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Editorial Team
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Asked: 2026-05-24T17:50:58+00:00

In my project CSS files can be pre-processed and then optionally minified (depending upon

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In my project CSS files can be pre-processed and then optionally minified (depending upon configuration).

Q1. Should multiple cache variations be generated for different combinations of CSS files?

res.php?stylesheets=test.css,test2.css,test3.css
res.php?stylesheets=test.css,test3.css

Q2. In the past I have noticed that such cache files were given some sort of GUID. How can I generate such an ID based upon the request?

res.php?stylesheets=test.css,test2.css,test3.css
  => cache/css/a3cadfeA33afADSFwwrzgnzzddsveraeAE
res.php?stylesheets=test.css,test3.css
  => cache/css/ergope4t5oiyk0sfb9x0fHkg04mm04tjzG

Please excuse the naivety of the above IDs!

Somehow I need to be able to regenerate the same ID from the stylesheets specified.

My question is only about caching of multiple variations and ID generation.

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1 Answer

  1. Editorial Team

    1. Yes, some pages will need different combinations of style sheets. Each combination must be cached individually. Unfortunately, the browser won’t know that there isn’t a difference between ?stylesheets=a.css,b.css and ?stylesheets=b.css,a.css so both will need to be cached.

    2. That’s used to make sure the browser doesn’t accidentally cache the dynamically generated stylesheet. It’s unnecessary if you are using a decent minifier. Usually, the GUID is found by hashing the last-modified times of each file in the list. Like I said, most minifiers will automatically check for new versions of files and discard the old cached version.

    I would suggest PHP Minify. Installation is as easy as copying the folder into your doc root. It also supports JavaScript compression with the Google Closure Compiler.

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