3v4l.org

run code in 500+ PHP versions simultaneously
<?php // very slow $total = @$x; // looks weird $total = $x ?? null; // lengthy if (!isset($x)) { $total = null; } else { $total = $x; } ?>
Output for 8.1.34, 8.2.0 - 8.2.32, 8.3.0 - 8.3.32, 8.4.1 - 8.4.23, 8.5.0 - 8.5.8

preferences:
36.88 ms | 872 KiB | 4 Q