Generate prime numbers using the Sieve of Eratosthenes, Lazily evaluted with PHP

Sieve_of_Eratosthenes.php

<?php

// Generate prime numbers using the Sieve of Eratosthenes
// Lazily evaluted
// Inspired by: https://www.youtube.com/watch?v=5jwV3zxXc8E

$primes = sieve(nat(2));

foreach ($primes as $value) {
    echo $value . PHP_EOL;
    if ($value > 30) {
        return;
    }
}

function nat(int $start)
{
    yield $start;
    yield from nat($start + 1);
}

function sieve(Generator $numbers)
{
    $number = $numbers->current();
    $numbers->next();
    yield $number;
    yield from sieve(filterMultiplesOf(remaining($numbers), $number));
}

function remaining(Generator $generator)
{
    yield from $generator;
}

function filterMultiplesOf(Generator $numbers, int $number)
{
    foreach ($numbers as $next) {
        if ($next % $number !== 0) {
            yield $next;
        }
    }
}