redis 替代php文件存储session的实例

class SessionManager {  private $redis;  public function __construct(){    $this->redis = new Redis();    $this->redis->connect('192.168.0.102', 6379);    $retval =session_set_save_handler(      array($this,"open"),      array($this,"close"),      array($this,"read"),      array($this,"write"),      array($this,"destroy"),      array($this,"gc")    );    session_start();  }  public function open($path,$name){    return true;  }  public function close(){    return true;  }  public function read($id){    $session_value = $this->redis->get($id);    if($session_value){      return $session_value;    }else{      return "";    }  }  public function write($id,$data){    if($this->redis->set($id,$data)){      return true;    }else{      return false;    }  }  public function destroy($id){    if($this->redis->delete($id)){      return true;    }else{      return false;    }  }  public function gc($maxlifetime){    return true;  }  public function __destruct(){    session_write_close();  }}

include("SessionManager.php");new SessionManager();$_SESSION['user_name']="xxdcsnd@sina.com";

include("SessionManager.php");new SessionManager();echo $_SESSION['user_name'];