http://omeka.org/codex/Exhibit_builder_get_exhibits indicates that this function exists and is part of Exhibit Builder. I did a search of the Exhibit Builder code base and the Omeka code base and this function was not found in either. Placing
<?php if (function_exists('exhibit_builder_get_exhibits')): ?>
<p>Test two</p>
<?php endif; ?>
in a theme's index.php with Exhibit Builder activated fails to print "Test two". I discovered this because I am trying to list the exhibits and thought this would return an array of exhibits I could step through.