3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php system('echo "A"');
Output for 5.4.1 - 5.4.2, 5.4.41 - 7.2.0
Output for 5.3.13 - 5.3.29, 5.4.3 - 5.4.40
A