3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php echo "Your User Agent Is: ".$_SERVER['HTTP_USER_AGENT']; ?>
based on kCElE
Output for 5.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
Notice: Undefined index: HTTP_USER_AGENT in /in/XTq6R on line 2 Your User Agent Is:
Output for 4.3.0 - 5.2.17
Notice: Undefined index: HTTP_USER_AGENT in /in/XTq6R on line 2 Your User Agent Is: