Redis 笔记与总结8 PHP + Redis 信息管理系统(分页+好友关注)

分页

要对列表页进行分页,需要知道:

①用户总数 $count

② 页大小 $pageSize:用户自定义

③ 当前页:$page:GET 方式获取  

④ 总页数:$pageCount = ceil($count / $pageSize)

关键是用户总数 $count 的获取:

可以采取的方案是,在用户注册时,把 uid 存入链表,统计链表中用户 uid 的个数,即为用户总数 $count

【操作】

reg.php:(line 14)

 1 <?php
 2 require 'redis.php';
 3 
 4 $username = $_POST['username']; 
 5 $password = md5($_POST['password']); 
 6 $age =$_POST['age']; 
 7 //uid 自加 
 8 //当有 userid 这个键时,执行 incr时该键的值加1;不存在该键时,创建一个 userid,值为0,执行incr,值为1
 9 $uid = $redis->incr('userid');
10 
11 //向 hash 表中批量添加数据:hMset 
12 $redis->hMset('user:'.$uid, array('uid'=>$uid, 'name'=>$username, 'password'=>$password, 'age'=>$age));
13 //把用户 id 存入链表
14 $redis->rpush('uid', $uid);
15 
16 //跳转
17 header('location:list.php');

 

在 redis 客户端 flushdb 清除一下数据库,重新注册用户;

注册了 9 个用户:

127.0.0.1:6379>  keys *
 1) "user:1"
 2) "user:4"
 3) "user:7"
 4) "user:3"
 5) "user:6"
 6) "uid"
 7) "user:8"
 8) "user:5"
 9) "user:9"
10) "user:2"
11) "userid"

key 为 uid 的键即是保存用户 uid 的链表:

127.0.0.1:6379> type uid
list
127.0.0.1:6379> lrange uid 0 -1
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
6) "6"
7) "7"
8) "8"
9) "9"

 

前台:

 

删除用户时,同时删除链表结构中的对应的用户的 uid

del.php(line:7):

1 <?php
2 require 'redis.php';
3 
4 $uid = $_GET['uid'];
5 $redis->del('user:'.$uid);
6 //删除链表中的用户 uid
7 $redis->lrem('uid', $uid);
8 
9 header('location:list.php');

删除其中一个用户(例如秦明),在 redis 客户端获取 list uid:

127.0.0.1:6379> lrange uid 0 -1
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
6) "6"
7) "7"
8) "9"

uid 为 8 的值已经被删掉了。

 

在 list.php 中可以通过 $resid->lsize('uid'); 来获取 key 为 uid 的链表元素的个数(line:15),同时修改 for 循环为 foreach 循环(line:36),分页(line:13):

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>用户信息列表</title>
 6 </head>
 7 <body>
 8     <a href="add.php">返回注册页面</a>
 9     <a href="login.php">登录</a>
10 <?php
11 require 'redis.php';
12 
13 /*分页*/
14 //用户总数
15 $count = $redis->lsize('uid');
16 //页大小 
17 $pageSize = 5;
18 //当前页码
19 $page = !empty($_GET['page'])?$_GET['page']:1;
20 //页总数
21 $pageCount = ceil($count / $pageSize);
22 
23 /*
24 第 1 页:lrange 0 4
25 第 2 页:lrange 5 9
26 第 3 页:lrange 10 14
27 第 n 页:lrange ($page - 1) * $pageSize    ($page - 1) * $pageSize + ($pageSize - 1)
28 */
29 $ids = $redis->lrange('uid', (($page - 1) * $pageSize), (($page - 1) * $pageSize + ($pageSize - 1)));
30 /*
31 var_dump($ids); 
32 $page = 1
33 array(5) { [0]=> string(1) "1" [1]=> string(1) "2" [2]=> string(1) "3" [3]=> string(1) "4" [4]=> string(1) "5" }
34 */
35 
36 foreach($ids as $v){
37     $data[] = $redis->hgetall('user:'.$v);
38 }
39 ?>
40 <table border="1" cellspacing="0" cellpadding="5">
41     <tr>
42         <th>uid</th>
43         <th>name</th>
44         <th>age</th>
45         <th>操作</th>
46     </tr>
47     <?php foreach($data as $v){ ?>
48     <tr>
49         <td><?php echo $v['uid']?></td>
50         <td><?php echo $v['name']?></td>
51         <td><?php echo $v['age']?></td>
52         <td><a href="del.php?uid=<?php echo $v['uid'];?>">删除</a> | <a href="mod.php?uid=<?php echo $v['uid'];?>">编辑</a></td>
53     </tr>
54     <?php } ?>
55     <tr><td colspan="4">
56             <a href="?page=<?php echo ($page-1)<=1?1:($page-1);?>">上一页</a>
57             <a href="?page=<?php echo ($page+1)>$pageCount?$pageCount:($page+1);?>">下一页 </a>
58             <a href="?page=1">首页</a>
59             <a href="?page=<?php echo $pageCount;?>">尾页</a>
60             当前<?php echo $page;?>61             总共<?php echo $pageCount;?>62             共<?php echo $count;?>用户
63         </td>
64     </tr>
65 </table>
66 </body>
67 </html>

前台:

 

 

登录

需要判断用户输入的用户名是否已经注册,实现的方法是:在用户注册的时候把用户名存入字符串,修改 reg.php(注册):

reg.php(line:15):

 1 <?php
 2 require 'redis.php';
 3 
 4 $username = $_POST['username']; 
 5 $password = md5($_POST['password']); 
 6 $age =$_POST['age']; 
 7 //uid 自加 
 8 //当有 userid 这个键时,执行 incr时该键的值加1;不存在该键时,创建一个 userid,值为0,执行incr,值为1
 9 $uid = $redis->incr('userid');
10 
11 //向 hash 表中批量添加数据:hMset 
12 $redis->hMset('user:'.$uid, array('uid'=>$uid, 'name'=>$username, 'password'=>$password, 'age'=>$age));
13 //把用户 id 存入链表
14 $redis->rpush('uid', $uid);
15 //把用户名 name 存入字符串
16 $redis->set('username:'.$username, $uid);
17 
18 //跳转
19 header('location:list.php');

在 redis 客户端 flushdb 清空数据库,重新注册;

 

增加 login.php:

 1 <?php 
 2     header("content-type:text/html;charset=utf-8");
 3     require 'redis.php';
 4     if(isset($_POST) && !empty($_POST)){
 5         $username = $_POST['username'];
 6         $pass = $_POST['password'];
 7         //判断用户民是否存在
 8         $id = $redis->get('username:'.$username);
 9         if(!empty($id)){
10             //用户存在,对比密码
11             $password = $redis->hget('user:'.$id, 'password');
12             if(md5($pass) == $password){
13                 $auth = md5(time().$username.rand());
14                 $redis->set('auth:'.$auth, $id);
15                 setcookie('auth', $auth, time()+86400);
16                 header('location:list.php');
17             }
18         }
19     }else{
20 ?>
21 <!DOCTYPE html>
22 <html lang="en">
23 <head>
24     <meta charset="UTF-8">
25     <title>Document</title>
26 </head>
27 <body>
28     <form action="" method="post">
29         <table align="left">
30             <tr><td>用户名:</td><td><input type="username" name="username"></td></tr>
31             <tr><td>密码:</td><td><input type="password" name="password"></td></tr>
32             <tr><td><input type="submit" value="登录"></td><td><input type="reset" value="重置"></td></tr>
33         </table>
34     </form>
35 </body>
36 </html>
37 <?php }?>

 

修改 list.php,增加 “退出”,“欢迎+用户名”:

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>用户信息列表</title>
 6 </head>
 7 <body>
 8     <a href="add.php">返回注册页面</a>
 9     <?php 
10         require 'redis.php';
11         if(!empty($_COOKIE['auth'])){
12             //获取 id
13             $id = $redis->get('auth:'.$_COOKIE['auth']);
14             //获取用户名
15             $name = $redis->hget('user:'.$id, 'name');
16             echo '&nbsp;&nbsp;欢迎你, ',$name;
17             echo '&nbsp;&nbsp;<a href="logout.php">退出</a>';
18         }else{
19     ?>
20     <a href="login.php">登录</a>
21     <?php }?>
22 <?php
23 /*分页*/
24 //用户总数
25 $count = $redis->lsize('uid');
26 //页大小 
27 $pageSize = 5;
28 //当前页码
29 $page = !empty($_GET['page'])?$_GET['page']:1;
30 //页总数
31 $pageCount = ceil($count / $pageSize);
32 
33 /*
34 第 1 页:lrange 0 4
35 第 2 页:lrange 5 9
36 第 3 页:lrange 10 14
37 第 n 页:lrange ($page - 1) * $pageSize    ($page - 1) * $pageSize + ($pageSize - 1)
38 */
39 $ids = $redis->lrange('uid', (($page - 1) * $pageSize), (($page - 1) * $pageSize + ($pageSize - 1)));
40 /*
41 var_dump($ids); 
42 $page = 1
43 array(5) { [0]=> string(1) "1" [1]=> string(1) "2" [2]=> string(1) "3" [3]=> string(1) "4" [4]=> string(1) "5" }
44 */
45 
46 foreach($ids as $v){
47     $data[] = $redis->hgetall('user:'.$v);
48 }
49 ?>
50 <table border="1" cellspacing="0" cellpadding="5">
51     <tr>
52         <th>uid</th>
53         <th>name</th>
54         <th>age</th>
55         <th>操作</th>
56     </tr>
57     <?php foreach($data as $v){ ?>
58     <tr>
59         <td><?php echo $v['uid']?></td>
60         <td><?php echo $v['name']?></td>
61         <td><?php echo $v['age']?></td>
62         <td><a href="del.php?uid=<?php echo $v['uid'];?>">删除</a> | <a href="mod.php?uid=<?php echo $v['uid'];?>">编辑</a></td>
63     </tr>
64     <?php } ?>
65     <tr><td colspan="4">
66             <a href="?page=<?php echo ($page-1)<=1?1:($page-1);?>">上一页</a>
67             <a href="?page=<?php echo ($page+1)>$pageCount?$pageCount:($page+1);?>">下一页 </a>
68             <a href="?page=1">首页</a>
69             <a href="?page=<?php echo $pageCount;?>">尾页</a>
70             当前<?php echo $page;?>71             总共<?php echo $pageCount;?>72             共<?php echo $count;?>用户
73         </td>
74     </tr>
75 </table>
76 </body>
77 </html>

 

此时在 redis 客户端产看所有的 key:

127.0.0.1:6379> keys *
 1) "user:4"
 2) "user:1"
 3) "user:6"
 4) "user:3"
 5) "uid"
 6) "username:\xe5\x90\x89\xe5\xb8\x83\xe6\x96\xaf"
 7) "username:\xe5\x88\x87\xe8\xb5\xab"
 8) "auth:d3716d28fd2491c1983fc6bb4087c05b"
 9) "user:5"
10) "username:\xe9\xbb\x98\xe5\xbe\xb7\xe8\x90\xa8\xe5\x85\x8b"
11) "userid"
12) "user:2"
13) "username:\xe5\xbe\xb7\xe5\xb8\x83\xe8\xa5\xbf"
14) "username:\xe5\x85\x8b\xe6\x96\xaf\xe5\x88\x87\xe5\xb0\x94\xe5\xb0\xbc"
15) "username:\xe5\x8a\xa0\xe5\xb8\x83\xe9\x87\x8c\xe5\x9f\x83\xe5\xb0\x94"

用户列表前台:

 

 

退出

logout.php:

1 <?php
2 setcookie('auth', '', time()-1);
3 header('location:list.php');

 

 

加关注

修改 list.php(列表界面 line:64)

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>用户信息列表</title>
 6 </head>
 7 <body>
 8     <a href="add.php">返回注册页面</a>
 9     <?php 
10         require 'redis.php';
11         if(!empty($_COOKIE['auth'])){
12             //获取 id
13             $id = $redis->get('auth:'.$_COOKIE['auth']);
14             //获取用户名
15             $name = $redis->hget('user:'.$id, 'name');
16             echo '&nbsp;&nbsp;欢迎你, ',$name;
17             echo '&nbsp;&nbsp;<a href="logout.php">退出</a>';
18         }else{
19     ?>
20     <a href="login.php">登录</a>
21     <?php }?>
22 <?php
23 /*分页*/
24 //用户总数
25 $count = $redis->lsize('uid');
26 //页大小 
27 $pageSize = 5;
28 //当前页码
29 $page = !empty($_GET['page'])?$_GET['page']:1;
30 //页总数
31 $pageCount = ceil($count / $pageSize);
32 
33 /*
34 第 1 页:lrange 0 4
35 第 2 页:lrange 5 9
36 第 3 页:lrange 10 14
37 第 n 页:lrange ($page - 1) * $pageSize    ($page - 1) * $pageSize + ($pageSize - 1)
38 */
39 $ids = $redis->lrange('uid', (($page - 1) * $pageSize), (($page - 1) * $pageSize + ($pageSize - 1)));
40 /*
41 var_dump($ids); 
42 $page = 1
43 array(5) { [0]=> string(1) "1" [1]=> string(1) "2" [2]=> string(1) "3" [3]=> string(1) "4" [4]=> string(1) "5" }
44 */
45 
46 foreach($ids as $v){
47     $data[] = $redis->hgetall('user:'.$v);
48 }
49 ?>
50 <table border="1" cellspacing="0" cellpadding="5">
51     <tr>
52         <th>uid</th>
53         <th>name</th>
54         <th>age</th>
55         <th>操作</th>
56     </tr>
57     <?php foreach($data as $v){ ?>
58     <tr>
59         <td><?php echo $v['uid']?></td>
60         <td><?php echo $v['name']?></td>
61         <td><?php echo $v['age']?></td>
62         <td align="center"><a href="del.php?uid=<?php echo $v['uid'];?>">删除</a> 
63         | <a href="mod.php?uid=<?php echo $v['uid'];?>">编辑</a>
64         <!-- 用户登录,列表中除自己之外的用户 都显示“加关注”-->
65         <?php if(!empty($_COOKIE['auth']) && $id != $v['uid']){ ?>| <a href="addAttention.php?id=<?php echo $v['uid'];?>&uid=<?php echo $id;?>">加关注</a><?php }?></td>
66     </tr>
67     <?php } ?>
68     <tr><td colspan="4">
69             <a href="?page=<?php echo ($page-1)<=1?1:($page-1);?>">上一页</a>
70             <a href="?page=<?php echo ($page+1)>$pageCount?$pageCount:($page+1);?>">下一页 </a>
71             <a href="?page=1">首页</a>
72             <a href="?page=<?php echo $pageCount;?>">尾页</a>
73             当前<?php echo $page;?>74             总共<?php echo $pageCount;?>75             共<?php echo $count;?>用户
76         </td>
77     </tr>
78 </table>
79 </body>
80 </html>

 

加关注用集合(set,有并集、交集、差集——可以实现共同关注、好友推荐(a 关注了,但是 b 没有关注,a 给 b 的好友推荐))来存储

addAttenation.php:

 1 <?php
 2 require 'redis.php';
 3 
 4 //待加关注的用户id
 5 $id = $_GET['id'];
 6 //用户id
 7 $uid = $_GET['uid'];
 8 
 9 //当前用户 uid 正在following(关注)id
10 $redis->sadd('user:'.$uid.':following', $id);
11 //用户id的followers(粉丝):uid
12 $redis->sadd('user:'.$id.':followers', $uid);
13 
14 header('location:list.php');

 

添加完关注以后,在 redis 客户端:

127.0.0.1:6379> keys *
 1) "user:4"
 2) "user:1:followers"
 3) "user:3"
 4) "user:6"
 5) "auth:a6ce443729f3d524f81c2bdcdba60278"
 6) "uid"
 7) "auth:556734b6f86b074b921349d616393c2e"
 8) "username:\xe5\x88\x87\xe8\xb5\xab"
 9) "user:2:followers"
10) "user:2"
11) "userid"
12) "user:1:following"
13) "auth:28e59ffccd991262bfb1b92c027a69ea"
14) "username:\xe5\xbe\xb7\xe5\xb8\x83\xe8\xa5\xbf"
15) "user:1"
16) "user:5:followers"
17) "username:\xe5\x90\x89\xe5\xb8\x83\xe6\x96\xaf"
18) "user:3:followers"
19) "user:5"
20) "auth:d3716d28fd2491c1983fc6bb4087c05b"
21) "username:\xe9\xbb\x98\xe5\xbe\xb7\xe8\x90\xa8\xe5\x85\x8b"
22) "auth:a2a03ba9c65d1716d7f19726372f83f7"
23) "user:2:following"
24) "user:4:followers"
25) "auth:8ae6684aecf41ee7259a288aaecca964"
26) "username:\xe5\x8a\xa0\xe5\xb8\x83\xe9\x87\x8c\xe5\x9f\x83\xe5\xb0\x94"
27) "username:\xe5\x85\x8b\xe6\x96\xaf\xe5\x88\x87\xe5\xb0\x94\xe5\xb0\xbc"
127.0.0.1:6379> smembers user:1:following 1) "2" 2) "4" 3) "5"
127.0.0.1:6379> smembers user:1:followers 1) "2" 127.0.0.1:6379> smembers user:2:following 1) "1" 2) "3" 3) "4"
127.0.0.1:6379> smembers user:2:followers 1) "1"
127.0.0.1:6379> sdiff user:1:following user:2:following #user:1 和 user:2 关注的差集,可以user:1 可以向 user:2 推荐好友 1) "2" 2) "5"

 

 

我的关注

修改 list.php(line:79):

 1 <!DOCTYPE html>
 2 <html lang="en">
 3 <head>
 4     <meta charset="UTF-8">
 5     <title>用户信息列表</title>
 6 </head>
 7 <body>
 8     <a href="add.php">返回注册页面</a>
 9     <?php 
10         require 'redis.php';
11         if(!empty($_COOKIE['auth'])){
12             //获取 id
13             $id = $redis->get('auth:'.$_COOKIE['auth']);
14             //获取用户名
15             $name = $redis->hget('user:'.$id, 'name');
16             echo '&nbsp;&nbsp;欢迎你, ',$name;
17             echo '&nbsp;&nbsp;<a href="logout.php">退出</a>';
18         }else{
19     ?>
20     <a href="login.php">登录</a>
21     <?php }?>
22 <?php
23 /*分页*/
24 //用户总数
25 $count = $redis->lsize('uid');
26 //页大小 
27 $pageSize = 5;
28 //当前页码
29 $page = !empty($_GET['page'])?$_GET['page']:1;
30 //页总数
31 $pageCount = ceil($count / $pageSize);
32 
33 /*
34 第 1 页:lrange 0 4
35 第 2 页:lrange 5 9
36 第 3 页:lrange 10 14
37 第 n 页:lrange ($page - 1) * $pageSize    ($page - 1) * $pageSize + ($pageSize - 1)
38 */
39 $ids = $redis->lrange('uid', (($page - 1) * $pageSize), (($page - 1) * $pageSize + ($pageSize - 1)));
40 /*
41 var_dump($ids); 
42 $page = 1
43 array(5) { [0]=> string(1) "1" [1]=> string(1) "2" [2]=> string(1) "3" [3]=> string(1) "4" [4]=> string(1) "5" }
44 */
45 
46 foreach($ids as $v){
47     $data[] = $redis->hgetall('user:'.$v);
48 }
49 ?>
50 <table border="1" cellspacing="0" cellpadding="5">
51     <tr>
52         <th>uid</th>
53         <th>name</th>
54         <th>age</th>
55         <th>操作</th>
56     </tr>
57     <?php foreach($data as $v){ ?>
58     <tr>
59         <td><?php echo $v['uid']?></td>
60         <td><?php echo $v['name']?></td>
61         <td><?php echo $v['age']?></td>
62         <td align="center"><a href="del.php?uid=<?php echo $v['uid'];?>">删除</a> 
63         | <a href="mod.php?uid=<?php echo $v['uid'];?>">编辑</a>
64         <!-- 用户登录,列表中除自己之外的用户 都显示“加关注”-->
65         <?php if(!empty($_COOKIE['auth']) && $id != $v['uid']){ ?>| <a href="addAttention.php?id=<?php echo $v['uid'];?>&uid=<?php echo $id;?>">加关注</a><?php }?></td>
66     </tr>
67     <?php } ?>
68     <tr><td colspan="4">
69             <a href="?page=<?php echo ($page-1)<=1?1:($page-1);?>">上一页</a>
70             <a href="?page=<?php echo ($page+1)>$pageCount?$pageCount:($page+1);?>">下一页 </a>
71             <a href="?page=1">首页</a>
72             <a href="?page=<?php echo $pageCount;?>">尾页</a>
73             当前<?php echo $page;?>74             总共<?php echo $pageCount;?>75             共<?php echo $count;?>用户
76         </td>
77     </tr>
78 </table>
79 <table cellspacing="0" cellpadding="2" border="1">
80     <caption>我的关注</caption>
81     <?php 
82         $data = $redis->smembers('user:'.$id.':following');
83         foreach ($data as $value) {
84             $row = $redis->hgetall('user:'.$value);
85     ?>
86         <tr>
87             <td><?php echo $row['uid'];?></td>
88             <td><?php echo $row['name'];?></td>
89             <td><?php echo $row['age'];?></td>
90         </tr>
91     <?php
92         }
93     ?>
94 </table>
95 </body>
96 </html>

前台显示:

粉丝同理。

 

总结:

统计用户总数可以把用户 uid 以链表(list)结构存储;判断用户是否已经注册可以把用户名以字符串(string)类型存储;统计用户的关注、粉丝以及推荐好友可以使用集(set)数据类型。

posted @ 2015-07-01 00:41  nemo20  阅读(2711)  评论(0编辑  收藏  举报
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