wp_ajax_meta_box_order()

function wp_ajax_meta_box_order() {
	check_ajax_referer( 'meta-box-order' );
	$order = isset( $_POST['order'] ) ? (array) $_POST['order'] : false;
	$page_columns = isset( $_POST['page_columns'] ) ? $_POST['page_columns'] : 'auto';

	if ( $page_columns != 'auto' )
		$page_columns = (int) $page_columns;

	$page = isset( $_POST['page'] ) ? $_POST['page'] : '';

	if ( $page != sanitize_key( $page ) )
		wp_die( 0 );

	if ( ! $user = wp_get_current_user() )
		wp_die( -1 );

	if ( $order )
		update_user_option($user->ID, "meta-box-order_$page", $order, true);

	if ( $page_columns )
		update_user_option($user->ID, "screen_layout_$page", $page_columns, true);

	wp_die( 1 );
}