class Cache { /** 缓存目录 **/ var $CacheDir = './c'; /** 缓存的文件 **/ var $CacheFile = ''; /** 文件缓存时间(分钟) **/ var $CacheTime = 0; /** 文件是否已缓存 **/ var $CacheFound = False; /** 错误及调试信息 **/ var $DebugMsg = NULL; function Cache($CacheTime = 0) { $this->CacheTime = $CacheTime; } private function Run() { /** 缓存时间大于0,检测缓存文件的修改时间,在缓存时间内为缓存文件名,超过缓存时间为False, 小于等于0,返回false,并清理已缓存的文件 **/ Return $this->CacheTime ? $this->CheckCacheFile() : $this->CleanCacheFile(); } function GetCache($VistUrl,$CacheFileType = 'html') { $this->SetCacheFile($VistUrl,$CacheFileType); $fileName=$this->CheckCacheFile(); if($fileName) { $fp = fopen($fileName,"r"); $content_= fread($fp, filesize($fileName)); fclose($fp); return $content_; } else { return false; } } private function SetCacheFile($VistUrl,$CacheFileType = 'html') { if(empty($VistUrl)) { /** 默认为index.html **/ $this->CacheFile = 'index'; }else { /** 传递参数为$_POST时 **/ $this->CacheFile = is_array($VistUrl) ? implode('.',$VistUrl) : $VistUrl; } $this->CacheFile = $this->CacheDir.'//m.sbmmt.com/m/'.md5($this->CacheFile); $this->CacheFile.= '.'.$CacheFileType; } function SetCacheTime($t = 60) { $this->CacheTime = $t; } private function CheckCacheFile() { if(!$this->CacheTime || !file_exists($this->CacheFile)) {Return False;} /** 比较文件的建立/修改日期和当前日期的时间差 **/ $GetTime=(Time()-Filemtime($this->CacheFile))/(60*1); /** Filemtime函数有缓存,注意清理 **/ Clearstatcache(); $this->Debug('Time Limit '.($GetTime*60).'//m.sbmmt.com/m/'.($this->CacheTime*60).''); $this->CacheFound = $GetTime <= $this->CacheTime ? $this->CacheFile : False; Return $this->CacheFound; } function SaveToCacheFile($VistUrl,$Content,$CacheFileType = 'html') { $this->SetCacheFile($VistUrl,$CacheFileType); if(!$this->CacheTime) { Return False; } /** 检测缓存目录是否存在 **/ if(true === $this->CheckCacheDir()) { $CacheFile = $this->CacheFile; $CacheFile = str_replace('//','//m.sbmmt.com/m/',$CacheFile); $fp = @fopen($CacheFile,"wb"); if(!$fp) { $this->Debug('Open File '.$CacheFile.' Fail'); }else { if(@!fwrite($fp,$Content)){ $this->Debug('Write '.$CacheFile.' Fail'); }else { $this->Debug('Cached File'); }; @fclose($fp); } }else { /** 缓存目录不存在,或不能建立目录 **/ $this->Debug('Cache Folder '.$this->CacheDir.' Not Found'); } } private function CheckCacheDir() { if(file_exists($this->CacheDir)) { Return true; } /** 保存当前工作目录 **/ $Location = getcwd(); /** 把路径划分成单个目录 **/ $Dir = split("//m.sbmmt.com/m/", $this->CacheDir); /** 循环建立目录 **/ $CatchErr = True; for ($i=0; $i if (!file_exists($Dir[$i])){ /** 建立目录失败会返回False 返回建立最后一个目录的返回值 **/ $CatchErr = @mkdir($Dir[$i],0777); } @chdir($Dir[$i]); } /** 建立完成后要切换到原目录 **/ chdir($Location); if(!$CatchErr) { $this->Debug('Create Folder '.$this->CacheDir.' Fail'); } Return $CatchErr; } private function CleanCacheFile() { if(file_exists($this->CacheFile)) { @chmod($this->CacheFile,777); @unlink($this->CacheFile); } /** 置没有缓存文件 **/ $this->CacheFound = False; Return $this->CacheFound; } function Debug($msg='') { if(DEBUG) { $this->DebugMsg[] = '[Cache]'.$msg; } } function GetError() { Return empty($this->DebugMsg) ? '' : " n".implode(" n",$this->DebugMsg); } }/* end of class */ ?>
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