php无限极分类
php无限极分类
php无限极分类是经常要用到的,本人以前一直用的是已经写好的,所以没仔细去研究过,今天由于项目的需要,需要临时做一个php无限极分类的东东,遂做了一个最简单的,现记录如下,有需要的朋友可以看下。
数据表结构
CREATE TABLE IF NOT EXISTS `category` ( `id` int(5) NOT NULL AUTO_INCREMENT COMMENT '唯一自增id', `pid` int(5) NOT NULL DEFAULT '0' COMMENT '父id', `sort` int(2) NOT NULL DEFAULT '0' COMMENT '排序数字', `name` varchar(30) DEFAULT NULL COMMENT '名称', PRIMARY KEY (`id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8 COMMENT='无限极分类表' AUTO_INCREMENT=1 ;
数据
INSERT INTO `category` (`id`, `pid`, `sort`, `name`) VALUES (1, 0, 1, 'php'), (2, 0, 2, '数据库'), (3, 0, 3, 'javascript'), (4, 1, 1, '框架模板'), (5, 1, 2, '函数总结'), (6, 2, 1, 'mysql'), (7, 4, 1, '框架'), (8, 4, 2, '模板'), (9, 8, 1, 'smarty'), (10, 7, 2, 'thinkphp'), (11, 10, 1, 'thinkphp技巧'), (12, 10, 2, 'thinkphp模板'), (13, 12, 3, '模板知识总结'), (14, 12, 2, '模板视频教程'), (15, 11, 1, 'model技巧');
函数实现代码
function tree(&$list,$pid=0,$level=0,$html='--'){ static $tree=array(); foreach($list as $v){ if($v['pid']==$pid){ $v['level']=$level; $v['html']=str_repeat($html,$level); $tree[]=$v; tree($list,$v['id'],$level+1,$html); } } return $tree; }
以上tree函数的第一个参数$list就是获取的如上表的一个二维数组的结果集。需要注意的是从数据库获取结果集的sql语句必须加上order by sort asc,否则sort字段将不能发挥排序的作用。
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