3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php @$undef; debug_zval_dump ( $undef );
based on e8M4H
Output for 7.0.0 - 7.2.0
Notice: Undefined variable: undef in /in/KrMWH on line 4 NULL
Output for 5.0.4 - 5.6.28
Notice: Undefined variable: undef in /in/KrMWH on line 4 NULL refcount(1)
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: undef in /in/KrMWH on line 4 NULL refcount(1)