Fetch the MIME headers of a particular section of the body of the specified messages.
An IMAP\Connection instance.
The message number
The part number. It is a string of integers delimited by period which index into a body part list as per the IMAP4 specification
A bitmask with one or more of the following:
FT_UID - The message_num is a UID
FT_PEEK - Do not set the \Seen flag if not already set
FT_INTERNAL - The return string is in internal format, will not canonicalize to CRLF.
Returns the MIME headers of a particular section of the body of the specified messages as a text string, or false on failure.
|The imap parameter expects an IMAP\Connection instance now; previously, a resource was expected.