无限分类原理

<?php
 

  
 mysql_connect("localhost","root","root");
 
  
 mysql_select_db("test");
 
  
 mysql_query("set names gb2312");
 
  
 function select($fid,$kong){
 
  
  
 $query=mysql_query("select * from class where class_id_father='$fid' order by class_id asc");//------------------------------------ 查询$fid的儿子分类
 
  
  
 while($arr=mysql_fetch_array($query)){
 
  
  
  
 echo "<option value=\"".$arr[class_id]."\">";
 
  
  
  
 for($i=0;$i<$kong;$i++){//------------------------------------根据$kong输出选项前面的空格.$kong控制子父分类的缩进
 
  
  
  
  
 echo "  ";
 
  
  
  
 }
 
  
  
  
 $he=$kong;
 
  
  
  
 $kong++;
 
  
  
  
 echo "┗".$arr[class_name];
 
  
  
  
 echo "</option>";
 
  
  
  
 select($arr[class_id],$kong);//------------------------------------递归查询此类的儿子分类
 
  
  
  
 $kong=$he;//------------------------------------同级的儿子分类查询完后做这句，将$kong还原到此同级分类前使用的值
 
  
  
 }
 
  
 }
 
  
 if($_POST['add']!=""){
 
  
  
 if(mysql_query("insert into class (class_name,class_id_father) values ('$_POST[class_name]','$_POST[class_id]')"))
 
  
  
  
 echo "<script>alert('恭喜，分类添加成功！！');window.location.href='./wxfl.php';</script>";
 
  
 }
 
 ?>
 
 <form name="form_class" action="" method="post">
 
  
 添加分类  
 
  
 <select name="class_id" style="width:200px;">
 
  
  
 <option vlaue="0" selected="selected">顶层分类</option>
 
  
  
 <?php select(0,0); ?>
 
  
 </select>
 
  
   
 
  
   
 <input type="text" name="class_name" />
 
  
   
   
 
  
   
 <input type="submit" name="add" value="添加分类">
 
 </form>
 
 <?php
 
  
 function all($fid,$kong){//------------------------------------------------------------以下为输出列表，和上面的有一点不同，但原理都一样
 
  
  
 $query=mysql_query("select * from class where class_id_father='$fid' order by class_id asc");
 
  
  
 while($arr=mysql_fetch_array($query)){
 
  
  
  
 for($i=0;$i<$kong;$i++){
 
  
  
  
  
 echo "  ";
 
  
  
  
 }
 
  
  
  
 $he=$kong;
 
  
  
  
 $kong++;
 
  
  
  
 echo "┗".$arr[class_name]."  <a href='?id=".$arr[class_id]."'>修改</a>  <a href='?id=".$arr[class_id]."'>删除</a><hr>";
 
  
  
  
 all($arr[class_id],$kong);
 
  
  
  
 $kong=$he;
 
  
  
 }
 
  
 }
 
  
 all(0,0);
 
 ?>