3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $foo[] = x;
Output for 7.2.0 - 7.3.0rc4
Warning: Use of undefined constant x - assumed 'x' (this will throw an Error in a future version of PHP) in /in/lYJRM on line 2
Output for 4.3.0 - 7.1.20
Notice: Use of undefined constant x - assumed 'x' in /in/lYJRM on line 2