PHP实现的Redis多库选择功能单例类

本文实例讲述了php实现的Redis多库选择功能单例类。分享给大家供大家参考，具体如下：

前言

qq群里有同学问redis如何进行多库选择,用php实现了一下,还望各位多多指点

代码

<?phpclass MultiRedisConnect{  /**   * hostname   *   * @var string   */  const REDISHOSTNAME = "127.0.0.1";  /**   * port   *   * @var int   */  const REDISPORT = 6379;  /**   * timeout   *   * @var int   */  const REDISTIMEOUT = 0;  /**   * password   *   * @var string   */  const REDISPASSWORD = "123456";  /**   * 类单例数组   *   * @var array   */  private static $instance = array();  /**   * redis连接句柄   *   * @var object   */  private $redis;  /**   * hash的key   *   * @var int   */  private $hash;  /**   * 私有化构造函数,防止类外实例化   *   * @param int $dbnumber   */  private function __construct ($dbnumber)  {    $dbnumber = (int) $dbnumber;    $this->hash = $dbnumber;    $this->redis = new Redis();    $this->redis->connect(self::REDISHOSTNAME, self::REDISPORT, self::REDISTIMEOUT);    $this->redis->auth(self::REDISPASSWORD);    $this->redis->select($dbnumber);  }  private function __clone ()  {}  /**   * 获取类单例   *   * @param int $dbnumber   * @return object   */  public static function getRedisInstance ($dbnumber)  {    $hash = (int) $dbnumber;    if (! isset(self::$instance[$hash])) {      self::$instance[$hash] = new MultiRedisConnect($dbnumber);    }    return self::$instance[$hash];  }  /**   * 获取redis的连接实例   *   * @return object   */  public function getRedisConnect ()  {    return $this->redis;  }  /**   * 关闭单例时做清理工作   */  public function __destruct ()  {    $key = $this->hash;    self::$instances[$key]->redis->close();    self::$instances[$key] = null;  }}?>