3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $isRunning = null; if (! $isRunning) { echo "\nnull"; } $isRunning = false; if (! $isRunning) { echo "\nfalse"; } $isRunning = true; if (! $isRunning) { echo "\ntrue"; }
Output for 4.3.0 - 7.1.0
null false