3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $t = strtoupper;
Output for 7.2.0
Warning: Use of undefined constant strtoupper - assumed 'strtoupper' (this will throw an Error in a future version of PHP) in /in/XkpfA on line 3
Output for 5.3.19 - 7.1.10
Notice: Use of undefined constant strtoupper - assumed 'strtoupper' in /in/XkpfA on line 3