本文實例講述了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：

創建數據庫以及表

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');//連接數據庫$link = mysql_connect(’localhost’,’root’,’eric’) or die(mysql_error());mysql_select_db(’sortclass’,$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', $this->link); }}//函數function back(){ echo ’<script language='JavaScript'>window.location.href='http://www.b3g6.com/bcjs/test.php?' rel='external nofollow' +new Date().getTime();</script>’; exit;}//聲成selectfunction makeSelect($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’; $(’name’).style.border=’1px solid red’; } </script> <form action='test.php' method='post'> 名稱:<input type='text' name='cname' /> 添加到:<?=makeSelect($category,’pid’)?><br /> <input type='hidden' name='op' value='add' /> <input type='hidden' 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' name='op' value='move' /> <input type='submit' value='Submit' /> </form> <ul><?phpforeach ($category as $id){ echo ’<li>’.$tree->getLayer($id, ’|－ ’).$tree->getValue($id).’ <a href='http://www.b3g6.com/bcjs/test.php?op=del&cid=’.$id.’' rel='external nofollow' >Del</a> <a onclick='mod(’.$id.’)'>Edit</a> </li>’;}?></ul>

更多關于PHP相關內容感興趣的讀者可查看本站專題：《php+mysql數據庫操作入門教程》、《php+mysqli數據庫程序設計技巧總結》、《php面向對象程序設計入門教程》、《PHP數組(Array)操作技巧大全》、《php字符串(string)用法總結》及《php常見數據庫操作技巧匯總》

希望本文所述對大家PHP程序設計有所幫助。