3v4l.org

run code in 300+ PHP versions simultaneously
<?php $str = 'a,b,c'; $out = array_fill_keys(explode(',', $str), null); var_dump($out);
Output for 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
array(3) { ["a"]=> NULL ["b"]=> NULL ["c"]=> NULL }
preferences:
104.04 ms | 1489 KiB | 4 Q