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run code in 200+ php & hhvm versions
Bugs & Features
<?php $match = preg_replace_callback(array('/\d/', '/a/'), function($matches)use(&$result){ $result[] = $matches; return '_'; }, 'ada2d1', 1); print_r($match);

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

Output for Typed properties v2
_da_d1
Output for Array change keys
_da_d1
Output for Lexical anon
_da_d1

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