3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php if (empty($mystring)) { echo 'empty'; } if ($mystring == null) { echo 'null'; // and warning }
Output for 5.0.4 - 5.6.28, hhvm-3.10.0 - 3.13.2, 7.0.0 - 7.1.0
empty Notice: Undefined variable: mystring in /in/k1EqU on line 6 null
Output for 4.3.0 - 5.0.3
empty Notice: Undefined variable: mystring in /in/k1EqU on line 6 null