- 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?0J3QvtCy0YvQuSDQvtGC0LfRi9CyINC+INCx0LDQvdA=?=
=?ISO-8859-1?B?utC1?=');