protected function decodeContentTransfer($encodedString, $encodingType) { $encodingType = strtolower($encodingType); if ($encodingType == 'base64') { return base64_decode($encodedString); } elseif ($encodingType == 'quoted-printable') { return quoted_printable_decode($encodedString); } else { return $encodedString; //8bit, 7bit, binary } }