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Home PHP Libraries Other libraries Very easy to use php caching class
Very easy to use php caching class 
<?
/*
用戶需要事先定義的常量：
_CachePath_        模板緩存路徑
_CacheEnable_        自動(dòng)緩存機(jī)制是否開(kāi)啟，未定義或?yàn)榭?，表示關(guān)閉自動(dòng)緩存機(jī)制
_ReCacheTime_        自動(dòng)重新緩存間隔時(shí)間，單位為秒，未定義或?yàn)榭?，表示關(guān)閉自動(dòng)重新緩存
*/
class cache
{
    var $cachefile;
    var $cachefilevar;
    function cache()
    {
        //生成當(dāng)前頁(yè)的Cache組文件名 $this->cachefilevar 及文件名 $this->cachefile
        //動(dòng)態(tài)頁(yè)的參數(shù)不同對(duì)應(yīng)的Cache文件也不同，但是每一個(gè)動(dòng)態(tài)頁(yè)的所有Cache文件都有相同的文件名，只是擴(kuò)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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