3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $username = $_POST['username'];
based on kgRHD
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
Notice: Undefined index: username in /in/USvL5 on line 3