3v4l.org

run code in 500+ PHP versions simultaneously
<?php $data = null; var_export($data['key'] ?? null);
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 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
NULL
preferences:
89.68 ms | 1258 KiB | 4 Q