(PHP 4 >= 4.0.6, PHP 5)
mb_decode_mimeheader() decodes encoded-word string str in MIME header.
It returns decoded string in internal character encoding.
See also mb_encode_mimeheader().
Using quoted-printable-encoding the hex-numbers must be written in uppercase letters! Works: =?iso-8859-1?q?=3F=3F=3F?= Fails: =?iso-8859-1?q?=3f=3f=3f?=