本文例項講述了php+mysql實現的無限分類方法類定義與使用。分享給大家供大家參考，具體如下：

建立資料庫以及表

 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");
//連線資料庫
$link = mysql_connect('localhost','root','eric') or die(mysql_error());
mysql_select_db('sortclass',$link);
//無限分類類庫
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,'頂極節點');
  $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);
 }
}
//函式
function back(){
 echo '<script language="JavaScript">window.location.href="test.php?" rel="external nofollow" +new Date().getTime();</script>';
 exit;
}
//聲成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';
   $('name').style.border='1px solid red';
  }
 </script>
 <form action="test.php" method="post">
  名稱:<input type="text" id="name" name="cname" /> 新增到:<?=makeSelect($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>移動分類</h3>
 <form action="test.php" method="post">
  <?=makeSelect($category,'who')?>移動到:<?=makeSelect($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>

更多關於PHP相關內容感興趣的讀者可檢視本站專題：《php+mysql資料庫操作入門教程》、《php+mysqli資料庫程式設計技巧總結》、《php面向物件程式設計入門教程》、《PHP陣列(Array)操作技巧大全》、《php字串(string)用法總結》及《php常見資料庫操作技巧彙總》

希望本文所述對大家PHP程式設計有所幫助。