贴一个Cache类个人用得不错

PHP代码:




<?php


class cache

{


var $cacheDirectory;


var $cacheDuration=3600;


var $cacheFilename;


function cache($cacheDuration=3600,$cacheDirectory='./cache')

{

$this->cacheDuration = 0;

$this->cacheFilename = '';

$this->cacheDirectory = '.';

$this->updateCache($cacheDuration,$cacheDirectory);

}


function _makeCacheFolder()

{

if (!is_dir($this->cacheDirectory))

{

$temp = explode('/',$this->cacheDirectory);

$cur_dir = '';

for($i=0;$i<count($temp);$i++)

{

$cur_dir .= $temp[$i].'/';

if (!is_dir($cur_dir))

{

if (@mkdir($cur_dir,777)&&($cur_dir!=getcwd()))

{

$this->_writeFile($cur_dir.'.htaccess','Deny from all');

$this->_writeFile($cur_dir.'index.html','');

}

}

}

}


}


function getCacheFilename()

{

return $this->cacheFilename;

}


 function _setCacheFilename($contents)

 {

$this->cacheFilename = $this->cacheDirectory.'/'.md5($contents).'.txt';

 }


 function inCache($contents,$sty='')

 {

$this->_setCacheFilename($contents);

if($sty==1)

 {

return file_exists($this->cacheFilename);

 }

 else

 {

if(file_exists($this->cacheFilename))

 {

$tim=filemtime($this->cacheFilename);

if((time()-$tim)>$this->cacheDuration)

 {

return false;

 }

 else

 {

return true;

 }

 }

 else

 {

 return false;

 }

 }

 }


 function readCache()

 {

$contents = '';

$fp = @fopen($this->cacheFilename,'r');

if ($fp)

{

while(!feof($fp)) $contents .= fread($fp,4096);

fclose($fp);

}

return $contents;

 }


function updateCache($cacheDuration=3600,$cacheFolder='./cache')

{

$this->cacheDuration = $cacheDuration;

$this->cacheDirectory = $cacheFolder;

$this->_makeCacheFolder();

}


 function saveInCache($contents,$filename='')

 {

$tim=filemtime($this->cacheFilename);

if (trim($filename)=='') $filename = $contents;

if ($this->inCache($filename,1)&&(time()-$tim)>$this->cacheDuration)

{

@unlink($this->cacheFilename);

}

$this->_writeFile($this->cacheFilename,$contents);

 }


 function _writeFile($filename,$contents)

 {

 if (!file_exists($filename))

 {

$fp = @fopen($filename,'w');

 if ($fp)

 {

fputs($fp,$contents);

fclose($fp);

 }

 }

else

 {

unlink($filename);

$fp = @fopen($filename,'w');

 if ($fp)

 {

fputs($fp,$contents);

fclose($fp);

 }

 }

 }


}

?>

PHP代码:


使用方法：

include_once(_CONPATH_."Class/Class_Cache.php");

$cache=new cache();

if($cache->incache($_SERVER['QUERY_STRING']))

{

$output=$cache->readcache();

}

else

{

ob_start();

//这里是输出的内容

$output = ob_get_clean(); 

$cache->saveInCache($output,$_SERVER['QUERY_STRING']); 

}

unset($cache);

print($output);

exit;