buddypress "my profile" and "register" links

This is what I am using for bp profile links on navi menu bar.

// Filter wp_nav_menu() to add profile link
        add_filter( 'wp_nav_menu_items', 'my_nav_menu_profile_link' );
        function my_nav_menu_profile_link($menu) {
	        if (!is_user_logged_in())
		        return $menu;
        	else
	        	$profilelink = '<li><a href="' . bp_loggedin_user_domain( '/' ) . '">' . __('My Profile') . '</a></li>';
		        $menu = $menu . $profilelink;
        		return $menu;
        }

I need to add “Join Us” when you are not login. so I added like this

// Filter wp_nav_menu() to add profile link
        add_filter( 'wp_nav_menu_items', 'my_nav_menu_profile_link' );
        function my_nav_menu_profile_link($menu) {
	        if (!is_user_logged_in())
       	        $joinlink = '<li><a href="' . wp_register() . '">' . __('Register') . '</a></li>';
		        $menu = $menu . $joinlink;
		        return $menu;
        	else
	        	$profilelink = '<li><a href="' . bp_loggedin_user_domain( '/' ) . '">' . __('My Profile') . '</a></li>';
		        $menu = $menu . $profilelink;
        		return $menu;
        }

But it’s an error. how I can fix it to work?
Thanks all the time.