3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php strtoupper(nl123);
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Use of undefined constant nl123 - assumed 'nl123' in /in/6p0MZ on line 3