/**
* 
*/
class _redis_{
    PRivate $redis;
    private static $connections = array(); //定义一个对象池 
    private static $servers = array(); //定义redis配置文件 
    public static function addServer($conf){//定义添加redis配置方法 
    foreach ($conf as $name => $data){
        self::$servers[$name]=$data;
    }
} 
public static function getRedis($name,$select = 0){
    //两个参数要连接的服务器KEY,要选择的库 
    if(!array_key_exists($name,self::$connections)){ 
    //判断连接池中是否存在 
        $redis = new Redis(); 
        $redis->connect(self::$servers[$name][0],self::$servers[$name][1]);
        self::$connections[$name]=$redis; 
        if(isset(self::$servers[$name][2]) && self::$servers[$name][2]!=""){ 
            self::$connections[$name]->auth(self::$servers[$name][2]); 
        } 
    } 
    self::$connections[$name]->select($select);
    return self::$connections[$name]; 
}
}