function force_https_stylesheet_dir_uri($url) {
    return str_replace('http://', 'https://', $url);
}
add_filter('stylesheet_directory_uri', 'force_https_stylesheet_dir_uri', 999);

function force_https_template_dir_uri($url) {
    return str_replace('http://', 'https://', $url);
}
add_filter('template_directory_uri', 'force_https_template_dir_uri', 9999);

function force_https_stylesheet_dir_uri($url) {
    return str_replace('http://', 'https://', $url);
}
add_filter('stylesheet_directory_uri', 'force_https_stylesheet_dir_uri', 9999);

function debug_template_dir_uri($url) {
    return 'DEBUG::' . $url;
}
add_filter('template_directory_uri', 'debug_template_dir_uri', 9999);
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