3v4l.org

run code in 300+ PHP versions simultaneously
<?php $test = 'a'; $test2 = 'b'; $test3 = $test ?? $test2; print $test3;
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.19, 8.3.0 - 8.3.7
a

preferences:
44.6 ms | 402 KiB | 62 Q