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;
