3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $mystring = null; if (empty($mystring)) { echo "empty\n"; } if ($mystring == null) { echo "null\n"; // Notice: Undefined variable ... } if (!isset($mystring)) { echo "unset\n"; }
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
empty null unset
Output for hhvm-3.10.0

Process exited with code 153.