3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php mb_internal_encoding('UTF-8'); echo mb_encode_mimeheader('®', 'UTF-8', 'B');
Output for 4.3.0 - 5.6.28, hhvm-3.10.0 - 3.12.0, 7.0.0 - 7.1.0
=?UTF-8?B?wq4=?=