3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php shell_exec(top); ?>
Output for 7.2.0 - 7.3.0rc4
Warning: Use of undefined constant top - assumed 'top' (this will throw an Error in a future version of PHP) in /in/vhV9o on line 1
Output for 4.3.0 - 7.1.20
Notice: Use of undefined constant top - assumed 'top' in /in/vhV9o on line 1