interface IFoo {
    public function __construct(string $foo);

    public function doSomething(): void;
}

final class FooImpl implements IFoo {
    public function __construct(string $foo) {
        // ...
    }

    public function doSomething(): void {
        // ...
    }
}

function instantiate<T as IFoo>(class<T> $class, string $foo): T {
    return new $class($foo);
}

function test(): void {
    $foo = instantiate::<FooImpl>(FooImpl::class, 'bar');

    $foo->doSomething();
}