3v4l.org

run code in 300+ PHP versions simultaneously
<?php $username = ''; $first_letter = $username[0] ?? '';
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
preferences:
93.38 ms | 406 KiB | 5 Q