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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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