'SESSION_TYPE' => 'Redis', //session保存类型
'SESSION_PREFIX' => 'sess_', //session前缀
'REDIS_HOST' => '127.0.0.1' //REDIS服务器地址
'REDIS_PORT' => 6379, //REDIS连接端口号
'SESSION_EXPIRE' => 3600, //SESSION过期时间

<?php
namespace Think\Session\Driver;
class Redis {
//  Redis连接对象
  private $redis;
//  Session过期时间
  private $expire;
  /**
   * 打开方法
   * @param type $path
   * @param type $name
   * @return type
   */
  public function open($path, $name) {
  $this->expire = C('SESSION_EXPIRE') ? C('SESSION_EXPIRE') : ini_get('session.gc_maxLifetime');
  $this->redis = new Redis();
  return $this->redis->connect(C('REDIS_HOST'), C('REDIS_PORT'));
  }
  /**
   * 关闭
   * @return type
   */
  public function close() {
  return $this->redis->close();
  }
  /**
   * 读取
   * @param string $id
   * @return type
   */
  public function read($id) {
  $id = C('SESSION_PREFIX') . $id;
  $data = $this->redis->get($id);
  return $data ? $data : '';
  }
  /**
   * 写入
   * @param string $id
   * @param type $data
   * @return type
   */
  public function write($id, $data) {
  $id = C('SESSION_PREFIX') . $id;
  return $this->redis->set($id, $data, $this->expire);
  }
  /**
   * 销毁
   * @param string $id
   */
  public function destroy($id) {
  $id = C('SESSION_PREFIX') . $id;
  $this->redis->delete($id);
  }
  /**
   * 垃圾回收
   * @param type $maxLifeTime
   * @return boolean
   */
  public function gc($maxLifeTime) {
  return true;
  }
}