3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php trim($num) = ' '; if (isset($num)) { echo 'true'; } else { echo 'false'; }
Output for 5.3.0 - 5.4.30
Fatal error: Can't use function return value in write context in /in/Z75lm on line 3
Process exited with code 255.