数据的存储数组,思路:

(1)、遍历$data数组,找出*分类

(2)、对每个*分类,去在$data数组中遍历递归一级一级的找到每个它的孩子,通过$data数组结构里面存的父级id(pid)来查找

学过算法的会发现,这是最基础最基础的递归算法,我的代码直接是最基础的,也没有加上优化

 

1、效果

php递归实现无限级分类

 

模型中的操作

 1 <?php
 2 namespace app\admin\model;
 3 use think\Model;
 4 
 5 class Cate extends Model
 6 {
 7     //处理栏目cate无线分类
 8     public function catetree(){
 9         //获取栏目数据
10         $cateres=$this->select();
11         $res=$this->sort($cateres);
12         // dump($res);die;
13         return $res;
14     }
15 
16     /**
17      * 无线分类重新排序:使得那些栏目的顺序是对的,父级栏目在子级标题之上
18      * 这其实是一个再简单的递归也没有了,作为递归,访问标签页没有加
19      * @param  [type]  $data  传入的栏目数组
20      * @param  integer $pid   父级栏目id,*栏目的id为0
21      * @param  integer $level 栏目等级,初始等级为0
22      * @return [type]         排序好的栏目的数据
23      */
24     public function sort($data,$pid=0,$level=0){
25         static $arr=array();
26         foreach ($data as $k => $v) {
27             //如果子级的父级id等于传传过来要查找的父级id,说明自己是这个父级id的孩子
28             if($v['pid']==$pid){
29                 $v['level']=$level;
30                 $arr[]=$v;
31                 //在这个$data数组中去递归找它的孩子
32                 $this->sort($data,$v['id'],$level+1); 33             }
34         }
35         return $arr;
36     }
37 }

 

控制器中掉用模型数据的操作

 1 <?php
 2 namespace app\admin\controller;
 3 use think\Controller;
 4 use app\admin\model\Cate as ModelCate;
 5 
 6 use app\admin\controller\Base;
 7 
 8 class Cate extends Base
 9 {
10     //列表页
11     public function lst()
12     {
13         //catetree方法新增了栏目的level字段
14         $modelCate=new ModelCate();
15         $data=$modelCate->catetree(); 16         $this->assign('data',$data);
17         return view('list');
18     }

 

视图操作

 1 <table class="table table-bordered table-hover">
 2     <thead class="">
 3         <tr>
 4             <th class="text-center" width="10%">栏目ID</th>
 5             <th class="text-center">栏目名称</th>
 6             <th class="text-center">栏目类型</th>
 7             <th class="text-center">栏目上级id</th>
 8             <th class="text-center" width="20%">操作</th>
 9         </tr>
10     </thead>
11     <tbody>
12         {volist name="data" id="vo"}
13         <tr>
14             <td align="center">{$vo.id}</td>
15             <td >{if condition="$vo.level neq 0"}|{/if}<?php echo str_repeat('----',$vo['level'])?>{$vo.catename}</td>
16             <td align="center">
17                 {if condition="$vo['type'] eq 1"}
18                 列表
19                 {else /}
20                 单页
21                 {/if}
22             </td>
23             <td align="center">{$vo.pid}</td>
24             <td align="center">
25                 <a href="{:url('cate/edit',array('id'=>$vo['id']))}" class="btn btn-primary btn-sm shiny">
26                     <i class="fa fa-edit"></i> 编辑
27                 </a>
28                 <a href="#" onClick="warning('确实要删除吗', '{:url('cate/delete',array('id'=>$vo['id']))}')" class="btn btn-danger btn-sm shiny">
29                     <i class="fa fa-trash-o"></i> 删除
30                 </a>
31             </td>
32         </tr>
33         {/volist}
34 
35 
36     </tbody>
37 
38 </table>

 

 

两种别人的写法

 

无限级树状图可以说是无限级栏目的一个显著特征,我们接下来就来看看两种不同的写法。

 

一.数据库设计

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CREATE  TABLE  `bg_cate` (
`cate_Id`  int (30) unsigned  NOT  NULL  AUTO_INCREMENT,
`cate_ParentId`  int (30) unsigned  DEFAULT  '0' ,
`cate_Name`  varchar (100)  NOT  NULL ,
`cate_Intro`  varchar (500)  DEFAULT  NULL ,
`cate_Order`  int (30) unsigned  DEFAULT  '0' ,
`cate_Icon`  varchar (100)  DEFAULT  NULL ,
PRIMARY  KEY  (`cate_Id`)
) ENGINE=MyISAM  DEFAULT  CHARSET=utf8 AUTO_INCREMENT=34 ;
--
-- 导出表中的数据 `bg_cate`
--
INSERT  INTO  `bg_cate` (`cate_Id`, `cate_ParentId`, `cate_Name`, `cate_Intro`, `cate_Order`, `cate_Icon`)  VALUES
(4, 0,  '往事如风' '记录往事' , 0,  'icons/6.gif' ),
(5, 0,  '水煮三国' '品位三国智慧' , 0,  'icons/3.gif' ),
(2, 0,  '技术学习' '平时学习的一些笔记,欢迎批评指正。' , 0,  'icons/18.gif' ),
(3, 0,  '生活点滴' '记录生活点滴' , 0,  'icons/2.gif' ),
(6, 0,  '栀子花开' '青春无限' , 0,  'icons/8.gif' ),
(7, 0,  '假日休闲' '悠闲、自在' , 0,  'icons/24.gif' ),
(8, 2,  'html' 'html学习' , 0,  'icons/1.gif' ),
(9, 2,  'css' 'css学习' , 0,  'icons/1.gif' ),
(10, 2,  'php' 'php学习' , 0,  'icons/18.gif' ),
(11, 10,  'php基础知识' 'php基础知识' , 0,  'icons/1.gif' ),
(12, 10,  'oop' 'oop' , 0,  'icons/1.gif' ),
(13, 10,  'php安全' '讲述php安全' , 0,  'icons/1.gif' ),
(14, 10,  'seagull framework' 'seagull framework' , 0,  'icons/1.gif' ),
(15, 2,  'javascript' 'javascript学习' , 0,  'icons/1.gif' ),
(16, 2,  '设计模式' NULL , 0,  'icons/1.gif' ),
(17, 2,  '软件工程' '软件工程学习' , 0,  'icons/1.gif' ),
(18, 3,  '厦门生活' '厦门生活' , 0,  'icons/8.gif' ),
(19, 3,  '大学生活' '大学生活' , 0,  'icons/8.gif' ),
(20, 3,  '童年生活' '童年生活' , 0,  'icons/15.gif' ),
(21, 19,  '学习' '学习' , 0,  'icons/1.gif' ),
(22, 19,  '运动' '运动' , 0,  'icons/16.gif' ),
(23, 19,  '旅游' '旅游' , 0,  'icons/24.gif' ),
(24, 22,  '排球' '排球' , 0,  'icons/9.gif' ),
(25, 22,  '篮球' '篮球' , 0,  'icons/9.gif' ),
(26, 22,  '羽毛球' '羽毛球' , 0,  'icons/9.gif' ),
(27, 22,  '乒乓球' '乒乓球' , 0,  'icons/9.gif' );

二.到数据库取数据,放到数组。

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require_once  './classes/MyDB.php' ;
$con = MyDB::singleton();
$sql = <<<SQL
    select  from  bg_cate cate
SQL;
$data = $con->getAll($sql);
//print_r($data);

数据库操作我用的是pear类库。
最后的$data的数据格式如下:

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Array
(
    [0] => Array
        (
            [cate_Id] => 4
            [cate_ParentId] => 0
            [cate_Name] => 往事如风
            [cate_Intro] => 记录往事
            [cate_Order] => 0
            [cate_Icon] => icons/6.gif
        )
    [1] => Array
        (
            [cate_Id] => 5
            [cate_ParentId] => 0
            [cate_Name] => 水煮三国
            [cate_Intro] => 品位三国智慧
            [cate_Order] => 0
            [cate_Icon] => icons/3.gif
        )

三.把上一步的数据转为树型状的数组
代码如下:

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function  getTree( $data $pId )
{
$tree  '' ;
foreach ( $data  as  $k  =>  $v )
{
   if ( $v [ 'cate_ParentId' ] ==  $pId )
   {         //父亲找到儿子
    $v [ 'cate_ParentId' ] = getTree( $data $v [ 'cate_Id' ]);
    $tree [] =  $v ;
    //unset($data[$k]);
   }
}
return  $tree ;
}
$tree  = getTree( $data , 0);

最后输出$tree的数据格式为:

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Array
(
    [0] => Array
        (
            [cate_Id] => 4
            [cate_ParentId] =>
            [cate_Name] => 往事如风
            [cate_Intro] => 记录往事
            [cate_Order] => 0
            [cate_Icon] => icons/6.gif
        )
    [1] => Array
        (
            [cate_Id] => 5
            [cate_ParentId] =>
            [cate_Name] => 水煮三国
            [cate_Intro] => 品位三国智慧
            [cate_Order] => 0
            [cate_Icon] => icons/3.gif
        )
    [2] => Array
        (
            [cate_Id] => 2
            [cate_ParentId] => Array
                (
                    [0] => Array
                        (
                            [cate_Id] => 8
                            [cate_ParentId] =>
                            [cate_Name] => html
                            [cate_Intro] => html学习
                            [cate_Order] => 0
                            [cate_Icon] => icons/1.gif
                        )

四.把树型状数组转为html
代码如下:

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function  procHtml( $tree )
{
$html  '' ;
foreach ( $tree  as  $t )
{
   if ( $t [ 'cate_ParentId' ] ==  '' )
   {
    $html  .=  "<li>{$t['cate_Name']}</li>" ;
   }
   else
   {
    $html  .=  "<li>" . $t [ 'cate_Name' ];
    $html  .= procHtml( $t [ 'cate_ParentId' ]);
    $html  $html . "</li>" ;
   }
}
return  $html  '<ul>' . $html . '</ul>'  $html  ;
}
echo  procHtml( $tree );

输出的html的代码格式为:

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< ul >
< li >往事如风</ li >
< li >水煮三国</ li >
< li >技术学习
   < ul >
    < li >html</ li >
    < li >css</ li >
    < li >php
     < ul >
      < li >php基础知识</ li >
      < li >oop</ li >
      < li >php安全</ li >

五.代码整合

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function  getTree( $data $pId )
{
$html  '' ;
foreach ( $data  as  $k  =>  $v )
{
   if ( $v [ 'cate_ParentId' ] ==  $pId )
   {         //父亲找到儿子
    $html  .=  "<li>" . $v [ 'cate_Name' ];
    $html  .= getTree( $data $v [ 'cate_Id' ]);
    $html  $html . "</li>" ;
   }
}
return  $html  '<ul>' . $html . '</ul>'  $html  ;
}
echo  getTree( $data , 0);

六.增加CSS样式

php递归实现无限级分类


第二种是从开源网站上看到的,非常非常的简介。

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<?php
  
function  genTree5( $items ) {
     foreach  ( $items  as  $item )
         $items [ $item [ 'pid' ]][ 'son' ][ $item [ 'id' ]] = & $items [ $item [ 'id' ]];
     return  isset( $items [0][ 'son' ]) ?  $items [0][ 'son' ] :  array ();
}
  
/**
  * 将数据格式化成树形结构
  * @author Xuefen.Tong
  * @param array $items
  * @return array
  */
function  genTree9( $items ) {
     $tree  array ();  //格式化好的树
     foreach  ( $items  as  $item )
         if  (isset( $items [ $item [ 'pid' ]]))
             $items [ $item [ 'pid' ]][ 'son' ][] = & $items [ $item [ 'id' ]];
         else
             $tree [] = & $items [ $item [ 'id' ]];
     return  $tree ;
}
  
$items  array (
     1 =>  array ( 'id'  => 1,  'pid'  => 0,  'name'  =>  '江西省' ),
     2 =>  array ( 'id'  => 2,  'pid'  => 0,  'name'  =>  '黑龙江省' ),
     3 =>  array ( 'id'  => 3,  'pid'  => 1,  'name'  =>  '南昌市' ),
     4 =>  array ( 'id'  => 4,  'pid'  => 2,  'name'  =>  '哈尔滨市' ),
     5 =>  array ( 'id'  => 5,  'pid'  => 2,  'name'  =>  '鸡西市' ),
     6 =>  array ( 'id'  => 6,  'pid'  => 4,  'name'  =>  '香坊区' ),
     7 =>  array ( 'id'  => 7,  'pid'  => 4,  'name'  =>  '南岗区' ),
     8 =>  array ( 'id'  => 8,  'pid'  => 6,  'name'  =>  '和兴路' ),
     9 =>  array ( 'id'  => 9,  'pid'  => 7,  'name'  =>  '西大直街' ),
     10 =>  array ( 'id'  => 10,  'pid'  => 8,  'name'  =>  '东北林业大学' ),
     11 =>  array ( 'id'  => 11,  'pid'  => 9,  'name'  =>  '哈尔滨工业大学' ),
     12 =>  array ( 'id'  => 12,  'pid'  => 8,  'name'  =>  '哈尔滨师范大学' ),
     13 =>  array ( 'id'  => 13,  'pid'  => 1,  'name'  =>  '赣州市' ),
     14 =>  array ( 'id'  => 14,  'pid'  => 13,  'name'  =>  '赣县' ),
     15 =>  array ( 'id'  => 15,  'pid'  => 13,  'name'  =>  '于都县' ),
     16 =>  array ( 'id'  => 16,  'pid'  => 14,  'name'  =>  '茅店镇' ),
     17 =>  array ( 'id'  => 17,  'pid'  => 14,  'name'  =>  '大田乡' ),
     18 =>  array ( 'id'  => 18,  'pid'  => 16,  'name'  =>  '义源村' ),
     19 =>  array ( 'id'  => 19,  'pid'  => 16,  'name'  =>  '上坝村' ),
);
echo  "<pre>" ;
print_r(genTree5( $items ));
print_r(genTree9( $items ));
  
//后者输出格式,前者类似,只是数组键值不一样,不过不影响数据结构
/*
Array
(
[0] => Array
     (
         [id] => 1
         [pid] => 0
         [name] => 江西省
         [son] => Array
             (
                 [0] => Array
                     (
                         [id] => 3
                         [pid] => 1
                         [name] => 南昌市
                     )
  
                 [1] => Array
                     (
                         [id] => 13
                         [pid] => 1
                         [name] => 赣州市
                         [son] => Array
                             (
                                 [0] => Array
                                     (
                                         [id] => 14
                                         [pid] => 13
                                         [name] => 赣县
                                         [son] => Array
                                             (
                                             [0] => Array
                                                 (
                                                     [id] => 16
                                                     [pid] => 14
                                                     [name] => 茅店镇
                                                     [son] => Array
                                                         (
                                                         [0] => Array
                                                             (
                                                             [id] => 18
                                                             [pid] => 16
                                                             [name] => 义源村
                                                             )
  
                                                         [1] => Array
                                                             (
                                                             [id] => 19
                                                             [pid] => 16
                                                             [name] => 上坝村
                                                             )
  
                                                         )
  
                                                 )
  
                                             [1] => Array
                                                 (
                                                     [id] => 17
                                                     [pid] => 14
                                                     [name] => 大田乡
                                                 )
  
                                             )
  
                                     )
  
                                 [1] => Array
                                     (
                                         [id] => 15
                                         [pid] => 13
                                         [name] => 于都县
                                     )
  
                             )
  
                     )
  
             )
  
     )
  
[1] => Array
     (
         [id] => 2
         [pid] => 0
         [name] => 黑龙江省
         [son] => Array
             (
                 [0] => Array
                     (
                         [id] => 4
                         [pid] => 2
                         [name] => 哈尔滨市
                         [son] => Array
                             (
                             [0] => Array
                                 (
                                     [id] => 6
                                     [pid] => 4
                                     [name] => 香坊区
                                     [son] => Array
                                         (
                                         [0] => Array
                                             (
                                                 [id] => 8
                                                 [pid] => 6
                                                 [name] => 和兴路
                                                 [son] => Array
                                                     (
                                                         [0] => Array
                                                             (
                                                             [id] => 10
                                                             [pid] => 8
                                                             [name] =>
                                                              东北林业大学
                                                             )
  
                                                         [1] => Array
                                                             (
                                                             [id] => 12
                                                             [pid] => 8
                                                             [name] =>
                                                             哈尔滨师范大学
                                                             )
  
                                                     )
  
                                             )
  
                                         )
  
                                 )
  
                             [1] => Array
                                 (
                                     [id] => 7
                                     [pid] => 4
                                     [name] => 南岗区
                                     [son] => Array
                                         (
                                         [0] => Array
                                             (
                                             [id] => 9
                                             [pid] => 7
                                             [name] => 西大直街
                                             [son] => Array
                                                 (
                                                 [0] => Array
                                                     (
                                                     [id] => 11
                                                     [pid] => 9
                                                     [name] =>
                                                      哈尔滨工业大学
                                                     )
  
                                                 )
  
                                             )
  
                                         )
  
                                 )
  
                             )
  
                     )
  
                 [1] => Array
                     (
                         [id] => 5
                         [pid] => 2
                         [name] => 鸡西市
                     )
  
             )
  
     )
)*/

可以看出第二种代码只用了5行代码就实现了无限级的分类树,非常值得大家的借鉴和学习。