rrd_fetch

(PECL rrd >= 0.9.0)

rrd_fetch — Fetch the data for graph as array

说明

rrd_fetch ( string $filename , array $options ) : array

Gets data for graph output from RRD database file as array. This function has same result as rrd_graph(), but fetched data are returned as array, no image file is created.

参数

filename: RRD database file name.
options: Array of options for resolution specification.

返回值

Returns information about retrieved graph data.

User Contributed Notes

stephanecharette at gmail dot com 06-Sep-2013 05:50


For example, this worked for me:



<?php

$result = rrd_fetch( "mydata.rrd", array( "AVERAGE", "--resolution", "60", "--start", "-1d", "--end", "start+1h" ) );

?>



This will fetch all fields.  You then have to use something like this to get to a specified rrd field:



<?php

foreach ( $result["data"]["myfield"] as $key => $value )

{

    echo "At timestamp $key, the value for myfield is $value.\n";

}

?>

ernestas at versme dot net 21-Aug-2013 12:56


A few years ago, the extension was patched so that it would count options itself. But for me, it's buggy (it does not work with more than 3 arguments) and neither does work.