'primary',
'container' => false,
'depth' => 4,
'menu_class' => 'menu-items',
'menu_id' => 'main-menu',
'echo' => true,
'fallback_cb' => __NAMESPACE__ . '\Nav_Walker::fallback',
'items_wrap' => '',
'has_dropdown' => true,
'walker' => new Nav_Walker(),
) ); ?>