3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php $header = array('test'); if (isset($header[0]['class'])) { echo $header[0]; } else { echo 'not set'; }
based on gJCOS
Output for 5.0.0 - 5.0.2, 5.4.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
not set
Output for hhvm-3.10.0

Process exited with code 153.
Output for 4.3.0 - 4.4.9, 5.0.3 - 5.3.29
test