3v4l.org

run code in 150+ php & hhvm versions
Bugs & Features
<?php mb_internal_encoding('UTF-8'); echo 'Subject: ', mb_encode_mimeheader('Message de réponse de Kraft Foods', 'UTF-8', 'B');
Output for 4.3.0 - 7.1.0
Subject: Message de =?UTF-8?B?csOpcG9uc2UgZGUgS3JhZnQgRm9vZHM=?=