php-typed-object-inflator.php

<?php

trait Inflates
{
    public function __construct(object $data)
    {
        $vars = get_class_vars(self::class);
        foreach ($vars as $key => $value) {
            $this->$key = $data->$key;
        }
    }
}

class Person
{
    use Inflates;

    public string $name;
    public int $age;
    public Position $position;
}

class Position
{
    public int $lat;
    public int $lng;
}

$data = (object) [
    'name' => 'James',
    'age' => 24,
    'position' => (object) [
        'lat' => 123,
        'lng' => 456,
    ],
];

$person = new Person($data);

var_dump($person);