PHP无限级分类实现。。。。。。
1，数据库设计：
2，代码：
/** * @author koma * @todo PHP无限极分类 */$cn = mysql_connect('localhost', 'root', '') or die(mysql_error());mysql_select_db('t', $cn) or die(mysql_error());mysql_query('set names utf8');/** * 从顶层逐级向下获取子类 * @param number $pid * @param array $lists * @param number $deep * @return array */function getLists($pid = 0, &$lists = array(), $deep = 1) { $sql = 'SELECT * FROM category WHERE pid='.$pid; $res = mysql_query($sql); while ( ($row = mysql_fetch_assoc($res)) !== FALSE ) { $row['catename'] = str_repeat(' ', $deep).'|---'.$row['catename']; $lists[] = $row; getLists($row['id'], $lists, ++$deep); //进入子类之前深度+1 --$deep; //从子类退出之后深度-1 } return $lists;}function displayLists($pid = 0, $selectid = 1) { $result = getLists($pid); $str = '';}/** * 从子类开始逐级向上获取其父类 * @param number $cid * @param array $category * @return array: */function getCategory($cid, &$category = array()) { $sql = 'SELECT * FROM category WHERE id='.$cid.' LIMIT 1'; $result = mysql_query($sql); $row = mysql_fetch_assoc($result); if ( $row ) { $category[] = $row; getCategory($row['pid'], $category); } krsort($category); //逆序,达到从父类到子类的效果 return $category;}function displayCategory($cid) { $result = getCategory($cid); $str = ""; foreach ( $result as $item ) { $str .= ' '.$item['catename'].'>'; } return substr($str, 0, strlen($str) - 1);}echo displayLists(0, 3);echo displayCategory(13); 3，效果图：
