3v4l.org

run code in 500+ PHP versions simultaneously
<?php echo 'aa'.null . 'xxx';
Output for 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
aaxxx
preferences:
38.97 ms | 700 KiB | 4 Q