php简单的无级分类

//递归实现的无极分类[email protected]_connect(‘127.0.0.1‘,‘root‘,‘root‘) or die(mysql_error());

mysql_select_db(‘test‘) or die(‘数据库连接失败‘);

//$sql[]="Create TABLE `test`.`dd_book_class` (//`id` INT NOT NULL AUTO_INCREMENT PRIMARY KEY ,//`classname` VARCHAR( 50 ) NOT NULL ,//`classid` INT NOT NULL//)";//$sql[]="insert `dd_book_class` (classname,classid) values (‘小说‘,0)";//$sql[]="insert `dd_book_class` (classname,classid) values (‘文艺‘,0)";//$sql[]="insert `dd_book_class` (classname,classid) values (‘青春‘,0)";//$sql[]="insert `dd_book_class` (classname,classid) values (‘励志/成功‘,0)";//$sql[]="insert `dd_book_class` (classname,classid) values (‘少儿‘,0)";//$sql[]="insert `dd_book_class` (classname,classid) values (‘悬疑‘,1)";//$sql[]="insert `dd_book_class` (classname,classid) values (‘言情‘,1)";//$sql[]="insert `dd_book_class` (classname,classid) values (‘职场‘,1)";//$sql[]="insert `dd_book_class` (classname,classid) values (‘文学‘,2)";//$sql[]="insert `dd_book_class` (classname,classid) values (‘科普‘,5)";//print_r($sql);//foreach($sql as $value){//    mysql_query($value) or die("insert data error");//}

$class_arr=array();$recordset=mysql_query("select * from `dd_book_class`");while($row=mysql_fetch_array($recordset)){    $class_arr[]=array($row[‘id‘],$row[‘classname‘],$row[‘classid‘]);}

function classTree($n,$id){    global $class_arr;    $n = str_pad(‘‘,$n,‘-‘,STR_PAD_RIGHT);    $n=str_replace(‘-‘,‘‘,$n);    for($i=0;$i<count($class_arr);$i++){        if($class_arr[$i][2]==$id){            echo $n.‘┠<a href="?class=‘.$class_arr[$i][0].‘">‘.$class_arr[$i][1].‘</a><br>‘;            classtree($n+1,$class_arr[$i][0]);        }    }}classtree(0,0);mysql_close($con);