layout: post
title: "PHP无限级分类"
date: 2016-04-29 09:36:19 +0800
comments: true
categories: [PHP]
PHP无限级分类主要有两种实现方式，通过递归和全路径实现
一、递归实现
在数据库中存储如下格式的表：
| ID | pid | catename | cateorder | createtime |
|---|---|---|---|---|
| 1 | 0 | 新闻 | 0 | 0 |
| 2 | 0 | 图片 | 0 | 0 |
| 3 | 1 | 国内新闻 | 0 | 0 |
| 4 | 1 | 国际新闻 | 0 | 0 |
| 5 | 3 | 北京新闻 | 0 | 0 |
| 6 | 4 | 美国新闻 | 0 | 0 |
| 7 | 2 | 美女图片 | 0 | 0 |
| 8 | 2 | 风景图片 | 0 | 0 |
create table deepcate
(
id int(10) unsigned not null auto_increment primary key,
pid int(11) unsigned not null,
catename varchar(30) not null,
cateorder int(11) unsigned default 0,
createtime int(10) not null
);
insert into deepcate(pid,catename,cateorder,createtime)values(0,'新闻',0,0);
insert into deepcate(pid,catename,cateorder,createtime)values(0,'图片',0,0);
insert into deepcate(pid,catename,cateorder,createtime)values(1,'国内新闻',0,0);
insert into deepcate(pid,catename,cateorder,createtime)values(1,'国际新闻',0,0);
insert into deepcate(pid,catename,cateorder,createtime)values(3,'北京新闻',0,0);
insert into deepcate(pid,catename,cateorder,createtime)values(4,'美国新闻',0,0);
insert into deepcate(pid,catename,cateorder,createtime)values(2,'美女图片',0,0);
insert into deepcate(pid,catename,cateorder,createtime)values(2,'风景图片',0,0);
insert into deepcate(pid,catename,cateorder,createtime)values(7,'日韩明星',0,0);
insert into deepcate(pid,catename,cateorder,createtime)values(9,'日本AV',0,0);
select * from deepcate;
php 代码实现
";
foreach($rs as $v){
if($v['id']==$selected){
$selected="selected";
}
$str.="";
}
return $str.= "";
}
echo displayCate();
echo "
";
function getCatePath($cid,&$result){
$sql="SELECT * FROM deepcate WHERE id=$cid ";
$rs=mysql_query($sql);
$row=mysql_fetch_assoc($rs);
if($row){
$result[]=$row;
getCatePath($row['pid'],$result);
}
krsort($result);
return $result;
}
function displayCatePath($cid,$url="deepcate.php?cid="){
$res=getCatePath($cid,$result);
$str="";
foreach($res as $v){
$str.= "{$v['catename']}>>";
}return $str;
}
echo displayCatePath(10);
二、全路径实现
use imooc;
create table likecate
(
id int(11) not null auto_increment primary key,
path varchar(200) not null,
catename varchar(30) not null,
cateorder int(11) not null default 0,
createtime int(11) not null
);
insert into likecate(path,catename,cateorder,createtime)values('','手机',0,0);
insert into likecate(path,catename,cateorder,createtime)values('1','功能手机',0,0);
insert into likecate(path,catename,cateorder,createtime)values('1,2','老人手机',0,0);
insert into likecate(path,catename,cateorder,createtime)values('1,2','儿童手机',0,0);
insert into likecate(path,catename,cateorder,createtime)values('1','智能手机',0,0);
insert into likecate(path,catename,cateorder,createtime)values('1,5','andriod手机',0,0);
insert into likecate(path,catename,cateorder,createtime)values('1,5','ios手机',0,0);
insert into likecate(path,catename,cateorder,createtime)values('1,5','winphoto手机',0,0);
insert into likecate(path,catename,cateorder,createtime)values('1,2,4','色盲手机',0,0);
insert into likecate(path,catename,cateorder,createtime)values('1,2,3','大字手机',0,0);
select * from likecate;
select id,catename,path,concat(path,',',id) as fullpath from likecate where 1 order by fullpath asc;
#结果显示如图
+----+--------------+-------+----------+
| id | catename | path | fullpath |
+----+--------------+-------+----------+
| 1 | 手机 | | ,1 |
| 2 | 功能手机 | 1 | 1,2 |
| 3 | 老人手机 | 1,2 | 1,2,3 |
| 10 | 大字手机 | 1,2,3 | 1,2,3,10 |
| 4 | 儿童手机 | 1,2 | 1,2,4 |
| 9 | 色盲手机 | 1,2,4 | 1,2,4,9 |
| 5 | 智能手机 | 1 | 1,5 |
| 6 | andriod手机 | 1,5 | 1,5,6 |
| 7 | ios手机 | 1,5 | 1,5,7 |
| 8 | winphoto手机 | 1,5 | 1,5,8 |
+----+--------------+-------+----------+
php代码实现
";
foreach($res as $v){
echo "";
}
echo "";
echo "
";
function getPathCate($cateid){
$sql="select *,concat(path,',',id)fullpath from likecate where id=$cateid";
$res=mysql_query($sql);
$row=mysql_fetch_assoc($res);
$ids=$row['fullpath'];
$sql="select * from likecate where id in($ids) order by id asc";
$res=mysql_query($sql);
$result=array();
while($row=mysql_fetch_assoc($res)){
$result[]=$row;
}
return $result;
}
function displayCatePath($cateid,$link='likecate.php?cid='){
$res=getPathCate($cateid);
$str="";
foreach($res as $v){
$str.="{$v['catename']}>";
}
return $str;
}
echo displayCatePath(4,'likecate.php?p=1&cid=');