3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php mb_internal_encoding('UTF-8'); echo 'Subject: ', mb_encode_mimeheader('℠', 'UTF-8', 'B');
Output for 4.3.0 - 5.6.28, hhvm-3.12.0, 7.0.0 - 7.1.0
Subject: =?UTF-8?B?4oSg?=
Output for hhvm-3.10.0

Process exited with code 153.