php+mysql实现的无限分类方法类定义与使用示例_PHP教程

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>