3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php var_dump(array_flip(preg_split('(\s+)', '', 0, PREG_SPLIT_NO_EMPTY)));
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
array(0) { }