(PHP 4, PHP 5, PHP 7)
imap_fetchheader — Returns header for a message
$imap_stream
, int $msg_number
[, int $options = 0
] )This function causes a fetch of the complete, unfiltered » RFC2822 format header of the specified message.
imap_stream由 imap_open() 返回的 IMAP 流。
msg_numberThe message number
options
The possible 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)
Returns the header of the specified message as a text string.