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b5cw
9年前发布

php+redis缓存类

php+redis缓存类

    <?php                  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 '<div style="color:red;">'.$str.'</div>';           }        }                          //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                                   ?>