php实现的无极分类(递归)的代码

3. $conn=mysql_connect("localhost","root","myoa888");

4. mysql_select_db("lost63",$conn) or die("select db error");
5. $sql[]="Create TABLE `lost63`.`dd_book_class` (
6. `id` INT NOT NULL AUTO_INCREMENT PRIMARY KEY ,
7. `classname` VARCHAR( 50 ) NOT NULL ,
8. `classid` INT NOT NULL
9. )";
10. $sql[]="insert `dd_book_class` (classname,classid) values ('小说',0)";
11. $sql[]="insert `dd_book_class` (classname,classid) values ('文艺',0)";
12. $sql[]="insert `dd_book_class` (classname,classid) values ('青春',0)";
13. $sql[]="insert `dd_book_class` (classname,classid) values ('励志/成功',0)";
14. $sql[]="insert `dd_book_class` (classname,classid) values ('少儿',0)";
15. $sql[]="insert `dd_book_class` (classname,classid) values ('悬疑',1)";
16. $sql[]="insert `dd_book_class` (classname,classid) values ('言情',1)";
17. $sql[]="insert `dd_book_class` (classname,classid) values ('职场',1)";
18. $sql[]="insert `dd_book_class` (classname,classid) values ('文学',2)";
19. $sql[]="insert `dd_book_class` (classname,classid) values ('科普',5)";
20. //print_r($sql);
21. /* -- insert test data -- */
22. foreach($sql as $value){
23. mysql_query($value) or die("insert data error");
24. }

25. $class_arr=array();

26. $recordset=mysql_query("select * from `dd_book_class`");
27. while($row=mysql_fetch_array($recordset)){
28. $class_arr[]=array($row['id'],$row['classname'],$row['classid']);
29. }
30. function classtree($n,$id){
31. global $class_arr;
32. $n = str_pad('',$n,'-',STR_PAD_RIGHT);
33. $n = str_replace("-"," ",$n);
34. for($i=0;$iif($class_arr[$i][2]==$id){
35. echo $n.'┠'.$class_arr[$i]
36. [1].'

';
37. classtree($n+1,$class_arr[$i][0]);
38. }
39. }
40. }
41. classtree(0,0);
42. ?>

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