- <?php
- /*
- * 缓存类 cache
- * 作 者:多菜鸟
- * 联系邮箱:kingerq AT msn DOT com
- * 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->clearCache('mv_moves.php');
- $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;
- }
- }
- ?>