php递归无限级

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;
}
$data=Db::table("bg_cate")->select();
$tree = getTree($data, 0);
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);

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\');

 

CREATE TABLE IF NOT EXISTS `class` (
  `id` mediumint(6) NOT NULL AUTO_INCREMENT,
  `title` varchar(30) NOT NULL,
  `pid` mediumint(6) NOT NULL DEFAULT \'0\',
  PRIMARY KEY (`id`)
) ENGINE=MyISAM  DEFAULT CHARSET=utf8;