php+mysql数据库无限分类代码

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($node = mysql_fetch_array($results)){
$this->setnode($node['id'],$node['f_id'],$node['name']);
}
}
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){
//echo "insert into $this->table (`f_id`,`name`) values ('$pid','$name')";exit;
mysql_query("insert into $this->table (`f_id`,`name`) values ('$pid','$name')",$this->link);

}
function modnode($cid, $newname){
mysql_query("update $this->table set `name`='$newname' where `id` = $cid",$this->link);
}
function delnode($cid){
$allchilds = $this->getchilds($cid);
$sql ='';
if(empty($allchilds)){
$sql = "delete from $this->table where `id` = $cid";
}else{
$sql = 'delete from '.$this->table.' where `id` in ('.implode(',',$allchilds).','.$cid.')';
}
mysql_query($sql,$this->link);
}
function movenode($cid, $topid){
mysql_query("update $this->table set `f_id`=$topid where `id` = $cid", $this->link);
}
}
//函数
function back(){
echo '';
exit;
}
//生成select
function makeselect($array,$formname){
global $tree;
$select = '';
foreach ($array as $id){
$select.=''.$tree->getlayer($id, '|-').$tree->getvalue($id)."";
}
return $select.'';
}
$tree = new sortclass($link,'`p_newsclass`');
$op = !empty($_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();
?>

移动分类

foreach ($category as $id){
echo '
• '.$tree->getlayer($id, '|－ ').$tree->getvalue($id).'
';
}
?>