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Description

string imap_fetchheader ( resource imap_stream, int msgno [, int options])

This function causes a fetch of the complete, unfiltered RFC2822 format header of the specified message as a text string and returns that text string.

The options are:

FT_UID          The msgno argument is a UID
FT_INTERNAL     The return string is in "internal" format,
                without any attempt to canonicalize to CRLF
                newlines
FT_PREFETCHTEXT The RFC822.TEXT should be pre-fetched at the
                same time.  This avoids an extra RTT on an
                IMAP connection if a full message text is
                desired (e.g. in a "save to local file"
                operation)