<?php  /* menu */
                    wp_nav_menu( array(
                                'menu'              => 'menu-1',
                                'theme_location'    => 'menu-1',
                                'depth'             => 5,
                                'container'         => 'div',
                                'container_class'   => 'collapse navbar-collapse navbar-ex1-collapse ',
                                'menu_class'        => 'nav navbar-nav  ',
                                'fallback_cb'       => 'wp_bootstrap_navwalker::fallback',
                                'walker'            => new wp_bootstrap_navwalker())
                    );
                 ?>