3v4l.org

run code in 300+ PHP versions simultaneously
<?php $array = []; $array['3'] = null; var_dump($array);
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
array(1) { [3]=> NULL }

preferences:
143.25 ms | 402 KiB | 150 Q