3v4l.org

run code in 300+ PHP versions simultaneously
<?php print_r([...[1, 2, 3], 4]);
Output for 7.4.0 - 7.4.30, 8.0.1 - 8.0.20, 8.1.0 - 8.1.7
Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 )

preferences:
18.34 ms | 409 KiB | 5 Q