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", $this->link); }}//函数function back(){ echo '<script language="JavaScript">window.location.href="test.php?" rel="external nofollow" +new Date().getTime();</script>'; exit;}//声成selectfunction makeSelect($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><?phpforeach ($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>

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希望本文所述对大家PHP程序设计有所帮助。