<?php

include(__DIR__ . "/src/Person4.php");

/**
 * @var Person4 $object     A person with name and age.
 */
$object = new Person4("Rasmus", 22);
echo $object->details();

$object = new Person4("Rasmus");
echo $object->details();

$object = new Person4();
echo $object->details();

var_dump($object);