一棵php的类树(支持无限分类)

最近问无限分类的类树问题比较多，所以一高兴自己写了一个，我刚写完的，大家用用看，看看怎么实现起来更快，更简单，把你的树也贴出来(要只查询一次数据库的)

这是一棵分类列表的类树, 支持无限分类

一个分类下面可以同时有"包含子类的分类"和"最终分类";

唯一的优点是*****只需要进行一次的数据库*****查询.

样子不是很好看，不过可以自定义修改,可以自己定义css加里面

缓存方面还没有作，可以自己补上

下面例子的目录结构是这样的。

¦--Catagory.php

¦--images----tree.jsp

¦--images----treeopen.gif

¦--images----treeclose.gif

¦--images----line.gif

/****************tree.jsp********************/

function expand(id){

node = document.all('node'+id);

if(node.style.display==''){

node.style.display = 'none';

document.images('img'+id).src = imgopen;

}else{

node.style.display = '';

document.images('img'+id).src = imgclose;

}

}

/****************Catagory.php********************/

define('CATAGORY_TREE_EXPEND_NONE',0);

define('CATAGORY_TREE_EXPEND_ALL',1);

class Catagory{

//基础分类数据

var $treeData = array();

//分类的等级结构数组，以分类的id值作为数组的关键字

var $treePList = array();

//自分类对应上级类的关系

var $treeCList = array();

/*

* 这个是大分类的模板

*

* __id__ 分类的编号

* __name__ 分类的名称

* __image__ 分类前面显示的图像名称 $imgOpen or $imgClose

* __open__ 分类当前是否是展开的

* __inner__ 子分类显示的位置 * 样式可以根据自己的需要任意修改 ，但是不能删除现有的元素

*/

var $blockTpl = '

/*

* 这个是小分类的模板

*

* see $blockTpl

*/

var $elementTpl = '__name__

';

/*

* 这个是当前位置显示模板

*

* see $blockTpl

*/

var $currentTpl = '__name__';

var $js = "images/tree.js";

var $imgOpen = 'images/treeopen.gif';

var $imgClose = 'images/treeclose.gif';

var $imgLine = 'images/line.gif';

var $cachFile = '';

var $expand = 0;

var $result = array();

var $treeStr = '';

var $currentStr = '';

/*

* 用来初始化，传入分类数据

*

*param $data array()

*/

function Catagory(&$data){

$this->_init($data);

}

function _init($tmpData){

$plevel = $clevel = $treeData = array(); foreach($tmpData as $value){

$treeData[$value['id']] = $value;

$plevel[$value['pid']][$value['id']] = 'END';

$clevel[$value['id']] = $value['pid'];

}

$this->treeData = &$treeData;

$this->treePList = &$plevel;

$this->treeCList = &$clevel;

}

/*

* 解析分类列表

*

*param $cataId int 要解析的主分类的编号

*/

function parseNode($cataId=0){

$this->result = $this->treePList[$cataId];

if($this->result==null) die("Catagory id error");

$this->treeStr = $this->_doNode($this->result);

$this->treeStr .= $this->_jsParse();

}

function &_doNode(&$result){

$nstr = $estr = '';

foreach($result as $key=>$value){

if(isset($this->treePList[$key])){

$result[$key] = $this->treePList[$key];

$inner = $this->_doNode($result[$key]);

$nstr .= $this->_parseNodeTpl($key, $inner);

}else{

$estr .= $this->_parseElementTpl($key);

}

}

return $nstr.$estr;

}

function &_parseNodeTpl($cataId, $inner){

$data = $this->treeData[$cataId];

$str = preg_replace(' ¦__id__ ¦', $data['id'], $this->blockTpl);

$str = preg_replace(' ¦__name__ ¦', $data['name'], $str);

$str = preg_replace(' ¦__image__ ¦', ($this->expand? $this->imgClose:$this->imgOpen), $str);

$str = preg_replace(' ¦__open__ ¦', ($this->expand?'':'none'), $str);

$str = preg_replace(' ¦__inner__ ¦', $inner, $str);

return $str;

}

function _parseElementTpl($cataId){

$data = $this->treeData[$cataId];

$str = preg_replace(' ¦__id__ ¦', $data['id'], $this->elementTpl);

$str = preg_replace(' ¦__name__ ¦', $data['name'], $str);

$str = preg_replace(' ¦__image__ ¦', $this->imgLine, $str);

return $str;

} function _jsParse(){

$str = "";

return $str;

}

/*

* 展开分类$cataId

*

*param $cataId int 要展开的分类的编号

*/

function parseCurrent($cataId){

$str = '';

$str .= $this->_parseCurrentTpl($cataId);

while(isset($this->treeCList[$cataId]) && $this->treeCList[$cataId]!=0){

$cataId = $this->treeCList[$cataId];

$str = $this->_parseCurrentTpl($cataId).'->'.$str;

}

$this->currentStr = &$str;

}

function _parseCurrentTpl($cataId){

$data = $this->treeData[$cataId];

$str = preg_replace(' ¦__id__ ¦', $data['id'], $this->currentTpl);

$str = preg_replace(' ¦__name__ ¦', $data['name'], $str);

return $str;

}

/*

* 解析当前分类的路径

*

*param $cataId int 要解析的主分类的编号

*/

function expand($cataId){

if($this->expand>0) return ;

$str = '';

if(isset($this->treePList[$cataId])) $str .= "expand($cataId);";

while(isset($this->treeCList[$cataId]) && $this->treeCList[$cataId]!=0){

$str .= "expand(".$this->treeCList[$cataId].");";

$cataId = $this->treeCList[$cataId];

}

$this->treeStr .= "";

}

/*

* 返回当前分类的路径

*/

function getCurrentStr(){ return $this->currentStr;

}

/*

* 返回分类的类树

*/

function getTreeStr(){

return $this->treeStr;

}

function setTpl($blockTpl, $elementTpl, $currentTpl, $js){

$this->blockTpl = $blockTpl;

$this->elementTpl = $elementTpl;

$this->currentTpl = $currentTpl;

$this->js = $js;

}

function setImage($open, $close, $line){

$this->imgOpen = $open;

$this->imgClose = $close;

$this->imgLine = $line;

}

function setExpend($expand){

$this->expand = $expand;

}

}

//分类的基础数据的样子如下:

$data = array(array('id'=>1, 'name'=>'name1', 'pid'=>0, 'order'=>1),

array('id'=>2, 'name'=>'name2', 'pid'=>1, 'order'=>1),

array('id'=>3, 'name'=>'name3', 'pid'=>0, 'order'=>1),

array('id'=>4, 'name'=>'name4', 'pid'=>3, 'order'=>1),

array('id'=>5, 'name'=>'name5', 'pid'=>6, 'order'=>1),

array('id'=>6, 'name'=>'name6', 'pid'=>2, 'order'=>1),

array('id'=>7, 'name'=>'name7', 'pid'=>6, 'order'=>1),

array('id'=>8, 'name'=>'name8', 'pid'=>3, 'order'=>1),

array('id'=>9, 'name'=>'name9', 'pid'=>6, 'order'=>1),

array('id'=>10, 'name'=>'name10', 'pid'=>0, 'order'=>1),

array('id'=>11, 'name'=>'name11', 'pid'=>10, 'order'=>1),

array('id'=>12, 'name'=>'name12', 'pid'=>10, 'order'=>1),

array('id'=>13, 'name'=>'name13', 'pid'=>10, 'order'=>1),

array('id'=>14, 'name'=>'name14', 'pid'=>12, 'order'=>1),

array('id'=>15, 'name'=>'name15', 'pid'=>12, 'order'=>4),

); echo "";

$tree = new Catagory($data);

echo "

//$tree->setExpend(1);

$tree->parseNode(0);

//$tree->parseNode(1);

//$tree->expand(9);

echo $tree->getTreeStr();

echo "

$tree->parseCurrent(9);

echo $tree->getCurrentStr();