imap_fetchheader

(PHP 4, PHP 5, PHP 7, PHP 8)

imap_fetchheader — Returns header for a message

说明

imap_fetchheader ( resource $imap , int $message_num , int $flags = 0 ) : string|false

This function causes a fetch of the complete, unfiltered » RFC2822 format header of the specified message.

参数

imap

由 imap_open() 返回的 IMAP 流。

message_num

The message number

flags

The possible flags are:

  • FT_UID - The message_num 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)

返回值

Returns the header of the specified message as a text string, 或者在失败时返回 false.

参见