3v4l.org

run code in 300+ PHP versions simultaneously
<?php $null = null; $null['foo'] = 1; // $null is an array now var_dump($null);
Output for 4.3.0, 5.5.24, 7.1.0 - 7.1.33, 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 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13
array(1) { ["foo"]=> int(1) }
preferences:
87.06 ms | 408 KiB | 5 Q