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 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
Not present Present1
preferences:
91.64 ms | 1482 KiB | 4 Q