3v4l.org

run code in 300+ PHP versions simultaneously
<?php function is_prime($num) { $n = $num - 1; while ($n > 1) { if (is_int($num / $n)) { return false; } $n--; } return true; } header('Content-type: text/plain'); foreach (range(1,10) as $num) { if (is_prime($num)) { echo "$num is prime\n"; } else { echo "$num is not prime\n"; } }

preferences:
34.76 ms | 402 KiB | 5 Q