WordPress at a glance
function is not described

wp_cache_set_sites_last_changed() WP 5.1.0

Sets the last changed time for the 'sites' cache group.

No Hooks.

Return

Null. Nothing.

Usage

wp_cache_set_sites_last_changed();

Changelog

Since 5.1.0 Introduced.

Code of wp_cache_set_sites_last_changed() WP 5.5.1

<?php
function wp_cache_set_sites_last_changed() {
	wp_cache_set( 'last_changed', microtime(), 'sites' );
}