Pressbooks\Pressbooks::registerThemeDirectories PHP Метод

    function registerThemeDirectories()
    {
        // No trailing slash, otherwise we get a double slash bug
        // @see \Pressbooks\Metadata::fixDoubleSlashBug
        register_theme_directory(PB_PLUGIN_DIR . 'themes-root');
        register_theme_directory(PB_PLUGIN_DIR . 'themes-book');
        do_action('pressbooks_register_theme_directory');
        // Check for local themes-root directory
        if (realpath(WP_CONTENT_DIR . '/themes-root')) {
            register_theme_directory(WP_CONTENT_DIR . '/themes-root');
        }
        if (is_admin()) {
            if (Book::isBook()) {
                add_filter('allowed_themes', array($this, 'allowedBookThemes'));
            } elseif (!is_network_admin()) {
                add_filter('allowed_themes', array($this, 'allowedRootThemes'));
            }
        }
    }