php递归实现无限级分类树

时间:2022-10-24 18:00:21

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);
转载自:http://www.php.cn/php-weizijiaocheng-353267.html