3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php $foo = array(); echo array_keys($foo);
based on uU12B
Output for 5.6.0 - 5.6.30, hhvm-3.15.4, 7.0.0 - 7.3.0rc3
Notice: Array to string conversion in /in/AoXhs on line 6 Array