OOP PECL/rrd example
例1 OO usage of rrd
<?php
$rrdFile = dirname(__FILE__) . "/speed.rrd";
$outputPngFile = dirname(__FILE__) . "/speed.png";
$creator = new RRDCreator($rrdFile, "now -10d", 500);
$creator->addDataSource("speed:COUNTER:600:U:U");
$creator->addArchive("AVERAGE:0.5:1:24");
$creator->addArchive("AVERAGE:0.5:6:10");
$creator->save();
$updater = new RRDUpdater($rrdFile);
$updater->update(array("speed" => "12345"), "920804700");
$updater->update(array("speed" => "12357"), "920805000");
$graphObj = new RRDGraph($outputPngFile);
$graphObj->setOptions(
array(
"--start" => "920804400",
"--end" => 920808000,
"--vertical-label" => "m/s",
"DEF:myspeed=$rrdFile:speed:AVERAGE",
"CDEF:realspeed=myspeed,1000,*",
"LINE2:realspeed#FF0000"
)
);
$graphObj->save();
?>
忘却曲線を使ってこの知識を確実に記憶に残す
