(PECL rrd >= 0.9.0)
rrd_update — Updates the RRD database.
Updates the RRD database. The input data is time interpolated according to the properties of the RRD database file.
Filename for RRD database file, which will be updated.
Options for rrd create - list of strings. See man page of rrd update for whole list of options.
Returns TRUE on success, FALSE when error occurs.