I'm attempting to modify a WordPress theme so that it appends a version number to a particular stylesheet. This is all done on a local development machine, tested on a staging server, too, for good measure. Following the instructions here: https://www.mojowill.com/developer/get-your-wordpress-css-changes-noticed-immediately/, I added filemtime( get_template_directory() . '/css/main.css' ) into the arguments passed through wp_register_style


wp_register_style('style', get_template_directory_uri() . '/css/style.css', array(), '', 'all');


wp_register_style('style', get_template_directory_uri() . '/css/style.css', array(), 'filemtime( get_template_directory_uri() . '/css/style.css'', 'all');

No soap. Viewing the source of the rendered page, I see the stylesheet link has no version appended to it.

I tried pulling the filemtime function out of the $ver slot, and replacing it with a static value like 1.0, and that didn't work, either. Finally, I skipped the $ver argument, and changed the path to a versioned file, like so:

wp_register_style('style', get_template_directory_uri() . '/css/style.css?ver=1.0', array(), '', 'all');

Still nothing. Why would WordPress refuse to acknowledge these updates? No server-side caching or plugins that I could imagine would influence this process. Is there something very simple I'm missing?

Thanks much


edit: Here's the entire relevant code block.

function minikit_register_js_and_css() {
    if (!is_admin()) {  
        wp_register_style('style', get_template_directory_uri() . '/css/style.css?ver=1.1', array(), '', 'all');

3 Answers 3


At long last, I have identified the issue. The theme I was working in used the Minikit theme starter, which has a function that strips version numbers.

function minikit_remove_wp_ver_css_js($src) { if (strpos($src, 'ver=')) $src = remove_query_arg('ver', $src); return $src; }

Naturally, the version numbers returned once I stopped calling this function.


Make sure to wp_enqueue_style ('unique-style-name' ).

add_action( 'wp_enqueue_scripts', 'register_plugin_styles' );

function register_plugin_styles() {
    wp_register_style( 'unique-style-name', plugins_url( 'my-plugin/css/plugin.css' ) );
    wp_enqueue_style( 'unique-style-name' );
  • Thanks, @jgraup. Good thought, but I'm afraid I'm certain I am using wp_enqueue_style(). Editing original question.
    – jamesfacts
    Dec 10, 2015 at 20:25
  • It looks like you're hardcoding the version and ignoring the version argument when you register. function wp_register_style( $handle, $src, $deps = array(), $ver = false, $media = 'all' ) what happens when you remove it from the url and pass the number as an argument?
    – jgraup
    Dec 10, 2015 at 20:45
  • wp_register_style('style', get_template_directory_uri() . '/css/style.css', array(), '1.1', 'all');
    – jgraup
    Dec 10, 2015 at 20:46
  • No change. I expected the $ver value to be tacked on, so I assumed that passing '' would mean nothing would be appended to the link URL. Taking the hardcoded version out and using the $ver value still doesn't modify the link when the site is rendered: <link rel='stylesheet' id='style-css' href='http://localhost:8888/wp-content/themes/xxxx/css/style.css' type='text/css' media='all' />
    – jamesfacts
    Dec 10, 2015 at 20:59
  • what happens when you wp_deregister_script ('style'); wp_register_style('style', get_template_directory_uri() . '/css/xyz.css?ver=youbetterworkorelse');wp_enqueue_style( 'style' );?
    – jgraup
    Dec 10, 2015 at 21:10

Some possibilities:

  • Try a different identifier other than 'style', make it unique to your plugin, something like 'myplugin_styles'
  • Is wp_head() called on you header.php file? Maybe the stylesheet code is hardcoded on the template.
  • Are you running any caching plugins? If so deactivate them.
  • This one is trickier, but are you sure this is the only wp_register_style declaration on your plugin? Maybe is being set again later on the same file or on another file.

Those are the first ideas that come to mind. I hope it helps

  • Thanks, @Felix-Chi. Good suggestions.... no luck so far. FWIW, I'm not working with a plugin, just attempting to force WP to increment the version of the theme's main stylesheet.
    – jamesfacts
    Dec 10, 2015 at 21:05
  • Oh ok, same principle applies though, some themes add wp_register_style declarations on the theme files like index.php and page.php instead of functions.php.
    – Felix
    Dec 10, 2015 at 21:14

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