$chart = new Highchart(Highchart::HIGHSTOCK);
$chart->includeExtraScripts();

$chart->chart->type = 'areasplinerange';
$chart->rangeSelector->selected = 2;
$chart->title->text = "Temperature variation by day";
$chart->tooltip->valueSuffix = 'ºC';
$chart->series[] = array(
    'name' => 'Temperatures',
    'data' => new HighchartJsExpr('data')
);