3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php if (isset($header[$last_key]['class'])) { echo 'set'; } else { echo 'not set'; }
based on OdKsP
Output for 5.0.4 - 5.6.28, hhvm-3.13.2, 7.0.0 - 7.1.0
Notice: Undefined variable: last_key in /in/h0Gtu on line 2 not set
Output for hhvm-3.10.0 - 3.12.0
not set
Output for 4.3.0 - 5.0.3
Notice: Undefined variable: last_key in /in/h0Gtu on line 2 not set