Snow Monkey で、フック (wp_nav_menu_args) を使ってナビゲーションを差し替える

add_action(
	'after_setup_theme',
	function() {
		register_nav_menus(
			[
				'global-nav-2'        => esc_html__( 'Global Navigation 2 (For PC)', 'snow-monkey' ),
				'drawer-nav-2'        => esc_html__( 'Drawer Navigation 2 (For Mobile)', 'snow-monkey' ),
				'global-nav-3'        => esc_html__( 'Global Navigation 3 (For PC)', 'snow-monkey' ),
				'drawer-nav-3'        => esc_html__( 'Drawer Navigation 3 (For Mobile)', 'snow-monkey' ),
			]
		);
	}
);

// メニューの差し替え

add_filter(
	'wp_nav_menu_args',
	function ( $args ) {
		if ( 'global-nav' === $args['theme_location'] ) { // どのナビゲーションを差し替えるか
			if ( is_page( $page-3 ) ) { //（mixed）ナビゲーションを差し替える固定ページの ID、タイトル、スラッグ、またはそれらの配列
				$theme_location = 'global-nav-3';
			} elseif ( is_page( $page-2 ) ) {
				$theme_location = 'global-nav-2';
			} else {
				$theme_location = 'global-nav';
			}
			$args['theme_location'] = $theme_location;
		} elseif ( 'drawer-nav' === $args['theme_location'] ) {
			if ( is_page( $page-3 ) ) {
				$theme_location = 'drawer-nav-3';
			} elseif ( is_page( $page-2 ) ) {
				$theme_location = 'drawer-nav-2';
			} else {
				$theme_location = 'drawer-nav';
			}
			$args['theme_location'] = $theme_location;
		}
		return $args;
	}
);