$chart = new Highchart(Highchart::HIGHSTOCK);

$chart->chart->renderTo = "container";
$chart->rangeSelector->selected = 1;
$chart->title->text = "AAPL Stock Price";

$chart->series[0]->name = "AAPL Stock Price";
$chart->series[0]->data = new HighchartJsExpr("data");
$chart->series[0]->type = "areaspline";
$chart->series[0]->threshold = null;
$chart->series[0]->tooltip->valueDecimals = 2;
$chart->series[0]->fillColor->linearGradient->x1 = 0;
$chart->series[0]->fillColor->linearGradient->y1 = 0;
$chart->series[0]->fillColor->linearGradient->x2 = 0;
$chart->series[0]->fillColor->linearGradient->y2 = 1;

$chart->series[0]->fillColor->stops = array(
    array(
        0,
        new HighchartJsExpr("Highcharts.getOptions().colors[0]")
    ),
    array(
        1,
        "rgba(0,0,0,0)"
    )
);