(PHP 4, PHP 5, PHP 7)
imap_fetchheader — Returns header for a message
imap_fetchheader ( resource $imap_stream , int $msg_number [, int $options = 0 ] ) : string
This function causes a fetch of the complete, unfiltered » RFC2822 format header of the specified message.
imap_stream
An IMAP stream returned by imap_open().
msg_number
The 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.
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https://www.php.net/manual/en/function.imap-fetchheader.php