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Example #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 ();
 ?>