3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php var_dump((unset) b);
Output for 7.2.0
Deprecated: The (unset) cast is deprecated in /in/NvkHh on line 2 Warning: Use of undefined constant b - assumed 'b' (this will throw an Error in a future version of PHP) in /in/NvkHh on line 2 NULL
Output for 4.3.0 - 7.1.10
Notice: Use of undefined constant b - assumed 'b' in /in/NvkHh on line 2 NULL