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

1. CREATE DATABASE `sortclass`DEFAULT CHARSET utf8;
2. CREATE TABLE IF NOT EXISTS `class` (
3. `cid` mediumint(8) unsigned NOT NULL auto_increment,
4. `pid` mediumint(8) unsigned NOT NULL,
5. `cname` varchar(50) NOT NULL,
6. PRIMARY KEY (`cid`),
7. KEY `pid` (`pid`)
8. ) ENGINE=MyISAM DEFAULT CHARSET=utf8;

PHP代码：

1. header("Content-type: text/html; charset=utf-8");
2. //连接数据库
3. $link = mysql_connect('localhost','root','eric') or die(mysql_error());
4. mysql_select_db('sortclass',$link);
5. //无限分类类库
6. class SortClass{
7. var $data = array();
8. var $child = array(-1=>array());
9. var $layer = array(-1=>-1);
10. var $parent = array();
11. var $link;
12. var $table;
13. function SortClass($link, $table){
14. $this->setNode(0, -1, '顶极节点');
15. $this->link = $link;
16. $this->table = $table;
17. $node = array();
18. $results = mysql_query('select * from '.$this->table.'',$this->link);
19. while($node = mysql_fetch_assoc($results)){
20. $this->setNode($node['cid'],$node['pid'],$node['cname']);
21. }
22. }
23. function setNode ($id, $parent, $value){
24. $parent = $parent?$parent:0;
25. $this->data[$id] = $value;
26. $this->child[$id] = array();
27. $this->child[$parent][] = $id;
28. $this->parent[$id] = $parent;
29. $this->layer[$id] = !isset($this->layer[$parent])? 0 : $this->layer[$parent] + 1;
30. }
31. function getList (&$tree, $root= 0){
32. foreach ($this->child[$root] as $key=>$id){
33. $tree[] = $id;
34. if ($this->child[$id]) $this->getList($tree, $id);
35. }
36. }
37. function getValue ($id){return $this->data[$id];}
38. function getLayer ($id, $space = false){
39. return $space?str_repeat($space, $this->layer[$id]):$this->layer[$id];
40. }
41. function getParent ($id){return $this->parent[$id];}
42. function getParents ($id){
43. while ($this->parent[$id] != -1){
44. $id = $parent[$this->layer[$id]] = $this->parent[$id];
45. }
46. ksort($parent);
47. reset($parent);
48. return $parent;
49. }
50. function getChild ($id){return $this->child[$id];}
51. function getChilds ($id = 0){
52. $child = array($id);
53. $this->getList($child, $id);
54. return $child;
55. }
56. function addNode($name,$pid){
57. mysql_query("insert into $this->table (`pid`,`cname`) values ('$pid','$name')",$this->link);
58. }
59. function modNode($cid, $newName){
60. mysql_query("update $this->table set `cname`='$newName' where `cid` = $cid",$this->link);
61. }
62. function delNode($cid){
63. $allChilds = $this->getChilds($cid);
64. $sql ='';
65. if(emptyempty($allChilds)){
66. $sql = "delete from $this->table where `cid` = $cid";
67. }else{
68. $sql = 'delete from '.$this->table.' where `cid` in ('.implode(',',$allChilds).','.$cid.')';
69. }
70. mysql_query($sql,$this->link);
71. }
72. function moveNode($cid, $topid){
73. mysql_query("update $this->table set `pid`=$topid where `cid` = $cid", $this->link);
74. }
75. }
76. //函数
77. function back(){
78. echo '<script language="JavaScript">window.location.href="test.php?" rel="external nofollow" +new Date().getTime();</script>';
79. exit;
80. }
81. //声成select
82. function makeSelect($array,$formName){
83. global $tree;
84. $select = '<select name="'.$formName.'">';
85. foreach ($array as $id){
86. $select.='<option value="'.$id.'">'.$tree->getLayer($id, '|-').$tree->getValue($id)."</option>";
87. }
88. return $select.'</select>';
89. }
90. $tree = new SortClass($link,'`class`');
91. $op = !emptyempty($_POST['op']) ? $_POST['op'] : $_GET['op'];
92. if(!emptyempty($op)){
93. if($op=='add'){
94. $tree->addNode($_POST['cname'],$_POST['pid']);
95. back();
96. }
97. if($op=='mod'){
98. $tree->modNode($_POST['cid'],$_POST['cname']);
99. back();
100. }
101. if($op=='del'){
102. $tree->delNode($_GET['cid']);
103. back();
104. }
105. if($op=='move'){
106. $tree->moveNode($_POST['who'],$_POST['to']);
107. back();
108. }
109. }
110. $category = $tree->getChilds();
111. ?>
112. <style type="text/css">
113. body{font-size:12px;}
114. ul{list-style:none;}
115. a{cursor:pointer;}
116. </style>
117. <script language="javascript">
118. function $(e){return document.getElementById(e);}
119. function mod(cid){
120. $('cid').value=cid;
121. $('op').value='mod';
122. $('name').style.;
123. }
124. </script>
125. <form action="test.php" method="post">
126. 名称:<input type="text" name="cname" /> 添加到:<?=makeSelect($category,'pid')?><br />
127. <input type="hidden" name="op" value="add" />
128. <input type="hidden" name="cid" />
129. <input type="submit" value="Submit" />
130. </form>
131. <h3>移动分类</h3>
132. <form action="test.php" method="post">
133. <?=makeSelect($category,'who')?>移动到:<?=makeSelect($category,'to')?>
134. <input type="hidden" name="op" value="move" />
135. <input type="submit" value="Submit" />
136. </form>
137. <ul>
138. <?php
139. foreach ($category as $id){
140. echo '<li>'.$tree->getLayer($id, '|－ ').$tree->getValue($id).' <a href="test.php?op=del&c" rel="external nofollow" >Del</a> <a onclick="mod('.$id.')">Edit</a> </li>';
141. }
142. ?>
143. </ul>