无限级树状图可以说是无限级栏目的一个显著特征，我们接下来就来看看两种不同的写法。
一.数据库设计
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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'); |
二.到数据库取数据，放到数组。
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require_once './classes/MyDB.php';$con = MyDB::singleton();$sql = <<<SQL select * from bg_cate cateSQL;$data = $con->getAll($sql);//print_r($data); |
数据库操作我用的是pear类库。
最后的$data的数据格式如下：
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Array( [0] => Array ( [cate_Id] => 4 [cate_ParentId] => 0 [cate_Name] => 往事如风 [cate_Intro] => 记录往事 [cate_Order] => 0 [cate_Icon] => icons/6.gif ) [1] => Array ( [cate_Id] => 5 [cate_ParentId] => 0 [cate_Name] => 水煮三国 [cate_Intro] => 品位三国智慧 [cate_Order] => 0 [cate_Icon] => icons/3.gif ) |
三.把上一步的数据转为树型状的数组
代码如下：
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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 $tree;}$tree = getTree($data, 0); |
最后输出$tree的数据格式为：
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Array( [0] => Array ( [cate_Id] => 4 [cate_ParentId] => [cate_Name] => 往事如风 [cate_Intro] => 记录往事 [cate_Order] => 0 [cate_Icon] => icons/6.gif ) [1] => Array ( [cate_Id] => 5 [cate_ParentId] => [cate_Name] => 水煮三国 [cate_Intro] => 品位三国智慧 [cate_Order] => 0 [cate_Icon] => icons/3.gif ) [2] => Array ( [cate_Id] => 2 [cate_ParentId] => Array ( [0] => Array ( [cate_Id] => 8 [cate_ParentId] => [cate_Name] => html [cate_Intro] => html学习 [cate_Order] => 0 [cate_Icon] => icons/1.gif ) |
四.把树型状数组转为html
代码如下：
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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); |
输出的html的代码格式为：
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<ul><li>往事如风</li><li>水煮三国</li><li>技术学习 <ul> <li>html</li> <li>css</li> <li>php <ul> <li>php基础知识</li> <li>oop</li> <li>php安全</li> |
五.代码整合
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function getTree($data, $pId){$html = '';foreach($data as $k => $v){ if($v['cate_ParentId'] == $pId) { //父亲找到儿子 $html .= "<li>".$v['cate_Name']; $html .= getTree($data, $v['cate_Id']); $html = $html."</li>"; }}return $html ? '<ul>'.$html.'</ul>' : $html ;}echo getTree($data, 0); |
六.增加CSS样式
第二种是从开源网站上看到的，非常非常的简洁：
<?php function genTree5($items) { foreach ($items as $item) $items[$item['pid']]['son'][$item['id']] = &$items[$item['id']]; return isset($items[0]['son']) ? $items[0]['son'] : array(); } /** * 将数据格式化成树形结构 * @author Xuefen.Tong * @param array $items * @return array */ function genTree9($items) { $tree = array(); //格式化好的树 foreach ($items as $item) if (isset($items[$item['pid']])) $items[$item['pid']]['son'][] = &$items[$item['id']]; else $tree[] = &$items[$item['id']]; return $tree; } $items = array( 1 => array('id' => 1, 'pid' => 0, 'name' => '江西省'), 2 => array('id' => 2, 'pid' => 0, 'name' => '黑龙江省'), 3 => array('id' => 3, 'pid' => 1, 'name' => '南昌市'), 4 => array('id' => 4, 'pid' => 2, 'name' => '哈尔滨市'), 5 => array('id' => 5, 'pid' => 2, 'name' => '鸡西市'), 6 => array('id' => 6, 'pid' => 4, 'name' => '香坊区'), 7 => array('id' => 7, 'pid' => 4, 'name' => '南岗区'), 8 => array('id' => 8, 'pid' => 6, 'name' => '和兴路'), 9 => array('id' => 9, 'pid' => 7, 'name' => '西大直街'), 10 => array('id' => 10, 'pid' => 8, 'name' => '东北林业大学'), 11 => array('id' => 11, 'pid' => 9, 'name' => '哈尔滨工业大学'), 12 => array('id' => 12, 'pid' => 8, 'name' => '哈尔滨师范大学'), 13 => array('id' => 13, 'pid' => 1, 'name' => '赣州市'), 14 => array('id' => 14, 'pid' => 13, 'name' => '赣县'), 15 => array('id' => 15, 'pid' => 13, 'name' => '于都县'), 16 => array('id' => 16, 'pid' => 14, 'name' => '茅店镇'), 17 => array('id' => 17, 'pid' => 14, 'name' => '大田乡'), 18 => array('id' => 18, 'pid' => 16, 'name' => '义源村'), 19 => array('id' => 19, 'pid' => 16, 'name' => '上坝村'), ); echo "<pre>"; print_r(genTree5($items)); print_r(genTree9($items)); //后者输出格式，前者类似，只是数组键值不一样，不过不影响数据结构 /* Array ( [0] => Array ( [id] => 1 [pid] => 0 [name] => 江西省 [son] => Array ( [0] => Array ( [id] => 3 [pid] => 1 [name] => 南昌市 ) [1] => Array ( [id] => 13 [pid] => 1 [name] => 赣州市 [son] => Array ( [0] => Array ( [id] => 14 [pid] => 13 [name] => 赣县 [son] => Array ( [0] => Array ( [id] => 16 [pid] => 14 [name] => 茅店镇 [son] => Array ( [0] => Array ( [id] => 18 [pid] => 16 [name] => 义源村 ) [1] => Array ( [id] => 19 [pid] => 16 [name] => 上坝村 ) ) ) [1] => Array ( [id] => 17 [pid] => 14 [name] => 大田乡 ) ) ) [1] => Array ( [id] => 15 [pid] => 13 [name] => 于都县 ) ) ) ) ) [1] => Array ( [id] => 2 [pid] => 0 [name] => 黑龙江省 [son] => Array ( [0] => Array ( [id] => 4 [pid] => 2 [name] => 哈尔滨市 [son] => Array ( [0] => Array ( [id] => 6 [pid] => 4 [name] => 香坊区 [son] => Array ( [0] => Array ( [id] => 8 [pid] => 6 [name] => 和兴路 [son] => Array ( [0] => Array ( [id] => 10 [pid] => 8 [name] => 东北林业大学 ) [1] => Array ( [id] => 12 [pid] => 8 [name] => 哈尔滨师范大学 ) ) ) ) ) [1] => Array ( [id] => 7 [pid] => 4 [name] => 南岗区 [son] => Array ( [0] => Array ( [id] => 9 [pid] => 7 [name] => 西大直街 [son] => Array ( [0] => Array ( [id] => 11 [pid] => 9 [name] => 哈尔滨工业大学 ) ) ) ) ) ) ) [1] => Array ( [id] => 5 [pid] => 2 [name] => 鸡西市 ) ) ) )*/
<?php function genTree5($items) { foreach ($items as $item) $items[$item['pid']]['son'][$item['id']] = &$items[$item['id']]; return isset($items[0]['son']) ? $items[0]['son'] : array();} /** * 将数据格式化成树形结构 * @author Xuefen.Tong * @param array $items * @return array */function genTree9($items) { $tree = array(); //格式化好的树 foreach ($items as $item) if (isset($items[$item['pid']])) $items[$item['pid']]['son'][] = &$items[$item['id']]; else $tree[] = &$items[$item['id']]; return $tree;} $items = array( 1 => array('id' => 1, 'pid' => 0, 'name' => '江西省'), 2 => array('id' => 2, 'pid' => 0, 'name' => '黑龙江省'), 3 => array('id' => 3, 'pid' => 1, 'name' => '南昌市'), 4 => array('id' => 4, 'pid' => 2, 'name' => '哈尔滨市'), 5 => array('id' => 5, 'pid' => 2, 'name' => '鸡西市'), 6 => array('id' => 6, 'pid' => 4, 'name' => '香坊区'), 7 => array('id' => 7, 'pid' => 4, 'name' => '南岗区'), 8 => array('id' => 8, 'pid' => 6, 'name' => '和兴路'), 9 => array('id' => 9, 'pid' => 7, 'name' => '西大直街'), 10 => array('id' => 10, 'pid' => 8, 'name' => '东北林业大学'), 11 => array('id' => 11, 'pid' => 9, 'name' => '哈尔滨工业大学'), 12 => array('id' => 12, 'pid' => 8, 'name' => '哈尔滨师范大学'), 13 => array('id' => 13, 'pid' => 1, 'name' => '赣州市'), 14 => array('id' => 14, 'pid' => 13, 'name' => '赣县'), 15 => array('id' => 15, 'pid' => 13, 'name' => '于都县'), 16 => array('id' => 16, 'pid' => 14, 'name' => '茅店镇'), 17 => array('id' => 17, 'pid' => 14, 'name' => '大田乡'), 18 => array('id' => 18, 'pid' => 16, 'name' => '义源村'), 19 => array('id' => 19, 'pid' => 16, 'name' => '上坝村'),);echo "<pre>";print_r(genTree5($items));print_r(genTree9($items)); //后者输出格式，前者类似，只是数组键值不一样，不过不影响数据结构/*Array([0] => Array ( [id] => 1 [pid] => 0 [name] => 江西省 [son] => Array ( [0] => Array ( [id] => 3 [pid] => 1 [name] => 南昌市 ) [1] => Array ( [id] => 13 [pid] => 1 [name] => 赣州市 [son] => Array ( [0] => Array ( [id] => 14 [pid] => 13 [name] => 赣县 [son] => Array ( [0] => Array ( [id] => 16 [pid] => 14 [name] => 茅店镇 [son] => Array ( [0] => Array ( [id] => 18 [pid] => 16 [name] => 义源村 ) [1] => Array ( [id] => 19 [pid] => 16 [name] => 上坝村 ) ) ) [1] => Array ( [id] => 17 [pid] => 14 [name] => 大田乡 ) ) ) [1] => Array ( [id] => 15 [pid] => 13 [name] => 于都县 ) ) ) ) ) [1] => Array ( [id] => 2 [pid] => 0 [name] => 黑龙江省 [son] => Array ( [0] => Array ( [id] => 4 [pid] => 2 [name] => 哈尔滨市 [son] => Array ( [0] => Array ( [id] => 6 [pid] => 4 [name] => 香坊区 [son] => Array ( [0] => Array ( [id] => 8 [pid] => 6 [name] => 和兴路 [son] => Array ( [0] => Array ( [id] => 10 [pid] => 8 [name] => 东北林业大学 ) [1] => Array ( [id] => 12 [pid] => 8 [name] => 哈尔滨师范大学 ) ) ) ) ) [1] => Array ( [id] => 7 [pid] => 4 [name] => 南岗区 [son] => Array ( [0] => Array ( [id] => 9 [pid] => 7 [name] => 西大直街 [son] => Array ( [0] => Array ( [id] => 11 [pid] => 9 [name] => 哈尔滨工业大学 ) ) ) ) ) ) ) [1] => Array ( [id] => 5 [pid] => 2 [name] => 鸡西市 ) ) ))*/