3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $api_key = array( '29301333' => 'aaaa', '29301334' => 'aaaabbbb' ); echo $api_key['fd'] ?>
Output for 5.3.0 - 7.2.0
Notice: Undefined index: fd in /in/4G5mO on line 6
Output for 4.3.0 - 5.2.17
Notice: Undefined index: fd in /in/4G5mO on line 6