3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php if (!$undefined_var) { $undefined_var = 'world'; }
based on 6pu8c
Output for 5.0.4 - 7.1.0
Notice: Undefined variable: undefined_var in /in/YfeuS on line 3
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: undefined_var in /in/YfeuS on line 3