php创建无限级树型菜单_php技巧

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Release: 2016-05-16 20:05:07
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写递归函数,可考虑缓存,定义一些静态变量来存上一次运行的结果,多程序运行效率很有帮助.。
大概步骤如下
step1:到数据库取数据,放到一个数组,
step2:把数据转化为一个树型状的数组,
step3:把这个树型状的数组转为html代码。
也可以将第二步和第三步合为一步。
详细如下:
1、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');
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2、到数据库取数据,放到数组:

require_once './classes/MyDB.php'; $con = MyDB::singleton(); $sql = <<getAll($sql); //print_r($data);
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数据库操作我用的是pear类库,最后的$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 )
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3、把上一步的数据转为树型状的数组代码如下:

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);
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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 )
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4、把树型状数组转为html代码如下:

function procHtml($tree) { $html = ''; foreach($tree as $t) { if($t['cate_ParentId'] == '') { $html .= "
  • {$t['cate_Name']}
  • "; } else { $html .= "
  • ".$t['cate_Name']; $html .= procHtml($t['cate_ParentId']); $html = $html."
  • "; } } return $html ? '
      '.$html.'
    ' : $html ; } echo procHtml($tree); 输出的html的代码格式为:
    • 往事如风
    • 水煮三国
    • 技术学习
      • html
      • css
      • php
        • php基础知识
        • oop
        • php安全
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    5、也可以把第3和第4步的代码合在一起,代码如下:

    function getTree($data, $pId) { $html = ''; foreach($data as $k => $v) { if($v['cate_ParentId'] == $pId) { //父亲找到儿子 $html .= "
  • ".$v['cate_Name']; $html .= getTree($data, $v['cate_Id']); $html = $html."
  • "; } } return $html ? '
      '.$html.'
    ' : $html ; } echo getTree($data, 0);
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    6、最后再加点css样式,效果如下:

    整个过程思路很清晰,非常适合第一次创建无限级树型的朋友学习,希望大家都有所收获。

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