php无限分类方法类

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", $this->link);
  }
}
//函数
function back(){
  echo '<script language="JavaScript">window.location.href="test.php?"+new Date().getTime();</script>';
  exit;
}
//声成select
function makeSelect($array,$formName){
  global $tree;
  $select = '<select name="'.$formName.'">';
  foreach ($array as $id){
    $select.='<option value="'.$id.'">'.$tree->getLayer($id, '|-').$tree->getValue($id)."</option>";
  }
  return $select.'</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();
?>
  <style type="text/css">
    body{font-size:12px;}
    ul{list-style:none;}
    a{cursor:pointer;}
  </style>
  <script language="javascript">
    function $(e){return document.getElementById(e);}
    function mod(cid){
      $('cid').value=cid;
      $('op').value='mod';
      $('name').style.border='1px solid red';
    }
  </script>
  <form action="test.php" method="post">
    名称:<input type="text" id="name" name="cname" /> 添加到:<?=makeSelect($category,'pid')?><br />
    <input type="hidden" id="op" name="op" value="add" />
    <input type="hidden" id="cid" name="cid" />
    <input type="submit" value="Submit" />
  </form>
  <h3>移动分类</h3>
  <form action="test.php" method="post">
    <?=makeSelect($category,'who')?>移动到:<?=makeSelect($category,'to')?>
    <input type="hidden" id="op" name="op" value="move" />
    <input type="submit" value="Submit" />
  </form>
  <ul>
<?php
foreach ($category as $id){
  echo '<li>'.$tree->getLayer($id, '|－ ').$tree->getValue($id).' <a href="test.php?op=del&cid='.$id.'">Del</a> <a onclick="mod('.$id.')">Edit</a> </li>';
}
?>
  </ul>