3v4l.org

run code in 300+ PHP versions simultaneously
<?php $update = [1]; $arr = []; $update && $arr[] = 1; var_dump($arr);
Output for 8.1.0 - 8.1.31, 8.2.0 - 8.2.26, 8.3.0 - 8.3.15, 8.4.1 - 8.4.2
array(1) { [0]=> int(1) }
preferences:
63.78 ms | 406 KiB | 5 Q