3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $test = array( `foo` => 123, bar => 456, );
Output for 7.2.0 - 7.3.0alpha1
Warning: Use of undefined constant bar - assumed 'bar' (this will throw an Error in a future version of PHP) in /in/IeV8N on line 5
Output for 4.3.0 - 7.1.10
Notice: Use of undefined constant bar - assumed 'bar' in /in/IeV8N on line 5