wp_ajax_menu_locations_save

function wp_ajax_menu_locations_save() {
	if ( ! current_user_can( 'edit_theme_options' ) ) {
		wp_die( -1 );
	}

	check_ajax_referer( 'add-menu_item', 'menu-settings-column-nonce' );

	if ( ! isset( $_POST['menu-locations'] ) ) {
		wp_die( 0 );
	}

	set_theme_mod( 'nav_menu_locations', array_map( 'absint', $_POST['menu-locations'] ) );
	wp_die( 1 );
}