Searches a message's structure to see if a multipart/$subtype MIME type appears, where $subtype is one of related or mixed. This is done by calling on Mail_IMAPv2::extractMIME() internally. If the multipart/related MIME type appears in a message's parsed structure, Mail_IMAPv2::_scanMultipart() uses the presence of that MIME type to adjust to anomolies in the message's stucture.
Warning: For most messages, the multipart/related MIME type does not appear in the parsed structure of the message. Therefore, Mail_IMAPv2::_isMultipart() should not be used to determine whether a message is a multipart/related message. The Mail_IMAPv2::getRelatedParts() method is provided to determine whether a message has related parts.
Warning: As a method used internally by Mail_IMAPv2, Mail_IMAPv2::_isMultipart() should not be used directly. Its API has the potential of being changed in future releases, should I find a more efficient approach.
| param | int | &$mid message id |
| param | str | $subtype The subtype to search for. |
| return | bool | |
| access | private | |
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