WP Rocket ASYNC CSS

This plugin will combine all inline and external CSS in the order found on the page and save it to WP-Rocket’s cache folder as a new file. Files with media attributes are wrapped in @media selectors during processing. Async is powered by https://github.com/filamentgroup/loadCSS.

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Filters rocket_async_css_process_style and rocket_async_css_process_file can be used to selectively exclude any inline CSS or external CSS from minify and async loading.

Examples are:

function exclude_css($skip, $css){
    if ( false !== strpos( $css, 'something' ) ) {
            return false;
        }

    return $skip;
}
add_filter('rocket_async_css_process_style','exclude_css', 10, 2);

and

function exclude_file($skip, $url){
    if ( 'some url' == $url ) {
            return false;
    }

    return $skip;
}
add_filter('rocket_async_css_process_style','exclude_file', 10, 2);