3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php echo "Your user Agent is:". $_SERVER ['HTTP_USER_AGENT']; ?>
based on B1iUo
Output for 5.3.0 - 7.1.0
Notice: Undefined index: HTTP_USER_AGENT in /in/clLNJ on line 2 Your user Agent is:
Output for 4.3.0 - 5.2.17
Notice: Undefined index: HTTP_USER_AGENT in /in/clLNJ on line 2 Your user Agent is: