3v4l.org

run code in 500+ PHP versions simultaneously
<?php $a = []; $a += ['a', 'b']; $a += ['c', 'd'];
Output for 8.2.31 - 8.2.32, 8.3.0 - 8.3.32, 8.4.1 - 8.4.23, 8.5.0 - 8.5.8

preferences:
55.32 ms | 758 KiB | 4 Q