PrimeNumbers

<?php

function generatePrimes($howMany)
{
    $numbers = [];


    $i = 2;
    while (count($numbers) < (int) $howMany) {

        for ($j = 2; $j < $i - 1; $j++) {

            $rs = ($i % $j === 0);

            if ($rs) {
                $i++;
                continue 2;
            }
        }

        $numbers[] = $i;

        $i++;
    }

    return $numbers;
}
$primes    = generatePrimes(10001);
$lastPrime = end($primes);
print_r($lastPrime);