php 文件缓存

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class fileCache{        private $cachePath;    private $cacheFileName;    private $cacheFilePath;    private $expiresTime;    private $data="";        public function fileCache($cacheTime=10,$cachePath="cache/"){         $this->expiresTime=$cacheTime;        $this->cachePath=$cachePath;        $this->createCacheName();    }        public function setData($data){         $this->data=$data;    }        public function createCacheName(){        $url=$_SERVER['REQUEST_SCHEME']."://".$_SERVER['SERVER_NAME'].":".$_SERVER['SERVER_PORT'].$_SERVER['REQUEST_URI'];        $this->cacheFileName=md5($url);        $this->cacheFilePath=$this->cachePath.$this->cacheFileName.".php";    }            public function buildCache(){        ob_start();        echo $this->data;        $content=ob_get_contents();        ob_flush();        ob_clean();        file_put_contents($this->cacheFilePath, $content);    }        public function readCache(){        $cacheFile=$this->cacheFilePath;        if(file_exists($cacheFile)){            include $cacheFile;        }else{            return false;        }        return true;    }        public function cacheTime(){        $cacheFile=$this->cacheFilePath;        if(!file_exists($cacheFile)){            return true;        }elseif(fileatime($cacheFile)+$this->expiresTime<=time()){           return true;        }        return false;    }  }/////$cache=new fileCache(2, "cache/");if($cache->cacheTime()){    $cache->setData("hello world !");    $cache->buildCache();}else{    $cache->readCache();}
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