3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php echo $_SERVER['HTTP_USER_AGENT']; ?>
based on 2JVo2
Output for 5.3.0 - 7.2.0
Notice: Undefined index: HTTP_USER_AGENT in /in/q6CEB on line 2
Output for 4.3.0 - 5.2.17
Notice: Undefined index: HTTP_USER_AGENT in /in/q6CEB on line 2