function getName(final Context $context) {
    final $name = $context->isFormal() ? "Rodrigues" : "David";

    // Note that "$name" is final.
    // Now I cannot change the $name variable.
    // { ... do something else }

    return $name;
}

echo getName(new FormalContext());   // Print "Rodrigues"
echo getName(new InformalContext()); // Print "David"

// Note that the "$name" is final, but it have two different values depending of the context.