3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $TEST = ""; if ($TEST.is_null) echo "true"; else echo "false";
Output for 7.2.0 - 7.3.0rc6
Warning: Use of undefined constant is_null - assumed 'is_null' (this will throw an Error in a future version of PHP) in /in/tnZEk on line 5 true
Output for 4.3.0 - 7.1.20
Notice: Use of undefined constant is_null - assumed 'is_null' in /in/tnZEk on line 5 true