Hide bbPress forums protected with PMPro and PMPro bbPress from users who don't have access.

my_pmpro_search_filter_post_types.php

/*
	By default pmpro-bbpress will hide topics and replies within a forum, but
	will still show the member forums in the forums list.
	
	You can use this code to hide forums from that list.
	
	Note that you should tweak the post_type array there
	if you are already using the "Filter Searches and Archives" option
	to hide other post types.
*/
//function to tell PMPro to hide forums or also hide forums in searches
function my_pmpro_search_filter_post_types($post_types)
{
	//$post_types = array("page", "post", "forums");	//use this one if you want to keep pages and posts out of searches also
	$post_types = array("forum");
	return $post_types;
}
add_filter('pmpro_search_filter_post_types', 'my_pmpro_search_filter_post_types');

//this line overrides the "Filter searches and archives?" advanced setting to turn it on
add_filter( 'pre_get_posts', 'pmpro_search_filter' );