WP_REST_Menus_Controller::handle_locations( int $menu_id, WP_REST_Request $request ): true|WP_Error

Source

protected function handle_locations( $menu_id, $request ) {
	if ( ! isset( $request['locations'] ) ) {
		return true;
	}

	$menu_locations = get_registered_nav_menus();
	$menu_locations = array_keys( $menu_locations );
	$new_locations  = array();
	foreach ( $request['locations'] as $location ) {
		if ( ! in_array( $location, $menu_locations, true ) ) {
			return new WP_Error(
				'rest_invalid_menu_location',
				__( 'Invalid menu location.' ),
				array(
					'status'   => 400,
					'location' => $location,
				)
			);
		}
		$new_locations[ $location ] = $menu_id;
	}
	$assigned_menu = get_nav_menu_locations();
	foreach ( $assigned_menu as $location => $term_id ) {
		if ( $term_id === $menu_id ) {
			unset( $assigned_menu[ $location ] );
		}
	}
	$new_assignments = array_merge( $assigned_menu, $new_locations );
	set_theme_mod( 'nav_menu_locations', $new_assignments );

	return true;
}

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