3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php echo ++$undef;
Output for 5.0.4 - 7.2.0
Notice: Undefined variable: undef in /in/Vh9tK on line 3 1
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: undef in /in/Vh9tK on line 3 1