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HomeBackend DevelopmentPHP TutorialPHP透过文件存储来实现缓存

PHP通过文件存储来实现缓存

PHP通过文件存储来实现缓存

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。 

[php] view plaincopy
  1.   
  2. //页面业务逻辑处理,获得结果  
  3. $objPage = new Page_IndexModel($arrParams);  
  4.   
  5. //一系列的业务逻辑放在了objPage中,调用process方法获得结果集  
  6. $arrResult = $objPage->process();  
  7.   
  8. //获得结果后smarty赋值  
  9. $smarty->assign($arrResult);  
  10.   
  11. //输出模板  
  12. $smarty->display();  
  13.   
  14. ?>  


现在我们用文件缓存来略过Page业务处理这一步 
[php] view plaincopy
  1.   
  2. $cachFile = './index.php';  
  3. //缓存文件存在且时间不超过一小时,则直接使用缓存的结果集,不在进行任何的MySQL查询了  
  4. if(file_exists($cacheFile) && time()-filemtime($cachFile
  5.    //使用缓存中的结果  
  6.    $arrResult = include($cachFile);  
  7. else {  
  8.    $objPage = new Page_IndexModel($arrParams);  
  9.    $arrResult = $objPage->process();  
  10.    $strContent = ".var_export($arrResult, true)."\n;";  
  11.      
  12.    //将结果集缓存  
  13.    file_put_contents($cachFile$strContent);  
  14. }  
  15.   
  16. //获得结果后smarty赋值  
  17. $smarty->assign($arrResult);  
  18.   
  19. //输出模板  
  20. $smarty->display();  


参考来源: 
PHP通过文件存储来实现缓存
http://www.lai18.com/content/407149.html

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