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(PECL rrd >= 0.9.0)
rrd_first — Gets the timestamp of the first sample from rrd file
Returns the first data sample from the specified RRA of the RRD file.
fileRRD database file name.
raaindexThe index number of the RRA that is to be examined. Default value is 0.
Integer number of unix timestamp, o false in caso di fallimento.
