Count menu items

gistfile1.txt

<?php
	ob_start();
		wp_nav_menu(array('theme_location' => 'primary', 'menu_class' => 'nav navbar-nav'));
		$output = htmlspecialchars(ob_get_contents());
	ob_end_clean();
	$menu_items = substr_count($output,'li class');
?>

This is the most effective method I can find, probably not the best though.