wp_nav_menu_taxonomy_meta_boxes()

Source

function wp_nav_menu_taxonomy_meta_boxes() {
	$taxonomies = get_taxonomies( array( 'show_in_nav_menus' => true ), 'object' );

	if ( ! $taxonomies ) {
		return;
	}

	foreach ( $taxonomies as $tax ) {
		/** This filter is documented in wp-admin/includes/nav-menu.php */
		$tax = apply_filters( 'nav_menu_meta_box_object', $tax );

		if ( $tax ) {
			$id = $tax->name;
			add_meta_box(
				"add-{$id}",
				$tax->labels->name,
				'wp_nav_menu_item_taxonomy_meta_box',
				'nav-menus',
				'side',
				'default',
				$tax
			);
		}
	}
}

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