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Very easy to use php caching class

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Very easy to use php caching class

<?
/*
用户需要事先定义的常量：
_CachePath_        模板缓存路径
_CacheEnable_        自动缓存机制是否开启，未定义或为空，表示关闭自动缓存机制
_ReCacheTime_        自动重新缓存间隔时间，单位为秒，未定义或为空，表示关闭自动重新缓存
*/
class cache
{
    var $cachefile;
    var $cachefilevar;
    function cache()
    {
        //生成当前页的Cache组文件名 $this->cachefilevar 及文件名 $this->cachefile
        //动态页的参数不同对应的Cache文件也不同，但是每一个动态页的所有Cache文件都有相同的文件名，只是扩展名不同
        $s=array(".","/");$r=array("_","");
        $this->cachefilevar=str_replace($s,$r,$_SERVER["SCRIPT_NAME"])."_".$_GET[_ActionVar_];
        $this->cachefile=$this->cachefilevar.".".md5($_SERVER["REQUEST_URI"]);
    }

The cache is the buffer for data exchange. When a piece of hardware wants to read data, it will first search the required data from the cache. If it is found, it will be executed directly. If it is not found, it will be searched from the memory. Since cache runs much faster than memory, the purpose of the cache is to help the hardware run faster.

Because cache often uses RAM, the files will still be sent to storage such as hard disks for permanent storage after use. The largest cache in a computer is the memory stick. The fastest ones are the L1 and L2 caches built into the CPU. The video memory of the graphics card is a cache for the graphics card's computing chip. There is also a 16M or 32M cache on the hard disk.

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