3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php echo gettype(x23);
Output for 7.2.0
Warning: Use of undefined constant x23 - assumed 'x23' (this will throw an Error in a future version of PHP) in /in/sucXP on line 2 string
Output for 5.5.0 - 7.1.10
Notice: Use of undefined constant x23 - assumed 'x23' in /in/sucXP on line 2 string
Output for 4.3.0 - 5.4.45
string