rrd_xport

an example that shows the usage of this method ( tested in php version 5.6.30 )class Rrd{    public function getData($id , $start , $end)    {        $step = 300 ;        $rrdFile ="/path/to/file/'.$id.rrd";        try{            $options = ["--start", $start , "--end", $end ,"-- step",$step,"DEF:out=$rrdFile:name:AVERAGE", "XPORT:out:test"];            $result = rrd_xport($options);            $datas = $result['data'][0]['data'];            foreach($datas as $data => $value){                if( is_nan($value) === true ) $value = 0 ;                    $output[] = [$data=>$value] ;            }            return json_encode($output);        }catch (Exception $e){            dd($e->getMessage());        }    }}

A small example of connecting to an rrdcached daemon (This one running on localhost, but works across network as well) and getting in and output bits from an interface.$options = array(    '--daemon', '127.0.0.1:42217',    '--start', time() - 3600,    'DEF:in_oct=rrdfile.rrd:INOCTETS:AVERAGE',    'DEF:out_oct=rrdfile.rrd:OUTOCTETS:AVERAGE',    'CDEF:in_bits=in_oct,8,*',    'CDEF:out_bits=out_oct,8,*',    'XPORT:in_bits',    'XPORT:out_bits'  );$result = rrd_xport($options);var_dump($result);