php+mysql实现的无限分类方法类定义与使用示例

本文实例讲述了php+mysql实现的无限分类方法类定义与使用。分享给大家供大家参考，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", $this->link);
 }
}
//函数
function back(){
 echo '<script language="javascript">window.location.href="test.php?" rel="external nofollow" +new date().gettime();</script>';
 exit;
}
//声成select
function makeselect($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.'" rel="external nofollow" >del</a> <a onclick="mod('.$id.')">edit</a> </li>';
}
?>
</ul>