3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $a=array(); if (!a) echo 'true';
Output for 7.2.0 - 7.2.6
Warning: Use of undefined constant a - assumed 'a' (this will throw an Error in a future version of PHP) in /in/9vvhY on line 3
Output for 4.3.0 - 7.1.20
Notice: Use of undefined constant a - assumed 'a' in /in/9vvhY on line 3