NullSafe.php

<?php
// before
$user = get_user($id);
if (!is_null($user)) {
    $address = $user->getAddress();
    if (!is_null($address)) {
        $state = $address->state;
        If (!is_null($state)) {
            // And so on.
        }
    }
}

//after
$state = get_user($id)?->getAddress()?->state;