PHP 函数返回值的类型是否可以为数组、对象或类的实例？

<?php
function getArray(): array
{
    return [1, 2, 3];
}
?>

<?php
class Person
{
    private $name;

    public function __construct(string $name)
    {
        $this->name = $name;
    }

    public function getName(): string
    {
        return $this->name;
    }
}

function getObject(): Person
{
    return new Person('John Doe');
}
?>

<?php
class Animal
{
    private $species;

    public function __construct(string $species)
    {
        $this->species = $species;
    }

    public function getSpecies(): string
    {
        return $this->species;
    }
}

function getInstance(): Animal
{
    return Animal('Dog');
}
?>

function getUsers(): array
{
    // ... 数据库查询，返回用户数组
}

<?php

$users = getUsers();

// 遍历用户数组
foreach ($users as $user) {
    // ...
}
?>

function createUser(string $name, string $email): Person
{
    // ... 数据库查询，返回新的用户对象
}

<?php

$user = createUser('John Doe', 'john.doe@example.com');

// 访问用户属性
echo $user->getName(); // 输出：John Doe
?>