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php+mysql实现的无限分类方法类定义与使用，具体如下：
创建数据库以及表
CREATE DATABASE `sortclass`DEFAULT CHARSET utf8; CREATE TABLE IF NOT EXISTS `class` ( `cid` mediumint(8) unsigned NOT NULL auto_increment, `pid` mediumint(8) unsigned NOT NULL, `cname` varchar(50) NOT NULL, PRIMARY KEY (`cid`), KEY `pid` (`pid`) ) ENGINE=MyISAM DEFAULT CHARSET=utf8;
header("Content-type: text/html; charset=utf-8");
//连接数据库
$link = mysql_connect('localhost','root','eric') or die(mysql_error());
mysql_select_db('sortclass',$link);
//无限分类类库
class SortClass{
var $data = array();
var $child = array(-1=>array());
var $layer = array(-1=>-1);
var $parent = array();
var $link;
var $table;
function SortClass($link, $table){
$this->setNode(0, -1, '顶极节点');
$this->link = $link;
$this->table = $table;
$node = array();
$results = mysql_query('select * from '.$this->table.'',$this->link);
while($node = mysql_fetch_assoc($results)){
$this->setNode($node['cid'],$node['pid'],$node['cname']);
}
}
function setNode ($id, $parent, $value){
$parent = $parent?$parent:0;
$this->data[$id] = $value;
$this->child[$id] = array();
$this->child[$parent][] = $id;
$this->parent[$id] = $parent;
$this->layer[$id] = !isset($this->layer[$parent])? 0 : $this->layer[$parent] + 1;
}
function getList (&$tree, $root= 0){
foreach ($this->child[$root] as $key=>$id){
$tree[] = $id;
if ($this->child[$id]) $this->getList($tree, $id);
}
}
function getValue ($id){return $this->data[$id];}
function getLayer ($id, $space = false){
return $space?str_repeat($space, $this->layer[$id]):$this->layer[$id];
}
function getParent ($id){return $this->parent[$id];}
function getParents ($id){
while ($this->parent[$id] != -1){
$id = $parent[$this->layer[$id]] = $this->parent[$id];
}
ksort($parent);
reset($parent);
return $parent;
}
function getChild ($id){return $this->child[$id];}
function getChilds ($id = 0){
$child = array($id);
$this->getList($child, $id);
return $child;
}
function addNode($name,$pid){
mysql_query("insert into $this->table (`pid`,`cname`) values ('$pid','$name')",$this->link);
}
function modNode($cid, $newName){
mysql_query("update $this->table set `cname`='$newName' where `cid` = $cid",$this->link);
}
function delNode($cid){
$allChilds = $this->getChilds($cid);
$sql ='';
if(empty($allChilds)){
$sql = "delete from $this->table where `cid` = $cid";
}else{
$sql = 'delete from '.$this->table.' where `cid` in ('.implode(',',$allChilds).','.$cid.')';
}
mysql_query($sql,$this->link);
}
function moveNode($cid, $topid){
mysql_query("update $this->table set `pid`=$topid where `cid` = $cid", $this->link);
}
}
//函数
function back(){
echo 'window.location.href="test.php?" rel="external nofollow" +new Date().getTime();';
exit;
}
//声成select
function makeSelect($array,$formName){
global $tree;
$select = '';
foreach ($array as $id){
$select.=''.$tree->getLayer($id, '|-').$tree->getValue($id)."";
}
return $select.'';
}
$tree = new SortClass($link,'`class`');
$op = !empty($_POST['op']) ? $_POST['op'] : $_GET['op'];
if(!empty($op)){
if($op=='add'){
$tree->addNode($_POST['cname'],$_POST['pid']);
back();
}
if($op=='mod'){
$tree->modNode($_POST['cid'],$_POST['cname']);
back();
}
if($op=='del'){
$tree->delNode($_GET['cid']);
back();
}
if($op=='move'){
$tree->moveNode($_POST['who'],$_POST['to']);
back();
}
}
$category = $tree->getChilds();
?>
body{font-size:12px;}
ul{list-style:none;}
a{cursor:pointer;}
function $(e){return document.getElementById(e);}
function mod(cid){
$('cid').value=cid;
$('op').value='mod';
$('name').style.border='1px solid red';
}
名称:移动分类
移动到:
'.$tree->getLayer($id, '|－ ').$tree->getValue($id).' Del Edit ';
}
?>
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