Returns an array containing the number of blogs and users registered on this WPMU site, including blogs which are currently marked not public. Useful for displaying general site statistics.
As this function returns values, you should assign the return value to a variable and access the desired array elements.
<?php $site_stats = get_sitestats(); ?>
(Devportals) You can post stats in your sidebar by pasting the following snippet into your theme's sidebar.php:
$stats = get_sitestats();
echo 'There are currently '.$stats[ 'blogs' ].' blogs running on this server and '.$stats[ 'users' ].' users.';