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 - 8.2.31, 8.3.0 - 8.3.31, 8.4.1 - 8.4.22, 8.5.0 - 8.5.7
Array ( [b] => 1 [c] => 2 )
preferences:
64.43 ms | 868 KiB | 4 Q