3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php strtoupper(nl123);
Output for 7.2.0
Warning: Use of undefined constant nl123 - assumed 'nl123' (this will throw an Error in a future version of PHP) in /in/6p0MZ on line 3
Output for 4.3.0 - 7.1.10
Notice: Use of undefined constant nl123 - assumed 'nl123' in /in/6p0MZ on line 3