require __DIR__ . '/vendor/autoload.php';

use Symfony\Component\VarExporter\ProxyHelper;

function prepare(string $foo): string
{
    echo "calling prepare\n";

    return 'prepared ' . $foo;
}

class Foobar
{
    public function __construct(
        public private(set) string $foo,
    ) {
    }

    public private(set) string $fooPrepared {
        get => $this->fooPrepared ??= prepare($this->foo);
    }

    // this version works
    // public private(set) string $fooPrepared = 'prepared foo';
}

$foobar = new Foobar('foo');
dump($foobar->fooPrepared);
dump($foobar->fooPrepared);

$code = ProxyHelper::generateLazyGhost(new ReflectionClass(Foobar::class));
echo $code;