3v4l.org

run code in 300+ PHP versions simultaneously
<?php $hello = ['wow' => false]; $yellow = ['wow' => true]; $bellow = $hello + $yellow; var_dump($bellow);
Output for 7.1.25 - 7.1.28, 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 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
array(1) { ["wow"]=> bool(false) }
preferences:
156.48 ms | 403 KiB | 162 Q