run code in 200+ php & hhvm versions
Bugs & Features
<?php $x = array(); $x[4] = '??'; $x[1] = '!!'; var_dump($x);

Shows result from various feature-branches currently under review from the php developers. Contact me to have additional branches featured.

Archived branches

Once feature-branches are merged or declined, they are no longer available. Their functionality (when merged) can be viewed from the main output page