3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php if(!strstr(strtolower($_SERVER['HTTP_USER_AGENT']), "googlebot")) { echo 'You\'re not a google bot!'; }
Output for 5.3.0 - 7.2.0
Notice: Undefined index: HTTP_USER_AGENT in /in/KRij0 on line 2 You're not a google bot!
Output for 4.3.0 - 5.2.17
Notice: Undefined index: HTTP_USER_AGENT in /in/KRij0 on line 2 You're not a google bot!