散列css和js文件来破解缓存。它慢吗？ [英] hash css and js files to break cache. Is it slow?

问题描述

我有一些生成页面模板的脚本。此外，此脚本在HTML中呈现< script> 和< link rel ='stylesheet> 标记。

我想用？v = xxxxx参数添加缓存中断功能。

我这样做：

  foreach（$ scripts as& $ script）{
 
 //获取脚本文件名
 $ script ={$ this-> _js_folder} / {$ script}; 
 
 //得到它的真实路径
 $ realfile = realpath（substr（$ script，1））; 
 
 //散列文件
 $ hash = md5_file（$ realfile）; 
 
 //添加缓存破解号
 $ script。='？v ='。$ hash; 
 $ b $} //：foreach 
  

不是很慢，每次用户刷新页面时都会打开几十个文件？解析方案

这对您的用户每次都会破坏缓存很残酷。你多久换一次这些文件？

无论如何，我会建议使用时间戳 - 远比md5快。

I have some script that generates templates of a page. Also, this scripts renders <script> and <link rel='stylesheet'> tags in the HTML.

I'd like to add cache-breaking feature with "?v=xxxxx" parameter.

I do it in such a way:

foreach ($scripts as &$script) {

    // get script file name
    $script = "{$this->_js_folder}/{$script}";

    // get it's realpath
    $realfile = realpath(substr($script,1));

    // hashing the file
    $hash = md5_file($realfile);

    // adding cache-breaking number
    $script .= '?v='.$hash;

} //: foreach

Isn't it slow, to hash about a dozen files every time user refreshes the page?

解决方案

That's cruel to your users to break the cache every time. How often do you change those files?

At any rate, I would suggest using a timestamp-- far faster than md5.

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