php实现的redis缓存类定义与使用方法示例

本文实例讲述了php实现的redis缓存类定义与使用方法。分享给大家供大家参考，具体如下：

php+redis缓存类

host = "127.0.0.1";
    $this->port = "6379";
    $redis = new Redis();
    $redis->pconnect($this->host,$this->port);
    $this->redis=$redis;
    $this->cacheid = $this->getcacheid();
    $this->lifetime = $lifetime;
    $this->data=$redis->hMGet($this->cacheid, array('content','creattime'));
    //print_r($this->redis);
    //print_r($this->data);
  }
  
  private function isvalid(){
    $data=$this->data;
    if (!$data['content']) return false;
    if (time() - $data['creattime'] > $this->lifetime) return false;
    return true;
  }
  
  public function write($mode=0,$content='') {
    switch ($mode) {
      case 0:
 $content = ob_get_contents();
 break;
      default:
 break;
    }
    ob_end_flush();
    try {
      $this->redis->hMset($this->cacheid, array('content'=>$content,'creattime'=>time()));
      $this->redis->expireAt($this->cacheid, time() + $this->lifetime);
    }
    catch (Exception $e) {
      $this->error('写入缓存失败!');
    }
  }
  
  public function load() {
    if ($this->isvalid()) {
      echo $this->data['content'];
      exit();
    }
    else {
      ob_start();
    }
  }
  
  public function clean() {
    try {
      $this->redis->hDel($this->cacheid, array('content','creattime'));
    }
    catch (Exception $e) {
      $this->error('清除缓存失败!');
    }
  }
  
  private function getcacheid() {
    return $this->dir.md5($this->geturl()).$this->ext;
  }
  
  private function geturl() {
    $url = '';
    if (isset($_SERVER['REQUEST_URI'])) {
      $url = $_SERVER['REQUEST_URI'];
    }
    else {
      $url = $_SERVER['Php_SELF'];
      $url .= empty($_SERVER['QUERY_STRING'])?'':'?'.$_SERVER['QUERY_STRING'];
    }
    return $url;
  }
  
  private function error($str) {
    echo ''.$str.'';
  }
}
//用法：
// require_once('redisCache.php');
// $cache = new redisCache(10); //设置缓存生存期
// if ($_GET['clearCache']) $cache->clean();
// else $cache->load(); //装载缓存,缓存有效则不执行以下页面代码
// //页面代码开始
// //页面代码结束
// $cache->write(); //首次运行或缓存过期,生成缓存
?>

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希望本文所述对大家PHP程序设计有所帮助。