/ in URL query makes CSS @import and file paths fail

Jun 9, 2010 archive

I am currently implementing css file bundling with virtual paths in php and am facing a problem, where slashes in the url query make file imports fail.

The css file bundling writes a virtual path to a php file, as such:

~/bundle/bundle.css&cssFolders=... => ~/bundle/bundle.php&type=css&cssFolders=...

Since I provide paths to my css folders, a bundle url may look like this:


The bundle file then builds the resulting css content by importing all files that it finds, for instance:

@import url("../css/x.css");
@import url("../shared/css/y.css");

This solution only works in some cases and fails for others. I was confused before I found the solution.

The / chars in the URL query makes the @import statement fail, since it seems to count all / in the URL, not just all the / in the path excluding the query.

This is understandable, since css files are not meant to handle query variables, but in this case, we have a virtual css file that handles query variables, which is why we need to solve this problem.

The solution, in this case, is to count the number of / in the query variable cssFolders and add an extra ../ for each additional / in the import statements.