3v4l.org

run code in 300+ PHP versions simultaneously
<?php $test = null; $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
b

preferences:
74.73 ms | 406 KiB | 63 Q