navbar

<?php
            wp_nav_menu( array(
                    'menu'              => 'primary',
                    'depth'             => 2,
                    'container'         => 'div',
                    'container_class'   => 'collapse navbar-collapse',
                    'menu_class'        => 'nav navbar-nav',
                    'fallback_cb'       => 'wp_bootstrap_navwalker::fallback',
                    'walker'            => new wp_bootstrap_navwalker())
            );
            ?>