範例 #1 rrd 的程序式用法
<?php
$rrdFile = dirname(__FILE__) . "/speed.rrd";
//建立 RRD 檔案
rrd_create($rrdFile,
array(
"--start",920804400,
"DS:speed:COUNTER:600:U:U",
"RRA:AVERAGE:0.5:1:24",
"RRA:AVERAGE:0.5:6:10"
)
);
//更新 RRD 檔案
rrd_update($rrdFile,
array(
"920804700:12345",
"920805000:12357"
)
);
//圖表輸出
rrd_graph(dirname(__FILE__) . "/speed.png",
array(
"--start", "920804400",
"--end", "920808000",
"--vertical-label", "m/s",
"DEF:myspeed=$rrdFile:speed:AVERAGE",
"CDEF:realspeed=myspeed,1000,*",
"LINE2:realspeed#FF0000"
)
);
?>