Show Secondary Navigation to Logged In Users Only

Some users would like to hide the secondary navigation from unregistered visitors and display to logged in users only. This can be done with the following PHP snippet:

add_filter( 'has_nav_menu', 'tu_disable_secondary_nav_logged_out', 10, 2 );
function tu_disable_secondary_nav_logged_out( $has_nav_menu, $location ) {
if ( 'secondary' === $location && ! is_user_logged_in() ) {
return false;
}

return $has_nav_menu;
}