Hide category and forum menu items that are restricted by Itthinx Groups

functions.php

<?php
/**
 * Menu items of categories and forums should be hidden if the user doesn't belong to the Group
 */
if ( !is_admin() ) {
	add_filter( 'wp_get_nav_menu_items', 'lenspiration_hide_groups_restricted_menu_items', 999, 3 );
}
function lenspiration_hide_groups_restricted_menu_items( $items = null, $menu = null, $args = null ) {
	$user_id = get_current_user_id();
	
	foreach ( $items as $key => $item  ) {
		error_log('Item: ' . var_export($item, true));
		if ( $item->type == "taxonomy" && class_exists( 'Groups_Restrict_Categories') && method_exists( 'Groups_Restrict_Categories', 'user_can_read_term' ) ) {
			if ( !Groups_Restrict_Categories::user_can_read_term( $user_id, $item->object_id ) ) {
				unset( $items[$key] );
			}
		} elseif ( $item->type == "forum" && class_exists( 'Groups_Post_Access' ) && method_exists( 'Groups_Post_Access', 'user_can_read_post' ) ) {
			if ( Groups_Post_Acceses::user_can_read_post( $item->object_id, $user_id ) ) {
				unset( $items[$key] );
			}
		}
	}
	
	// Remove any orphaned menu items whose parents have been removed
	foreach ( $items as $key => $item ) {
		$menu_item_parent = $item->menu_item_parent; 
		if ( $menu_item_parent != 0 ) {
			$match = false;
			foreach ( $items as $search_key => $search_item) {
				if( $search_item->ID == $menu_item_parent ) $match = true;
			}
			if( !$match ) {
				unset( $items[$key] );
			}
		}
	}
	
	return $items;
}