php无限级分类实例

无限分灰一般都会用到递归来实现,下面我们来看看我提供的三个无限分类的读出方法,数据库代码如下:

--  
-- Table structure for table `category`  
--  
CREATE TABLE IF NOT EXISTS `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` (`id`, `catpath`, `name`) VALUES  
(1, '0', '网站首页'),  
(2, '0-1', 'Linux OS'),  
(3, '0-1', 'Apache服务器'),  
(4, '0-1', 'MySQL数据库'),  
(5, '0-1', 'PHP脚本语言'),  
(6, '0-1-2', 'Linux 系统教程'),  
(7, '0-1-2', 'Linux 网络技术'),  
(8, '0-1-2', 'Linux 安全基础'),  
(9, '0-1-2-7', 'Linux LAMP'),  
(10, '0-1-3-10', 'apache Server'); 
php代码:
$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 );  
while ( $row = mysql_fetch_array ( $query ) ) {  
/**  
* 第一种展示方法  
*/  
/*$space = str_repeat ( ' ', count ( explode ( '-', $row ['abspath'] ) ) - 1 );  
echo $space . $row [&#39;name&#39;] . &#39;<br>&#39;;*/  
/**  
* 第二种展示方法  
*/  
$space = str_repeat ( &#39; &#39;, count ( explode ( &#39;-&#39;, $row [&#39;abspath&#39;] ) ) - 1 );  
$option .= &#39;<option value="&#39; . $row [&#39;id&#39;] . &#39;">&#39; . $space . $row [&#39;name&#39;] . &#39;</option>&#39;;  
}  
echo &#39;<select name="opt">&#39; . $option . &#39;</select>&#39;;

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转载随意~请带上教程地址吧^^