PHP无限分类的实现(树形类)
2012-11-24 10:53 1257 0
PHP无限分类，Google一下就能找到很多相关资料，思路比较拉风的，也是用得比较多的就是分类表至少有id,pid,name三个字段，id自增表分类，pid为父分类，name为分类名，这样就构成了一棵树，如下，算是我查询分类表得到的结果集。
<?php
//模拟PHP无限分类查询结果
return array(
array(
‘id’=>1,
‘pid’=>0,
‘name’=>‘主页’
),
array(
‘id’=>2,
‘pid’=>0,
‘name’=>‘新闻’
),
array(
‘id’=>3,
‘pid’=>0,
‘name’=>‘媒体’
),
array(
‘id’=>4,
‘pid’=>0,
‘name’=>‘下载’
),
array(
‘id’=>5,
‘pid’=>0,
‘name’=>‘关于我们’
),
array(
‘id’=>6,
‘pid’=>2,
‘name’=>‘天朝新闻’
),
array(
‘id’=>7,
‘pid’=>2,
‘name’=>‘海外新闻’
),
array(
‘id’=>8,
‘pid’=>6,
‘name’=>‘州官新闻’
),
array(
‘id’=>9,
‘pid’=>3,
‘name’=>‘音乐’
),
array(
‘id’=>10,
‘pid’=>3,
‘name’=>‘电影’
),
array(
‘id’=>11,
‘pid’=>3,
‘name’=>‘小说’
),
array(
‘id’=>12,
‘pid’=>9,
‘name’=>‘铃声’
),
array(
‘id’=>13,
‘pid’=>9,
‘name’=>‘流行音乐’
),
array(
‘id’=>14,
‘pid’=>9,
‘name’=>‘古典音乐’
),
array(
‘id’=>15,
‘pid’=>12,
‘name’=>‘热门铃声’
),
array(
‘id’=>16,
‘pid’=>12,
‘name’=>‘搞笑铃声’
),
array(
‘id’=>17,
‘pid’=>12,
‘name’=>‘MP3铃声’
),
array(
‘id’=>18,
‘pid’=>17,
‘name’=>‘128K’
),
array(
‘id’=>19,
‘pid’=>8,
‘name’=>‘娱乐新闻’
),
array(
‘id’=>20,
‘pid’=>11,
‘name’=>‘穿越类’
),
array(
‘id’=>21,
‘pid’=>11,
‘name’=>‘武侠类’
),
);
?>
拉风归拉风，但是那些文章提供的无限分类的类相关操作有点挫，直接把对数据库操作也封装进去了。也就是别人要用你这个类，还要跟你建一样的表，真TM恶心。由于项目要用到，所以自己写了一个PHP无限分类的类（也称树形类），没有数据库的操作，只需要实例化的时候传进去结果集，也就是树形数组。再执行leaf方法或navi方法即可得到想要的结果，下面请看源码。
<?php
/**
* Tree 树型类(无限分类)
*
* @author Kvoid
* @copyright http://www.jcodecraeer.com
* @version 1.0
* @access public
* @example
* $tree= new Tree($result);
* $arr=$tree->leaf(0);
* $nav=$tree->navi(15);
*/
class Tree {
private $result;
private $tmp;
private $arr;
private $already = array();
/**
* 构造函数
*
* @param array $result 树型数据表结果集
* @param array $fields 树型数据表字段，array(分类id,父id)
* @param integer $root 顶级分类的父id
*/
public function __construct($result, $fields = array('id', 'pid'), $root = 0) {
$this->result = $result;
$this->fields = $fields;
$this->root = $root;
$this->handler();
}
/**
* 树型数据表结果集处理
*/
private function handler() {
foreach ($this->result as $node) {
$tmp\[$node\[$this->fields\[1\]\]\]\[\] = $node;
}
krsort($tmp);
for ($i = count($tmp); $i > 0; $i--) {
foreach ($tmp as $k => $v) {
if (!in_array($k, $this->already)) {
if (!$this->tmp) {
$this->tmp = array($k, $v);
$this->already\[\] = $k;
continue;
} else {
foreach ($v as $key => $value) {
if ($value\[$this->fields\[0\]\] == $this->tmp\[0\]) {
$tmp\[$k\]\[$key\]\['child'\] = $this->tmp\[1\];
$this->tmp = array($k, $tmp\[$k\]);
}
}
}
}
}
$this->tmp = null;
}
$this->tmp = $tmp;
}
/**
* 反向递归
*/
private function recur_n($arr, $id) {
foreach ($arr as $v) {
if ($v\[$this->fields\[0\]\] == $id) {
$this->arr\[\] = $v;
if ($v\[$this->fields\[1\]\] != $this->root) $this->recur_n($arr, $v\[$this->fields\[1\]\]);
}
}
}
/**
* 正向递归
*/
private function recur_p($arr) {
foreach ($arr as $v) {
$this->arr\[\] = $v\[$this->fields\[0\]\];
if ($v\['child'\]) $this->recur_p($v\['child'\]);
}
}
/**
* 菜单 多维数组
*
* @param integer $id 分类id
* @return array 返回分支，默认返回整个树
*/
public function leaf($id = null) {
$id = ($id == null) ? $this->root : $id;
return $this->tmp\[$id\];
}
/**
* 导航 一维数组
*
* @param integer $id 分类id
* @return array 返回单线分类直到顶级分类
*/
public function navi($id) {
$this->arr = null;
$this->recur_n($this->result, $id);
krsort($this->arr);
return $this->arr;
}
/**
* 散落 一维数组
*
* @param integer $id 分类id
* @return array 返回leaf下所有分类id
*/
public function leafid($id) {
$this->arr = null;
$this->arr\[\] = $id;
$this->recur_p($this->leaf($id));
return $this->arr;
}
}
?>
