$y = explode(',', $data);

$systemPath = $_SESSION['gszButtonCachePath'].$id.'.png';

$graph = new Graph(400, 200, $systemPath);
$graph->setScale('textlin');

$lineplot = new LinePlot($y);
$lineplot->setColor('blue');

$graph->Add($lineplot);

$graph->xaxis->scale->ticks->Set(30);
$graph->xaxis->scale->ticks->Set(4);

$graph->Stroke($systemPath);