<?php
function is_prime($n) {
if ($n <= 1) {
return false;
} elseif ($n <= 3) {
return true;
} elseif (($n % 2 == 0) || ($n % 3 == 0)) {
return false;
}
$i = 5;
while ($i * $i <= $n) {
if (($n % $i == 0) || ($n % ($i + 2) == 0)) {
return false;
$i = $i + 6;
}
}
return true;
}
function prime_gen() {
for($x=0; $x< PHP_INT_MAX; $x++) {
if(is_prime($x)){
yield $x;
}
}
}
function nth_prime($n) {
$nth = 0;
foreach (prime_gen() as $prime) {
if (++$nth >= $n) {
break;
}
}
return $prime;
}
echo nth_prime(9);
- Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.38, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
- 23
preferences:
238.74 ms | 404 KiB | 325 Q