mulyaxisex1.php
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<?php // content="text/plain; charset=utf-8"
require_once ("jpgraph/jpgraph.php");
require_once ("jpgraph/jpgraph_line.php");
 
$n = 8;
for($i=0; $i < $n; ++$i ) {
    $datay[$i] = rand(1,10);
    $datay2[$i] = rand(10,55);
    $datay3[$i] = rand(200,600);
    $datay4[$i] = rand(500,800);
}
 
// Setup the graph
$graph = new Graph(450,250);
$graph->SetMargin(40,150,40,30);
$graph->SetMarginColor('white');
 
$graph->SetScale('intlin');
$graph->title->Set('Using multiple Y-axis');
$graph->title->SetFont(FF_ARIAL,FS_NORMAL,14);
 
$graph->SetYScale(0,'lin');
$graph->SetYScale(1,'lin');
$graph->SetYScale(2,'lin');
 
$p1 = new LinePlot($datay);
$graph->Add($p1);
 
$p2 = new LinePlot($datay2);
$p2->SetColor('teal');
$graph->AddY(0,$p2);
$graph->ynaxis[0]->SetColor('teal');
 
$p3 = new LinePlot($datay3);
$p3->SetColor('red');
$graph->AddY(1,$p3);
$graph->ynaxis[1]->SetColor('red');
 
$p4 = new LinePlot($datay4);
$p4->SetColor('blue');
$graph->AddY(2,$p4);
$graph->ynaxis[2]->SetColor('blue');
 
// Output line
$graph->Stroke();
?>