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php递归实现无限级分类树

大家讲道理
大家讲道理asal
2017-05-18 18:09:3123146semak imbas

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

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。

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:

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:

function getTree($data, $pId)
{
$tree = &#39;&#39;;
foreach($data as $k => $v)
{
  if($v[&#39;cate_ParentId&#39;] == $pId)
  {        //父亲找到儿子
   $v[&#39;cate_ParentId&#39;] = getTree($data, $v[&#39;cate_Id&#39;]);
   $tree[] = $v;
   //unset($data[$k]);
  }
}
return $tree;
}
$tree = getTree($data, 0);

最后输出$tree的数据格式为:

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:

function procHtml($tree)
{
$html = &#39;&#39;;
foreach($tree as $t)
{
  if($t[&#39;cate_ParentId&#39;] == &#39;&#39;)
  {
   $html .= "<li>{$t[&#39;cate_Name&#39;]}</li>";
  }
  else
  {
   $html .= "<li>".$t[&#39;cate_Name&#39;];
   $html .= procHtml($t[&#39;cate_ParentId&#39;]);
   $html = $html."</li>";
  }
}
return $html ? &#39;<ul>&#39;.$html.&#39;</ul>&#39; : $html ;
}
echo procHtml($tree);

输出的html的代码格式为:

<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

function getTree($data, $pId)
{
$html = &#39;&#39;;
foreach($data as $k => $v)
{
  if($v[&#39;cate_ParentId&#39;] == $pId)
  {        //父亲找到儿子
   $html .= "<li>".$v[&#39;cate_Name&#39;];
   $html .= getTree($data, $v[&#39;cate_Id&#39;]);
   $html = $html."</li>";
  }
}
return $html ? &#39;<ul>&#39;.$html.&#39;</ul>&#39; : $html ;
}
echo getTree($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。

<?php
 
function genTree5($items) { 
    foreach ($items as $item) 
        $items[$item[&#39;pid&#39;]][&#39;son&#39;][$item[&#39;id&#39;]] = &$items[$item[&#39;id&#39;]]; 
    return isset($items[0][&#39;son&#39;]) ? $items[0][&#39;son&#39;] : 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[&#39;pid&#39;]]))
            $items[$item[&#39;pid&#39;]][&#39;son&#39;][] = &$items[$item[&#39;id&#39;]];
        else
            $tree[] = &$items[$item[&#39;id&#39;]];
    return $tree;
}
 
$items = array(
    1 => array(&#39;id&#39; => 1, &#39;pid&#39; => 0, &#39;name&#39; => &#39;江西省&#39;),
    2 => array(&#39;id&#39; => 2, &#39;pid&#39; => 0, &#39;name&#39; => &#39;黑龙江省&#39;),
    3 => array(&#39;id&#39; => 3, &#39;pid&#39; => 1, &#39;name&#39; => &#39;南昌市&#39;),
    4 => array(&#39;id&#39; => 4, &#39;pid&#39; => 2, &#39;name&#39; => &#39;哈尔滨市&#39;),
    5 => array(&#39;id&#39; => 5, &#39;pid&#39; => 2, &#39;name&#39; => &#39;鸡西市&#39;),
    6 => array(&#39;id&#39; => 6, &#39;pid&#39; => 4, &#39;name&#39; => &#39;香坊区&#39;),
    7 => array(&#39;id&#39; => 7, &#39;pid&#39; => 4, &#39;name&#39; => &#39;南岗区&#39;),
    8 => array(&#39;id&#39; => 8, &#39;pid&#39; => 6, &#39;name&#39; => &#39;和兴路&#39;),
    9 => array(&#39;id&#39; => 9, &#39;pid&#39; => 7, &#39;name&#39; => &#39;西大直街&#39;),
    10 => array(&#39;id&#39; => 10, &#39;pid&#39; => 8, &#39;name&#39; => &#39;东北林业大学&#39;),
    11 => array(&#39;id&#39; => 11, &#39;pid&#39; => 9, &#39;name&#39; => &#39;哈尔滨工业大学&#39;),
    12 => array(&#39;id&#39; => 12, &#39;pid&#39; => 8, &#39;name&#39; => &#39;哈尔滨师范大学&#39;),
    13 => array(&#39;id&#39; => 13, &#39;pid&#39; => 1, &#39;name&#39; => &#39;赣州市&#39;),
    14 => array(&#39;id&#39; => 14, &#39;pid&#39; => 13, &#39;name&#39; => &#39;赣县&#39;),
    15 => array(&#39;id&#39; => 15, &#39;pid&#39; => 13, &#39;name&#39; => &#39;于都县&#39;),
    16 => array(&#39;id&#39; => 16, &#39;pid&#39; => 14, &#39;name&#39; => &#39;茅店镇&#39;),
    17 => array(&#39;id&#39; => 17, &#39;pid&#39; => 14, &#39;name&#39; => &#39;大田乡&#39;),
    18 => array(&#39;id&#39; => 18, &#39;pid&#39; => 16, &#39;name&#39; => &#39;义源村&#39;),
    19 => array(&#39;id&#39; => 19, &#39;pid&#39; => 16, &#39;name&#39; => &#39;上坝村&#39;),
);
echo "<pre class="brush:php;toolbar:false">";
print_r(genTree5($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。

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