Unnamed

<?function check_sieve ($sieve, $n){  $sqrt_n = sqrt($n);  foreach ($sieve as $prime)    if ((floor($n) % $prime == 0))      return false;    else if ($sqrt_n < $prime)      return true;  return true;}function generate_primes ($max){  $sieve = array(2, 3, 5, 7);  for ($i = 11; $i < $max; $i += 2)    if (check_sieve($sieve, $i))      $sieve[] = $i;  return $sieve;}$stime = microtime(true);print_r(generate_primes(500));printf("%01.5f",microtime(true)-$stime);?>