3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php function x(){ print 'asd'; } echo serialize(x);
Output for 7.2.0
Warning: Use of undefined constant x - assumed 'x' (this will throw an Error in a future version of PHP) in /in/H2Aua on line 8 s:1:"x";
Output for 4.3.0 - 7.1.10
Notice: Use of undefined constant x - assumed 'x' in /in/H2Aua on line 8 s:1:"x";