php递归实现无限级分类

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,找出顶级分类

(2)、对每个顶级分类,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

模型中的操作

 1 <?php
 2 namespace appadminmodel;
 3 use thinkModel;
 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,顶级栏目的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 appadmincontroller;
 3 use thinkController;
 4 use appadminmodelCate as ModelCate;
 5 
 6 use appadmincontrollerBase;
 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

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
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。

1
2
3
4
5
6
7
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:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
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:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
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:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
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:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
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:

1
2
3
4
5
6
7
8
9
10
11
12
<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

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
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

884370dfhc28075550cfd&690.jpg


第二种是从开源网站上看到的,非常非常的简介。

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
<?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。

原文地址:https://www.cnblogs.com/Renyi-Fan/p/8858329.html