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.
An IMAP stream returned by imap_open().
The message number
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.