3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php if (isset($_GET['v'])) { $var=$_GET['v']; if (preg_match('/[^A-Z]/', $var)) { echo "fail"; } else { echo "success"; } }
based on tJlE2
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3