php递归实现无限级分类树

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 CREATE TABLE `bg_cate` (
 2 `cate_Id` int(30) unsigned NOT NULL AUTO_INCREMENT,
 3 `cate_ParentId` int(30) unsigned DEFAULT '0',
 4 `cate_Name` varchar(100) NOT NULL,
 5 `cate_Intro` varchar(500) DEFAULT NULL,
 6 `cate_Order` int(30) unsigned DEFAULT '0',
 7 `cate_Icon` varchar(100) DEFAULT NULL,
 8 PRIMARY KEY (`cate_Id`)
 9 ) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=34 ;
10 --
11 -- 导出表中的数据 `bg_cate`
12 --
13 INSERT INTO `bg_cate` (`cate_Id`, `cate_ParentId`, `cate_Name`, `cate_Intro`, `cate_Order`, `cate_Icon`) VALUES
14 (4, 0, '往事如风', '记录往事', 0, 'icons/6.gif'),
15 (5, 0, '水煮三国', '品位三国智慧', 0, 'icons/3.gif'),
16 (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'),
17 (3, 0, '生活点滴', '记录生活点滴', 0, 'icons/2.gif'),
18 (6, 0, '栀子花开', '青春无限', 0, 'icons/8.gif'),
19 (7, 0, '假日休闲', '悠闲、自在', 0, 'icons/24.gif'),
20 (8, 2, 'html', 'html学习', 0, 'icons/1.gif'),
21 (9, 2, 'css', 'css学习', 0, 'icons/1.gif'),
22 (10, 2, 'php', 'php学习', 0, 'icons/18.gif'),
23 (11, 10, 'php基础知识', 'php基础知识', 0, 'icons/1.gif'),
24 (12, 10, 'oop', 'oop', 0, 'icons/1.gif'),
25 (13, 10, 'php安全', '讲述php安全', 0, 'icons/1.gif'),
26 (14, 10, 'seagull framework', 'seagull framework', 0, 'icons/1.gif'),
27 (15, 2, 'javascript', 'javascript学习', 0, 'icons/1.gif'),
28 (16, 2, '设计模式', NULL, 0, 'icons/1.gif'),
29 (17, 2, '软件工程', '软件工程学习', 0, 'icons/1.gif'),
30 (18, 3, '厦门生活', '厦门生活', 0, 'icons/8.gif'),
31 (19, 3, '大学生活', '大学生活', 0, 'icons/8.gif'),
32 (20, 3, '童年生活', '童年生活', 0, 'icons/15.gif'),
33 (21, 19, '学习', '学习', 0, 'icons/1.gif'),
34 (22, 19, '运动', '运动', 0, 'icons/16.gif'),
35 (23, 19, '旅游', '旅游', 0, 'icons/24.gif'),
36 (24, 22, '排球', '排球', 0, 'icons/9.gif'),
37 (25, 22, '篮球', '篮球', 0, 'icons/9.gif'),
38 (26, 22, '羽毛球', '羽毛球', 0, 'icons/9.gif'),
39 (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 require_once './classes/MyDB.php';
2 $con = MyDB::singleton();
3 $sql = <<<SQL
4    select * from bg_cate cate
5 SQL;
6 $data = $con->getAll($sql);
7 //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 Array
 2 (
 3    [0] => Array
 4        (
 5            [cate_Id] => 4
 6            [cate_ParentId] => 0
 7            [cate_Name] => 往事如风
 8            [cate_Intro] => 记录往事
 9            [cate_Order] => 0
10            [cate_Icon] => icons/6.gif
11        )
12    [1] => Array
13        (
14            [cate_Id] => 5
15            [cate_ParentId] => 0
16            [cate_Name] => 水煮三国
17            [cate_Intro] => 品位三国智慧
18            [cate_Order] => 0
19            [cate_Icon] => icons/3.gif
20        )

三.把上一步的数据转为树型状的数组
代码如下:

 1 function getTree($data, $pId)
 2 {
 3 $tree = '';
 4 foreach($data as $k => $v)
 5 {
 6   if($v['cate_ParentId'] == $pId)
 7   {        //父亲找到儿子
 8    $v['cate_ParentId'] = getTree($data, $v['cate_Id']);
 9    $tree[] = $v;
10    //unset($data[$k]);
11   }
12 }
13 return $tree;
14 }
15 $tree = getTree($data, 0);

最后输出$tree的数据格式为:

 1 Array
 2 (
 3    [0] => Array
 4        (
 5            [cate_Id] => 4
 6            [cate_ParentId] =>
 7            [cate_Name] => 往事如风
 8            [cate_Intro] => 记录往事
 9            [cate_Order] => 0
10            [cate_Icon] => icons/6.gif
11        )
12    [1] => Array
13        (
14            [cate_Id] => 5
15            [cate_ParentId] =>
16            [cate_Name] => 水煮三国
17            [cate_Intro] => 品位三国智慧
18            [cate_Order] => 0
19            [cate_Icon] => icons/3.gif
20        )
21    [2] => Array
22        (
23            [cate_Id] => 2
24            [cate_ParentId] => Array
25                (
26                    [0] => Array
27                        (
28                            [cate_Id] => 8
29                            [cate_ParentId] =>
30                            [cate_Name] => html
31                            [cate_Intro] => html学习
32                            [cate_Order] => 0
33                            [cate_Icon] => icons/1.gif
34                        )

四.把树型状数组转为html
代码如下:

 1 function procHtml($tree)
 2 {
 3 $html = '';
 4 foreach($tree as $t)
 5 {
 6   if($t['cate_ParentId'] == '')
 7   {
 8    $html .= "<li>{$t['cate_Name']}</li>";
 9   }
10   else
11   {
12    $html .= "<li>".$t['cate_Name'];
13    $html .= procHtml($t['cate_ParentId']);
14    $html = $html."</li>";
15   }
16 }
17 return $html ? '<ul>'.$html.'</ul>' : $html ;
18 }
19 echo procHtml($tree);

输出的html的代码格式为:

 1 <ul>
 2 <li>往事如风</li>
 3 <li>水煮三国</li>
 4 <li>技术学习
 5   <ul>
 6    <li>html</li>
 7    <li>css</li>
 8    <li>php
 9     <ul>
10      <li>php基础知识</li>
11      <li>oop</li>
12      <li>php安全</li>

五.代码整合

 1 function getTree($data, $pId)
 2 {
 3 $html = '';
 4 foreach($data as $k => $v)
 5 {
 6   if($v['cate_ParentId'] == $pId)
 7   {        //父亲找到儿子
 8    $html .= "<li>".$v['cate_Name'];
 9    $html .= getTree($data, $v['cate_Id']);
10    $html = $html."</li>";
11   }
12 }
13 return $html ? '<ul>'.$html.'</ul>' : $html ;
14 }
15 echo getTree($data, 0);

六.增加CSS样式

第二种是从开源网站上看到的,非常非常的简介。

  1 <?php
  2   
  3 function genTree5($items) {
  4     foreach ($items as $item)
  5         $items[$item['pid']]['son'][$item['id']] = &$items[$item['id']];
  6     return isset($items[0]['son']) ? $items[0]['son'] : array();
  7 }
  8   
  9 /**
 10  * 将数据格式化成树形结构
 11  * @author Xuefen.Tong
 12  * @param array $items
 13  * @return array
 14  */
 15 function genTree9($items) {
 16     $tree = array(); //格式化好的树
 17     foreach ($items as $item)
 18         if (isset($items[$item['pid']]))
 19             $items[$item['pid']]['son'][] = &$items[$item['id']];
 20         else
 21             $tree[] = &$items[$item['id']];
 22     return $tree;
 23 }
 24   
 25 $items = array(
 26     1 => array('id' => 1, 'pid' => 0, 'name' => '江西省'),
 27     2 => array('id' => 2, 'pid' => 0, 'name' => '黑龙江省'),
 28     3 => array('id' => 3, 'pid' => 1, 'name' => '南昌市'),
 29     4 => array('id' => 4, 'pid' => 2, 'name' => '哈尔滨市'),
 30     5 => array('id' => 5, 'pid' => 2, 'name' => '鸡西市'),
 31     6 => array('id' => 6, 'pid' => 4, 'name' => '香坊区'),
 32     7 => array('id' => 7, 'pid' => 4, 'name' => '南岗区'),
 33     8 => array('id' => 8, 'pid' => 6, 'name' => '和兴路'),
 34     9 => array('id' => 9, 'pid' => 7, 'name' => '西大直街'),
 35     10 => array('id' => 10, 'pid' => 8, 'name' => '东北林业大学'),
 36     11 => array('id' => 11, 'pid' => 9, 'name' => '哈尔滨工业大学'),
 37     12 => array('id' => 12, 'pid' => 8, 'name' => '哈尔滨师范大学'),
 38     13 => array('id' => 13, 'pid' => 1, 'name' => '赣州市'),
 39     14 => array('id' => 14, 'pid' => 13, 'name' => '赣县'),
 40     15 => array('id' => 15, 'pid' => 13, 'name' => '于都县'),
 41     16 => array('id' => 16, 'pid' => 14, 'name' => '茅店镇'),
 42     17 => array('id' => 17, 'pid' => 14, 'name' => '大田乡'),
 43     18 => array('id' => 18, 'pid' => 16, 'name' => '义源村'),
 44     19 => array('id' => 19, 'pid' => 16, 'name' => '上坝村'),
 45 );
 46 echo "<pre>";
 47 print_r(genTree5($items));
 48 print_r(genTree9($items));
 49   
 50 //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
 51 /*
 52 Array
 53 (
 54 [0] => Array
 55     (
 56         [id] => 1
 57         [pid] => 0
 58         [name] => 江西省
 59         [son] => Array
 60             (
 61                 [0] => Array
 62                     (
 63                         [id] => 3
 64                         [pid] => 1
 65                         [name] => 南昌市
 66                     )
 67   
 68                 [1] => Array
 69                     (
 70                         [id] => 13
 71                         [pid] => 1
 72                         [name] => 赣州市
 73                         [son] => Array
 74                             (
 75                                 [0] => Array
 76                                     (
 77                                         [id] => 14
 78                                         [pid] => 13
 79                                         [name] => 赣县
 80                                         [son] => Array
 81                                             (
 82                                             [0] => Array
 83                                                 (
 84                                                     [id] => 16
 85                                                     [pid] => 14
 86                                                     [name] => 茅店镇
 87                                                     [son] => Array
 88                                                         (
 89                                                         [0] => Array
 90                                                             (
 91                                                             [id] => 18
 92                                                             [pid] => 16
 93                                                             [name] => 义源村
 94                                                             )
 95   
 96                                                         [1] => Array
 97                                                             (
 98                                                             [id] => 19
 99                                                             [pid] => 16
100                                                             [name] => 上坝村
101                                                             )
102   
103                                                         )
104   
105                                                 )
106   
107                                             [1] => Array
108                                                 (
109                                                     [id] => 17
110                                                     [pid] => 14
111                                                     [name] => 大田乡
112                                                 )
113   
114                                             )
115   
116                                     )
117   
118                                 [1] => Array
119                                     (
120                                         [id] => 15
121                                         [pid] => 13
122                                         [name] => 于都县
123                                     )
124   
125                             )
126   
127                     )
128   
129             )
130   
131     )
132   
133 [1] => Array
134     (
135         [id] => 2
136         [pid] => 0
137         [name] => 黑龙江省
138         [son] => Array
139             (
140                 [0] => Array
141                     (
142                         [id] => 4
143                         [pid] => 2
144                         [name] => 哈尔滨市
145                         [son] => Array
146                             (
147                             [0] => Array
148                                 (
149                                     [id] => 6
150                                     [pid] => 4
151                                     [name] => 香坊区
152                                     [son] => Array
153                                         (
154                                         [0] => Array
155                                             (
156                                                 [id] => 8
157                                                 [pid] => 6
158                                                 [name] => 和兴路
159                                                 [son] => Array
160                                                     (
161                                                         [0] => Array
162                                                             (
163                                                             [id] => 10
164                                                             [pid] => 8
165                                                             [name] =>
166                                                              东北林业大学
167                                                             )
168   
169                                                         [1] => Array
170                                                             (
171                                                             [id] => 12
172                                                             [pid] => 8
173                                                             [name] =>
174                                                             哈尔滨师范大学
175                                                             )
176   
177                                                     )
178   
179                                             )
180   
181                                         )
182   
183                                 )
184   
185                             [1] => Array
186                                 (
187                                     [id] => 7
188                                     [pid] => 4
189                                     [name] => 南岗区
190                                     [son] => Array
191                                         (
192                                         [0] => Array
193                                             (
194                                             [id] => 9
195                                             [pid] => 7
196                                             [name] => 西大直街
197                                             [son] => Array
198                                                 (
199                                                 [0] => Array
200                                                     (
201                                                     [id] => 11
202                                                     [pid] => 9
203                                                     [name] =>
204                                                      哈尔滨工业大学
205                                                     )
206   
207                                                 )
208   
209                                             )
210   
211                                         )
212   
213                                 )
214   
215                             )
216   
217                     )
218   
219                 [1] => Array
220                     (
221                         [id] => 5
222                         [pid] => 2
223                         [name] => 鸡西市
224                     )
225   
226             )
227   
228     )
229 )*/

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

文章转自:http://www.php.cn/php-weizijiaocheng-353267.html

posted @ 2018-01-19 10:39  huohuohiahia  阅读(2855)  评论(0编辑  收藏  举报