3v4l.org

run code in 500+ PHP versions simultaneously
<?php $a = ['b', ["c"]]; $a = ['b', [[[["c"]]]]]; $b = 1; $c = 2; $d = compact($a); print_r($d); ?>
Output for 8.1.32 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.21, 8.5.0 - 8.5.6
Array ( [b] => 1 [c] => 2 )
preferences:
33.18 ms | 852 KiB | 4 Q