WordPress at a glance
function is not described

is_archived() WP 3.0.0

Check if a particular blog is archived.

No Hooks.

Return

String. Whether the blog is archived or not

Usage

is_archived( $id );
$id(int) (required)
The blog id

Code of is archived: wp-includes/ms-blogs.php VER 5.0.3

<?php
function is_archived( $id ) {
	return get_blog_status($id, 'archived');
}