3v4l.org

run code in 200+ php & hhvm versions
<?php $in = '\u00E3\u0081\u0082a'; $out = preg_replace_callback('/\\\\u[0-9A-F]{4}/', function ($matches) { return hex2bin(substr($matches[0], -2, 2)); }, $in); echo $out;

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

Output for branch php-master
あa
Output for branch php-master+opcache
あa
Output for branch php-master+jit
あa

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