<? ## the following line is only needed if built as a self-contained ## extension.  If you build the rrdtool module as an embedded ## extension, the rrd_* functions will always be available, so you ## do not need the dl() call. dl("rrdtool.so"); ## ## demonstration of the rrd_graph() command ##   $opts = array( "--start", "-4d",                   "DEF:in=/dir/router-port2.rrd:input:AVERAGE",                  "DEF:out=/dir/router-port2.rrd:output:AVERAGE",                  "LINE2:in#0000ff:Incoming Traffic Avg.",                  "PRINT:in:AVERAGE:incoming\: %1.2lf b/s",                  "PRINT:in:AVERAGE:incoming2\: %1.2lf b/s"                );   $ret = rrd_graph("/some-dir/router-port2.gif", $opts, count($opts));   ##   ## if $ret is an array, then rrd_graph was successful   ##   if ( is_array($ret) )   {       echo "Image size:  $ret[xsize] x $ret[ysize]\n";              ##       ## all results from any PRINT commands will be       ## in the array $ret[calcpr][..]       ##       echo "rrd_graph1 print results: \n";       for ($i = 0; $i < count($ret[calcpr]); $i++)           echo $ret[calcpr][$i] . "\n";   }   else   {       $err = rrd_error();       echo "rrd_graph() ERROR: $err\n";   }?>