undismiss_core_update() WordPress Function

function undismiss_core_update( $version, $locale ) {
	$dismissed = get_site_option( 'dismissed_update_core' );
	$key       = $version . '|' . $locale;

	if ( ! isset( $dismissed[ $key ] ) ) {
		return false;
	}

	unset( $dismissed[ $key ] );
	return update_site_option( 'dismissed_update_core', $dismissed );
}
Uses	Description
wp-includes/option.php:update_site_option()	Updates the value of an option that was already added for the current network.
wp-includes/option.php:get_site_option()	Retrieve an option value for the current network based on name of option.