再来一个缓存类

缓存类/** 缓存类 cache* 作 者：多菜鸟* 创建时间：2006-05-05* 实 例：include( "cache.php" );$cache = new cache(30);$cache->cacheCheck();echo date("Y-m-d H:i:s");$cache->caching();*/class cache {//缓存目录var $cacheRoot = "./cache/";//缓存更新时间秒数，0为不缓存var $cacheLimitTime = 0;//缓存文件名var $cacheFileName = "";//缓存扩展名var $cacheFileExt = "php";/** 构造函数* int $cacheLimitTime 缓存更新时间*/function cache( $cacheLimitTime ) {if( intval( $cacheLimitTime ) )$this->cacheLimitTime = $cacheLimitTime;$this->cacheFileName = $this->getCacheFileName();ob_start();}/** 检查缓存文件是否在设置更新时间之内* 返回：如果在更新时间之内则返回文件内容，反之则返回失败*/function cacheCheck(){if( file_exists( $this->cacheFileName ) ) {$cTime = $this->getFileCreateTime( $this->cacheFileName );if( $cTime + $this->cacheLimitTime > time() ) {echo file_get_contents( $this->cacheFileName );ob_end_flush();exit;}}return false;}/** 缓存文件或者输出静态* string $staticFileName 静态文件名（含相对路径）*/function caching( $staticFileName = "" ){if( $this->cacheFileName ) {$cacheContent = ob_get_contents();//echo $cacheContent;ob_end_flush();if( $staticFileName ) {$this->saveFile( $staticFileName, $cacheContent );}if( $this->cacheLimitTime )$this->saveFile( $this->cacheFileName, $cacheContent );}}/** 清除缓存文件* string $fileName 指定文件名(含函数)或者all（全部）* 返回：清除成功返回true，反之返回false*/function clearCache( $fileName = "all" ) {if( $fileName != "all" ) {$fileName = $this->cacheRoot . strtoupper(md5($fileName)).".".$this->cacheFileExt;if( file_exists( $fileName ) ) {return @unlink( $fileName );}else return false;}if ( is_dir( $this->cacheRoot ) ) {if ( $dir = @opendir( $this->cacheRoot ) ) {while ( $file = @readdir( $dir ) ) {$check = is_dir( $file );if ( !$check )@unlink( $this->cacheRoot . $file );}@closedir( $dir );return true;}else{return false;}}else{return false;}}/** 根据当前动态文件生成缓存文件名*/function getCacheFileName() {return $this->cacheRoot . strtoupper(md5($_SERVER["REQUEST_URI"])).".".$this->cacheFileExt;}/** 缓存文件建立时间* string $fileName 缓存文件名（含相对路径）* 返回：文件生成时间秒数，文件不存在返回0*/function getFileCreateTime( $fileName ) {if( ! trim($fileName) ) return 0;if( file_exists( $fileName ) ) {return intval(filemtime( $fileName ));}else return 0;}/** 保存文件* string $fileName 文件名（含相对路径）* string $text 文件内容* 返回：成功返回ture，失败返回false*/function saveFile($fileName, $text) {if( ! $fileName || ! $text ) return false;if( $this->makeDir( dirname( $fileName ) ) ) {if( $fp = fopen( $fileName, "w" ) ) {if( @fwrite( $fp, $text ) ) {fclose($fp);return true;}else {fclose($fp);return false;}}}return false;}/** 连续建目录* string $dir 目录字符串* int $mode 权限数字* 返回：顺利创建或者全部已建返回true，其它方式返回false*/function makeDir( $dir, $mode = "0777" ) {if( ! $dir ) return 0;$dir = str_replace( "\", "/", $dir );$mdir = "";foreach( explode( "/", $dir ) as $val ) {$mdir .= $val."/";if( $val == ".." || $val == "." || trim( $val ) == "" ) continue;if( ! file_exists( $mdir ) ) {if(!@mkdir( $mdir, $mode )){return false;}}}return true;}}?>复制代码