WordPress:WPMU Functions/get current site

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Returns the following items:

 id
 domain
 path
 site_name

Usage

To get the blog id, you would use the following code:

$current_site = get_current_site();
echo $current_site->id;

Or, to do the same, but in only one line:

echo get_current_site()->id;

The function as found in footer.php of most Wordpress themes:

<?php $current_site = get_current_site(); ?>

Need content to help solve the following PHP fatal error:

Fatal error: Call to undefined function get_current_site() in /blah/www.mysite.com/wp-content/themes/blah/footer.php on line 2