3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $arr = array(-1, -3, 0); echo arr; ?>
Output for 7.2.0
Warning: Use of undefined constant arr - assumed 'arr' (this will throw an Error in a future version of PHP) in /in/R9TGv on line 4 arr
Output for 4.3.0 - 7.1.10
Notice: Use of undefined constant arr - assumed 'arr' in /in/R9TGv on line 4 arr