This function causes a fetch of a particular section of
the body of the specified messages as a text string and
returns that text string. The section specification is a
string of integers delimited by period which index into a
body part list as per the IMAP4 specification. Body parts are
not decoded by this function.
The options for imap_fetchbody()
is a bitmask with one or more of the following:
FT_INTERNAL - The return string is in "internal"
format, without any attempt to canonicalize CRLF.
See also: imap_fetchstructure().