(PHP 4, PHP 5)
imap_body — Read the message body
$imap_stream
   , int $msg_number
   [, int $options = 0
  ] )
    imap_body() returns the body of the message,
   numbered msg_number in the current
   mailbox.
  
imap_body() will only return a verbatim copy of the message body. To extract single parts of a multipart MIME-encoded message you have to use imap_fetchstructure() to analyze its structure and imap_fetchbody() to extract a copy of a single body component.
imap_stream由 imap_open() 返回的 IMAP 流。
msg_number
     The message number
options
     
       The optional options are a bit mask
       with one or more of the following:
       
FT_UID - The msg_number 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 body of the specified message, as a string.