3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php system('/usr/bin/w');
Output for 7.1.10

Process exited with code 137.
Output for 4.3.0, 5.4.45 - 7.1.7
Output for 4.3.1 - 5.4.44
sh: 1: /usr/bin/w: not found