- mb_decode_mimeheader: documentation ( source)
- mb_internal_encoding: documentation ( source)
<?php
mb_internal_encoding('ISO-8859-1');
echo 'Subject: ', mb_decode_mimeheader('=?ISO-8859-1?B?0JTQvtCx0LDQstC70LXQvSDQvdC+0LLRi9C5INC60L4=?=
=?ISO-8859-1?B?0LzQvNC10L3RgtCw0YDQuNC5INC6INC30LDQv9C40YHQuDogIns=?=
=?ISO-8859-1?B?UEFHRV9USVRMRX0i?=');