3v4l.org

run code in 300+ PHP versions simultaneously
<?php function f(?int $x = null) { echo $x ? 'Present' . $x : 'Not present'; } f(); echo PHP_EOL; f(1);
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.30, 8.0.0 - 8.0.20, 8.1.0 - 8.1.7
Not present Present1

preferences:
53.86 ms | 409 KiB | 5 Q