(PECL rrd >= 0.9.0)
rrd_update — Updates the RRD database
$filename, array $options): boolUpdates the RRD database file. The input data is time interpolated according to the properties of the RRD database file.
filenameRRD database file name. This database will be updated.
optionsOptions for updating the RRD database. This is list of strings. See man page of rrd update for whole list of options.
成功した場合に true を、失敗した場合に false を返します。