Register script version not showing

I want to implement cache busting on a specific script, but the version is not added to the url as query vars.

Here is the code I’m using :

wp_register_script( 'custom', get_stylesheet_directory_uri() . '/js/custom.min.js', array('jquery','modernizr'), filemtime( get_stylesheet_directory().'/js/custom.min.js' ), true );

I’m using the filemtime function to get the timestamp of the last modification as my version.

But in the source I get :

<script type="text/javascript" src="https://example.com/app/themes/MyTheme/js/custom.min.js"></script>

Where I would want something like http://example.com/app/themes/MyTheme/js/custom.min.js?v=1472031892

I can verify this is working for me and it looks much like the code you’ve provided.

Perhaps there is somewhere else you are defining your script. Can you give it a new handle name to check ('custom-xyz')?

Also, can you test the output of filemtime to see what it’s outputting? I’ve added a “v” in front of it in case it returns false.

$ver = "v" . filemtime( get_stylesheet_directory().'/js/custom.min.js' );

wp_register_script( 'custom',

    get_stylesheet_directory_uri() . '/js/custom.min.js',

    array( 'jquery','modernizr' ),

    $ver,

    true);

wp_enqueue_script( 'custom' );

If, for the odd reason you can’t get it to work correctly when you register, you could potentially filter the tag on output using script_loader_tag and some regex or str_replace.

wp_register_script( 'custom',

    get_stylesheet_directory_uri() . '/js/custom.min.js',

    array( 'jquery','modernizr' ),

    '%%CACHE_BUSTER%%',

    true);

wp_enqueue_script( 'custom' );

function script_tag_cache_buster( $tag, $handle, $src ) {

    if ( 'custom' === $handle ) {
        return str_replace( '%%CACHE_BUSTER%%', "v" . filemtime( get_stylesheet_directory().'/js/custom.min.js'), $tag );
    }

    return $tag;
}

add_filter( 'script_loader_tag', 'script_tag_cache_buster', 10, 3 );