3v4l.org

run code in 500+ PHP versions simultaneously
<?php $a = [1]; $a = [1,1] + [1,2,1]; var_dump($a);
Output for 8.0.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array(3) { [0]=> int(1) [1]=> int(1) [2]=> int(1) }
preferences:
42.89 ms | 706 KiB | 4 Q