3v4l.org

run code in 300+ PHP versions simultaneously
<?php function func(true|null $a = NULL) { var_dump($a); var_export($a); } func(TRUE);
Output for 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
bool(true) true
preferences:
55.61 ms | 478 KiB | 5 Q