这个月我们新开发了一个项目，由于使用到了4台机器做web，使用dns做负载均衡，

1. <?php  
2.     /*
3.      *用redis实现跨服务器session  
4.      *注意需要安装phpredis模块  
5.      *  
6.      *作者:yifangyou  
7.      *日期:2012-07-23 22:55:00  
8.     **/ 
9. class RedisSession{  
10.     var $expire=86400;//过期时间  
11.     var $sso_session;//session id  
12.     var $session_folder;//session目录  
13.     var $cookie_name;//cookie的名字  
14.     var $redis;//redis连接  
15.     var $cache;//缓存session  
16.     var $expireAt;//过期时间  
17.     /*
18.      *初始化  
19.      *参数  
20.      *$redis:php_redis的类实例  
21.      *$cookie_name:cookie的名字  
22.      *$session_id_prefix:sesion id的前缀  
23.     **/ 
24.     function RedisSession($redis,$expire=86400,$cookie_name="sso_session",$session_id_prefix=""){  
25.         $this->redis=$redis;  
26.         $this->cookie_name=$cookie_name;  
27.         $this->session_folder="sso_session:";  
28.     //若是cookie已经存在则以它为session的id  
29.         if(isset($_COOKIE[$this->cookie_name])){  
30.              $this->sso_session=$_COOKIE[$this->cookie_name];  
31.         }else{  
32.             $this->expire=$expire;  
33.             $this->expireAt=time()+$this->expire;  
34.          //在IE6下的iframe无法获取到cookie,于是我使用了get方式传递了cookie的名字  
35.             if(isset($_GET[$this->cookie_name])){  
36.                     $this->sso_session=$_GET[$this->cookie_name];  
37.             }else{  
38.                     $this->sso_session=$this->session_folder.$session_prefix.md5(uniqid(rand(), true));      
39.             }  
40.             setcookie($this->cookie_name,$this->sso_session,$this->expireAt,"/");  
41.         }  
42.     }  
43.       
44.     /*
45.      *设置过期时间  
46.      *参数  
47.     **/ 
48.     function expire($expire=86400){  
49.             $this->expire=$expire;  
50.             $this->expireAt=time()+$this->expire;  
51.             //设置session过期时间  
52.             setcookie($this->cookie_name,$this->sso_session,$this->expireAt,"/",".greatwallwine.com.cn");  
53.             $this->redis->expireAt($this->sso_session, $this->expireAt);  
54.     }  
55.       
56.     /*
57.      *设置多个session的值  
58.      *参数  
59.      *$array:值  
60.     **/ 
61.     function setMutil($array){  
62.         $this->redis->hMset($this->sso_session,$array);  
63.     }  
64.     /*
65.      *设置session的值  
66.      *参数  
67.      *$key:session的key  
68.      *$value:值  
69.     **/ 
70.     function set($key,$value){  
71.         $this->redis->hSet($this->sso_session,$key,$value);  
72.     }  
73.     /*
74.      *设置session的值为对象  
75.      *参数  
76.      *$key:session的key  
77.      *$object:对象  
78.     **/ 
79.     function setObject($key,$object){  
80.         $this->redis->hSet($this->sso_session,$key,serialize($object));  
81.     }  
82.       
83.     /*
84.      *获取全部session的key和value  
85.      @return: array  
86.     **/ 
87.     function getAll(){  
88.         return $this->redis->hGetAll($this->sso_session);  
89.     }  
90.       
91.       
92.       
93.     /*
94.      *获取一个session的key和value  
95.      @return: array  
96.     **/ 
97.     function get($key){  
98.         return $this->redis->hGet($this->sso_session,$key);  
99.     }  
100.       
101.   /*
102.      *获取session的值为对象  
103.      *参数  
104.      *$key:session的key  
105.      *$value:cookie的名字  
106.     **/ 
107.     function getObject($key){  
108.         return unserialize($this->redis->hGet($this->sso_session,$key));  
109.     }  
110.     /*
111.      *从缓存中获取一个session的key和value  
112.      @return: array  
113.     **/ 
114.     function getFromCache($key){  
115.         if(!isset($this->cache)){  
116.             $this->cache=$this->getAll();  
117.         }  
118.         return $this->cache[$key];  
119.     }  
120.       
121.     /*
122.      *删除一个session的key和value  
123.      @return: array  
124.     **/ 
125.     function del($key){  
126.         return $this->redis->hDel($this->sso_session,$key);  
127.     }  
128.     /*
129.      *删除所有session的key和value  
130.      @return: array  
131.     **/ 
132.     function delAll(){  
133.         return $this->redis->delete($this->sso_session);  
134.     }  
135. }  
136. ?> 

使用方法：

1. <?php  
2. error_reporting(0);  
3. $redisHost="192.168.1.2";  
4. $redisPort="6379";  
5. $redis = new Redis();  
6. $redis->connect($redisHost,$redisPort);  
7. include_once("inc/RedisSession.php");  
8. $redisSession=new RedisSession($redis);  
9. /*
10. $redisSession->set("name","sdf4");  
11. $redisSession->set("age",1234);  
12. $redisSession->set("***","man14");  
13. $redisSession->set("name","abc4");  
14. $redisSession->setMutil(array("province"=>"guangdong","city"=>"guangzhou"));  
15. */ 
16.  
17. $redisSession->setObject("obj",array("test1"=>array("test2")));  
18. $obj=$redisSession->getObject("obj");  
19. print_r($obj);  
20. die();  
21. print_r($redisSession->getAll());  
22. //$redisSession->del("name");  
23. print_r($redisSession->get("name"));  
24. //print_r($redisSession->get("province"));  
25. //$redisSession->delAll();  
26. //print_r($redisSession->getAll());  
27. print_r($redisSession->getFromCache("name"));  
28. /*
29.     $redisSession->del("name");  
30.     $redisSession->delAll();  
31. */ 

end