3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $string1 = hello; strtoupper ( $string1 ); echo $string1; ?>
Output for 7.2.0
Warning: Use of undefined constant hello - assumed 'hello' (this will throw an Error in a future version of PHP) in /in/gjMl6 on line 1 hello
Output for 4.3.0 - 7.1.10
Notice: Use of undefined constant hello - assumed 'hello' in /in/gjMl6 on line 1 hello