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.' ';
- }
- }
-
-
- //用法:
- // require_once('redisCache.php');
- // $cache = new redisCache(10 ); //設定快取生存期
- // if ($_GET['clearCache']) $cache->clean();
- // else $cache->load(); //載入快取,快取有效則不執行以下頁面代碼
- // //頁面代碼開始
-
- // //頁面代碼結束
- // $cache->write(); //首次運行或緩存過期,產生快取
-
-
-
- ?>
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php, redis
本主題由 小貝 於 2015-11-12 08:43 移動