3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $num = ' '; if (isset(trim($num))) { echo 'true'; } else { echo 'false'; }
Output for hhvm-3.10.0 - 3.12.0
true
Output for 5.3.0 - 5.4.30
Fatal error: Can't use function return value in write context in /in/Eir9p on line 5
Process exited with code 255.