The header part id is determined based on which part of the message is being viewed. Attached messages, for instance have headers of their own, like the message body, these headers are retrieved using a part id. The Mail_IMAP::_defaultHeaderPid() determines which is the proper part id for headers, whereas Mail_IMAP::getRawHeaders() and Mail_IMAP::getHeaders() selects the right headers to return or parse for the current message part.
Warning: As a method used internally by Mail_IMAP, Mail_IMAP::_defaultHeaderPid() 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||&$mid The message id.|
|param||str||$pid The part id.|
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