GNU IS NOT UNIX

贴一个Cache类个人用得不错

上一篇 / 下一篇 2007-12-27 14:48:49 / 个人分类：杂

<?php

class cache
{

    var $cacheDirectory;

    var $cacheDuration;

    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)&&($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)
     {
         $this->_setCacheFilename($contents);
        return file_exists($this->cacheFilename);
     }

     function readCache()
     {
         $contents = '';
         $fp = @fopen($this->cacheFilename,'r');
        if ($fp)
        {
            while(!feof($fp)) $contents .= fread($fp,4096);
            fclose($fp);
        }
        return $contents;
     }

    function updateCache($cacheDuration=86400,$cacheFolder='./cache')
    {
        $this->cacheDuration = $cacheDuration;
        $this->cacheDirectory = $cacheFolder;
        $this->_makeCacheFolder();
    }

     function saveInCache($contents,$filename='')
     {
            if (trim($filename)=='') $filename = $contents;
            if ($this->inCache($filename)&&((filectime($this->cacheFilename)-time())>$this->cacheDuration))
            {
                @unlink($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);
             }
         }
     }

}
?>

<?php
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;
?>

贴一个Cache类个人用得不错

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