I have run across a WordPress theme that the developers intentionally set to not be usable on a multisite network. The theme was installed on my single site and then when I configured it to be a multisite network and did the initial log out and log back in I got a message that the theme could not be used on multisite networks but only standard single sites.

I'm curious how I could achieve this on a theme I'm developing, to make it unable to be used on a multisite network?


This is right from the codex page, http://codex.wordpress.org/Function_Reference/is_multisite

<?php if ( is_multisite() ) { echo 'Multisite is enabled'; } ?> 
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