本文共 3085 字,大约阅读时间需要 10 分钟。
- <?php
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- class cache {
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- var $cacheRoot = "./cache/";
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- var $cacheLimitTime = 0;
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- var $cacheFileName = "";
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- var $cacheFileExt = "php";
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- function cache( $cacheLimitTime ) {
- if( intval( $cacheLimitTime ) )
- $this->cacheLimitTime = $cacheLimitTime;
- $this->cacheFileName = $this->getCacheFileName();
- ob_start();
- }
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- 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;
- }
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- function caching( $staticFileName = "" ){
- if( $this->cacheFileName ) {
- $cacheContent = ob_get_contents();
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- ob_end_flush();
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- if( $staticFileName ) {
- $this->saveFile( $staticFileName, $cacheContent );
- }
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- if( $this->cacheLimitTime )
- $this->saveFile( $this->cacheFileName, $cacheContent );
- }
- }
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- 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;
- }
- }
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- function getCacheFileName() {
- return $this->cacheRoot . strtoupper(md5($_SERVER["REQUEST_URI"])).".".$this->cacheFileExt;
- }
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- function getFileCreateTime( $fileName ) {
- if( ! trim($fileName) ) return 0;
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- if( file_exists( $fileName ) ) {
- return intval(filemtime( $fileName ));
- }else return 0;
- }
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- function saveFile($fileName, $text) {
- if( ! $fileName || ! $text ) return false;
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- 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;
- }
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- function makeDir( $dir, $mode = "0777" ) {
- if( ! $dir ) return 0;
- $dir = str_replace( "\\", "/", $dir );
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- $mdir = "";
- foreach( explode( "/", $dir ) as $val ) {
- $mdir .= $val."/";
- if( $val == ".." || $val == "." || trim( $val ) == "" ) continue;
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- if( ! file_exists( $mdir ) ) {
- if(!@mkdir( $mdir, $mode )){
- return false;
- }
- }
- }
- return true;
- }
- }
- ?>
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