Minimalist Prime numbers generator in PHP (version >= 7.4) - Can you make it shorter?

primes.php

<?php

/**
 * Run this code with: "php -n <file.php>" to make sure no configuration will be used
 * so xdebug will not be used either.
 */

declare(strict_types=1);

function primesGenerator(Iterator $iterator): Generator
{
    yield $primeNumber = $iterator->current();

    $iterator = new \CallbackFilterIterator(
        $iterator,
        fn(int $a): bool => $a % $primeNumber !== 0
    );

    $iterator->next();

    return $iterator->valid() ?
        yield from primesGenerator($iterator):
        null;
}

function integerGenerator(int $init = 1, callable $succ): Generator
{
    yield $init;

    return yield from integerGenerator($succ($init), $succ);
}

$primes = primesGenerator(integerGenerator(2, fn(int $n): int => $n + 1));

foreach ($primes as $p) {
    var_dump($p);
}