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WordPress Plugin: Filename-based cache busting for scripts/styles.
* Plugin Name: Filename-based cache busting
* Version: 0.3
* Description: Filename-based cache busting for WordPress scripts/styles.
* Author: Dominik Schilling
* Author URI:
* Plugin URI:
* License: GPLv2 or later
* License URI:
* Extend your .htaccess file with these lines:
* <IfModule mod_rewrite.c>
* RewriteEngine On
* RewriteBase /
* RewriteCond %{REQUEST_FILENAME} !-f
* RewriteCond %{REQUEST_FILENAME} !-d
* RewriteRule ^(.+)\.(.+)\.(js|css)$ $1.$3 [L]
* </IfModule>
* Moves the `ver` query string of the source into
* the filename. Doesn't change admin scripts/styles and sources
* with more than the `ver` arg.
* @param string $src The original source.
* @return string
function ds_filename_based_cache_busting( $src ) {
// Don't touch admin scripts.
if ( is_admin() ) {
return $src;
$_src = $src;
if ( '//' === substr( $_src, 0, 2 ) ) {
$_src = 'http:' . $_src;
$_src = parse_url( $_src );
// Give up if malformed URL.
if ( false === $_src ) {
return $src;
// Check if it's a local URL.
$wp = parse_url( home_url() );
if ( isset( $_src['host'] ) && $_src['host'] !== $wp['host'] ) {
return $src;
return preg_replace(
add_filter( 'script_loader_src', 'ds_filename_based_cache_busting' );
add_filter( 'style_loader_src', 'ds_filename_based_cache_busting' );

Thanks for this! Working perfectly.

FStop commented Feb 5, 2013

I don't know enough to know exactly why, but I had better luck omitting the

RewriteEngine On
RewriteBase /

lines in the .htaccess portion. I did notice that these lines were already present WordPress's .htaccess items.

Otherwise perfect & just what I was looking for. Thanks!


Has anyone tested this with Wordpress 4.x?


just tested this on wp 4.1.1 and it doesn't work - urls still have ?ver=x.x at the end.

Anyone know how to make it work again?


Looks like the add_filter does not have sufficient parameters. According to the function we define it needs a $handle parameter because apply_filter defines it - however I tried adding this and it made no difference.


Has anybody managed to get this working with Nginx? Specifically Nginx 1.4.6.
The plugin itself is changing the filenames, but I can't get Nginx to load the files.


This plugin seems to do a similiar job - perhaps better?
Seems to work ok with vanilla wordpress installs, struggles with compatibility with other plugins and certain theme elements.


Tim Woolfson

Protohominid commented Oct 30, 2016 edited

Does anyone know why this would be working perfectly for me locally (Apache/PHP 7) but on the remote test server (Nginx/PHP 5.6) it's failing with errors regarding https. Both my local server and remote test site have SSL enabled, but on the remote server, I'm getting 'blocked - mixed content' errors. It seems to be trying to load everything over http, even though I changed the plugin's code (line 42) to "https:".

Is there something to do with PHP 7 vs PHP 5.6 here, or apache vs nginx, or is it something else?


Seems to be an issue with Nginx, as cdshepherd noted. Bummer, I thought this was going to solve my cache problems.

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