简单php递归无限mysql记录

<?php
 header('content-type:text/html;charget=gb2312');

 $d='';
     get_title($d,0,'=');
 function get_title($r,$id=0,$dd='='){

  $db=mysql_connect("localhost",'root','')or die('错误:'.mysql_error());
  mysql_select_db('test',$db);
  mysql_query("set names gbk");

  $qu=mysql_query("select *from li_class where fid='".$id."' order by fid desc ");
  while($row=mysql_fetch_array($qu)){

  $dd.='-';
  echo $r=$dd.$row['title'].'<br>';//连接类名
  get_title($r,$row['id'],$dd); 
  }
 }
?>