// include your classes above this code
$data1y=array(10,55,50,110);

// Create the graph. These two calls are always required
$graph = new Graph(800,457,'auto');
$graph->SetScale("textlin");

$theme_class=new UniversalTheme;
$graph->SetTheme($theme_class);

// $graph->yaxis->SetTickPositions(array(0,30,60,90,120,150), array(15,45,75,105,135));
$graph->SetBox(false);

$graph->ygrid->SetFill(false);
$graph->xaxis->SetTickLabels(array('Minimum Score', 'Section Average', 'Your Score', 'Maximum Score'));
$graph->yaxis->HideLine(false);
$graph->yaxis->HideTicks(false,false);

// Create the bar plots
$b1plot = new BarPlot($data1y);
// ...and add it to the graph
$graph->Add($b1plot);

$graph->title->Set("Demo Graph Test");

$contentType = 'image/png';
$gdImgHandler = $graph->Stroke(_IMG_HANDLER);

// @see http://stackoverflow.com/a/9084110/126431
ob_start();                        // start buffering
$graph->img->Stream();             // print data to buffer
$graphData = ob_get_contents();   // retrieve buffer contents
ob_end_clean();                    // stop buffer

// outputting this in a HTML tag would work like this:
// $graphBase64 = "data:$contentType;base64," . base64_encode($graphData);
// echo sprintf('<img src="%s" alt="Graph">', $graphBase64);

$pdf->Image('@'.$graphData);