Redis----计算好友关注关系

class Friend{  
            public $flag = "";      #存储当前对象的标志信息  
            public $redis = "";     #redis对象成员  
  
            function __construct($name){  
                $this->flag = $name;  
            }  
  
            function getRd(){       #实例化redis对象  
                //实例化redis对象并连接redis服务  
                $this->redis  = new Redis();  
                $this->redis -> connect('192.168.9.38',6379);  
                $this->redis -> select(9);  
                return $this->redis;  
            }  
  
            function follow($user){ #实现关注效果  
                //redis对象->sadd(本人，$user);  
                //$this->getRd()->sadd(本人key，$user);  
                $this->getRd()->sadd("user:{$this->flag}:follow", $user);  
            }  
  
            function following(){   #获得关注全部人员的信息  
                //获得当前作者本人关注的全部对象信息  
                //redis对象->smember(本人)  
                return $this->getRd()->smembers("user:{$this->flag}:follow");  
            }  
  
            function isfollow($user){   #判断是否关注该用户  
            return $this->getRd()->sismember("user:{$this->flag}:follow",$user);  
            }  
  
            function follow_common($user){  #获得共同关注好友信息  
            //当前用户与指定用户共同关注好友信息  
            return $this->getRd()->sinter("user:{$this->flag}:follow","user:{$user}:follow");    
            }  
        }  
  
            $user1 = new Friend(1);  
            $user1 -> follow(3);  
            $user1 -> follow(4);  
            $user1 -> follow(5);  
            $user1 -> follow(7);  
            $user1 -> follow(9);  
  
            $user2 = new Friend(2);  
            $user2 -> follow(3);  
            $user2 -> follow(4);  
            $user2 -> follow(5);  
            $user2 -> follow(11);  
            $user2 -> follow(100);  
            $user2 -> follow(130);  
              
            echo "user1:following:";  
            print_r($user1->following());  
            print_r($user1->isfollow(3));  
            var_dump($user1->isfollow(13));  
            print_r($user1->follow_common(2));