WordPress at a glance
function is not described

mu_options() WP 1.0

Deprecated in 3.0.0. It is no longer supported and can be removed in future releases. It is recommended to replace this function with the same one.

WPMU options.

No Hooks.

Return

Nothing (null).

Usage

mu_options( $options );

Code of mu options: wp-admin/includes/ms-deprecated.php VER 5.0.3

<?php
function mu_options( $options ) {
	_deprecated_function(__FUNCTION__, '3.0.0' );
	return $options;
}