php+redis cache class

php+redis缓存类

    class redisCache {
       /**
        * $host : redis服务器ip
        * $port : redis服务器端口
        * $lifetime : 缓存文件有效期,单位为秒
        * $cacheid : 缓存文件路径,包含文件名
       */
       private $host;
       private $port;
       private $lifetime;
       private $cacheid;
       private $data;
       public $redis;
       /**
        * 析构函数,检查缓存目录是否有效,默认赋值
       */
       function __construct($lifetime=1800) {
            //配置
            $this->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);
       }


       /**
        * 检查缓存是否有效
       */
       private function isvalid(){
           $data=$this->data;
           if (!$data['content']) return false;
           if (time() - $data['creattime'] > $this->lifetime) return false;
           return true;
       }
       /**
        * 写入缓存
        * $mode == 0 , 以浏览器缓存的方式取得页面内容
       */
       public function write($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) {
               $this->error('写入缓存失败!');
           }
       }
       /**
        * 加载缓存
        * exit() 载入缓存后终止原页面程序的执行,缓存无效则运行原页面程序生成缓存
        * ob_start() 开启浏览器缓存用于在页面结尾处取得页面内容
       */
       public function load() {
           if ($this->isvalid()) {
               echo $this->data['content'];
               exit();
           }
           else {
               ob_start();
           }
       }
       /**
        * 清除缓存
       */
       public function clean() {
           try {
               $this->redis->hDel($this->cacheid, array('content','creattime'));
           }
           catch (Exception $e) {
               $this->error('清除缓存失败!');
           }
       }
       /**
        * 取得缓存文件路径
       */
       private function getcacheid() {
           return $this->dir.md5($this->geturl()).$this->ext;
       }
       /**
        * 取得当前页面完整url
       */
       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 $url;
       }
       /**
        * 输出错误信息
       */
       private function error($str) {
           echo ''.$str.'';
 }
 }


 //Usage:
 // require_once('redisCache.php');
 // $cache = new redisCache(10); //Set cache lifetime
 // if ($ _GET['clearCache']) $cache->clean();
 // else $cache->load(); //Load cache. If the cache is valid, the following page code will not be executed.
 // //Start of page code

 // //End of page code
 // $cache->write(); // First run or cache expiration, generate cache



 ?>

php, redis

This topic was moved by Xiaobei on 2015-11-12 08:43