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一个不错php文件缓存类文件

WBOY
Release: 2016-06-13 11:27:36
Original
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本人给大家推一个不错php文件缓存类文件,从各方面来看本缓存类很合理并且适用于大型网站使用哦,有需要的朋友可参考参考。

 代码如下 复制代码

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 = $this->CacheDir.'/'.md5($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).'/'.($this->CacheTime*60).'');
  $this->CacheFound = $GetTime 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;
   $CacheFile = str_replace('//','/',$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("/", $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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