3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $array = array("1","2","3","4"); $variable = end(array_keys($array)); echo $variable; ?>
based on K286g
Output for 7.0.0 - 7.2.0
Notice: Only variables should be passed by reference in /in/PeMXk on line 1 3
Output for 5.5.0 - 5.6.28
Strict Standards: Only variables should be passed by reference in /in/PeMXk on line 1 3