比起以前的递归函数,使用mysql的contact函数非常方便的实现了php的无限分类
-- -- Table structure for table `category` -- CREATE TABLE `category` ( `id` int(11) NOT NULL auto_increment, `catpath` varchar(255) default NULL, `name` varchar(255) default NULL, PRIMARY KEY (`id`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8 AUTO_INCREMENT=11 ; -- -- Dumping data for table `category` -- INSERT INTO `category` VALUES (1, '0', '网站首页'); INSERT INTO `category` VALUES (2, '0-1', 'Linux OS'); INSERT INTO `category` VALUES (3, '0-1', 'Apache服务器'); INSERT INTO `category` VALUES (4, '0-1', 'MySQL数据库'); INSERT INTO `category` VALUES (5, '0-1', 'PHP脚本语言'); INSERT INTO `category` VALUES (6, '0-1-2', 'Linux 系统教程'); INSERT INTO `category` VALUES (7, '0-1-2', 'Linux 网络技术'); INSERT INTO `category` VALUES (8, '0-1-2', 'Linux 安全基础'); INSERT INTO `category` VALUES (9, '0-1-2-7', 'Linux LAMP'); INSERT INTO `category` VALUES (10, '0-1-3-10', 'apache Server');
php代码如下
<?php header("Content-Type: text/html; charset=UTF-8"); /** * 通用的树型类,可以生成任何树型结构 */ $conn = mysql_connect('localhost', 'root', ''); mysql_select_db('test', $conn); mysql_query('set names UTF8'); $sql = "select id,concat(catpath,'-',id) as abspath,name from category order by abspath"; $query = mysql_query($sql); $option = ''; while ($row = mysql_fetch_array($query)) { /** * 第一种展示方法 $space = str_repeat ( ' ', count ( explode ( '-', $row ['abspath'] ) ) - 1 ); echo $space . $row ['name'] . '<br>'; /** * 第二种展示方法 */ $space = str_repeat(' ', count(explode('-', $row['abspath'])) - 1); $option .= '<option value="' . $row['id'] . '">' . $space . $row['name'] . '</option>'; } echo '<select name="opt">' . $option . '</select>';?>