/**
  * @param TrendLines $trendLines
  * @return Plot
  */
 public function addTrendLines(TrendLines $trendLines)
 {
     $this->trendLines[] = $trendLines->getXML();
     return $this;
 }
use FusionCharts\Tag\Categories;
use FusionCharts\Tag\Category;
use FusionCharts\Tag\DataSet;
use FusionCharts\Tag\Set;
use FusionCharts\Tag\Line;
use FusionCharts\Tag\TrendLines;
// Data from db
$months = array('Jan', 'Feb', 'Mar', 'Apr');
$valLine1 = array(100, 200, 150, 210);
$valLine2 = array(50, 300, 90, 400);
$chart = new LineChart('chart-container');
$categories = new Categories();
foreach ($months as $month) {
    $categories->addCategory(new Category($month));
}
$line1 = new DataSet();
foreach ($valLine1 as $value) {
    $line1->addSet(new Set($value));
}
$line2 = new DataSet();
foreach ($valLine2 as $value) {
    $line2->addSet(new Set($value));
}
$trendLine1 = new Line();
$trendLine1->setValue(250)->setColor('FF0000')->setDisplayValue('Trendline1 Example: 250')->setValueOnRight();
$trendLine2 = clone $trendLine1;
$trendLine2->setValue(390)->setDisplayValue('Trendline2 Example: 390');
$trendLines = new TrendLines();
$trendLines->addLine($trendLine1)->addLine($trendLine2);
$chart->setName('Line Chart Example')->setWidth(800)->setHeight(400)->setAttribute('showvalues', '0')->setLabelRotate(true)->addCategories($categories)->addLine($line1)->addLine($line2)->addTrendLines($trendLines);
// render chart in the index.php