Horde_Mime_Part::getPrimaryType PHP Method

    public function getPrimaryType()
    {
        return $this->_headers['content-type']->ptype;
    }

 /**
  * Determines if a MIME type is an attachment.
  *
  * @param Horde_Mime_Part $part  The MIME part.
  */
 public static function isAttachment(Horde_Mime_Part $part)
 {
     $type = $part->getType();
     switch ($type) {
         case 'application/ms-tnef':
         case 'application/pgp-keys':
         case 'application/vnd.ms-tnef':
             return false;
     }
     if ($part->parent) {
         switch ($part->parent->getType()) {
             case 'multipart/encrypted':
                 switch ($type) {
                     case 'application/octet-stream':
                         return false;
                 }
                 break;
             case 'multipart/signed':
                 switch ($type) {
                     case 'application/pgp-signature':
                     case 'application/pkcs7-signature':
                     case 'application/x-pkcs7-signature':
                         return false;
                 }
                 break;
         }
     }
     switch ($part->getDisposition()) {
         case 'attachment':
             return true;
     }
     switch ($part->getPrimaryType()) {
         case 'application':
             if (strlen($part->getName())) {
                 return true;
             }
             break;
         case 'audio':
         case 'video':
             return true;
         case 'multipart':
             return false;
     }
     return false;
 }