3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $string1 = hello; strtoupper ( $string1 ); echo $string1; ?>
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 hello - assumed 'hello' in /in/gjMl6 on line 1 hello