3v4l.org

run code in 200+ php & hhvm versions
Bugs & Features
<?php mb_internal_encoding('UTF-8'); echo 'Subject: ', mb_encode_mimeheader('Par téléphone', 'UTF-8', 'B');
Output for 4.3.0 - 5.6.30, hhvm-3.10.1 - 3.11.1, hhvm-3.13.2 - 3.17.3, 7.0.0 - 7.2.0
Subject: Par =?UTF-8?B?dMOpbMOpcGhvbmU=?=
Output for hhvm-3.12.14

Process exited with code 137.