3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $city = 'Monterrey'; echo (preg_match('/^(Guadalajara|Monterrey|Puebla)$/i', $city) && $age >= 18);
based on YbGAR
Output for 5.0.4 - 7.2.0
Notice: Undefined variable: age in /in/fBEKc on line 4
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: age in /in/fBEKc on line 4