WordPress at a glance
function is not described

update_site_cache() WP 4.6.0

Updates sites in cache.

No Hooks.

Return

Nothing (null).

Usage

update_site_cache( $sites );
$sites(array) (required)
Array of site objects.

Code of update site cache: wp-includes/ms-blogs.php VER 5.0.3

<?php
function update_site_cache( $sites ) {
	if ( ! $sites ) {
		return;
	}

	foreach ( $sites as $site ) {
		wp_cache_add( $site->blog_id, $site, 'sites' );
		wp_cache_add( $site->blog_id . 'short', $site, 'blog-details' );
	}
}