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PHP基于文件存储实现缓存的方法,

本文实例讲述了PHP基于文件存储实现缓存的方法。分享给大家供大家参考。具体如下:

在一些数据库数据记录较大,但是服务器有限的时候,可能一条MySQL查询就会好几百毫秒,一个简单的页面一般也有十几条查询,这个时候也个页面加载下来基本要好几秒了,如果并发量高的话服务器基本就瘫痪了,造成一个页面很久也加载不下来,这个时候我们可以使用文件缓存来缓解下MySQL的压力,下面给个使用例子。

<&#63;php
//页面业务逻辑处理,获得结果
$objPage = new Page_IndexModel($arrParams);
//一系列的业务逻辑放在了objPage中,调用process方法获得结果集
$arrResult = $objPage->process();
//获得结果后smarty赋值
$smarty->assign($arrResult);
//输出模板
$smarty->display();
&#63;>

现在我们用文件缓存来略过Page业务处理这一步

<&#63;php
$cachFile = './index.php';
//缓存文件存在且时间不超过一小时,则直接使用缓存的结果集,不在进行任何的MySQL查询了
if(file_exists($cacheFile) && time()-filemtime($cachFile) < 3600) {
  //使用缓存中的结果
  $arrResult = include($cachFile);
} else {
  $objPage = new Page_IndexModel($arrParams);
  $arrResult = $objPage->process();
  $strContent = "<&#63;php \n return ".var_export($arrResult, true)."\n;";
  //将结果集缓存
  file_put_contents($cachFile, $strContent);
}
//获得结果后smarty赋值
$smarty->assign($arrResult);
//输出模板
$smarty->display();

希望本文所述对大家的php程序设计有所帮助。

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