Pop\Pdf\Pdf::setPage PHP Method

    public function setPage($pg)
    {
        $key = $pg - 1;
        // Check if the page exists.
        if (!array_key_exists($key, $this->pages)) {
            throw new Exception('Error: That page does not exist.');
        }
        $this->curPage = $pg - 1;
        return $this;
    }

require_once '../../bootstrap.php';
use Pop\Color\Space\Rgb;
use Pop\Pdf\Pdf;
try {
    $pdf = new Pdf('new_test.pdf');
    $pdf->import('../assets/pdfs/hospital.pdf');
    $pdf->setFillColor(new Rgb(128, 200, 50));
    $pdf->setStrokeColor(new Rgb(0, 255, 0));
    $pdf->setStrokeWidth(8);
    $pdf->drawCircle(500, 500, 100);
    $pdf->setFillColor(new Rgb(215, 101, 12));
    $pdf->setStrokeColor(new Rgb(0, 0, 0));
    $pdf->setStrokeWidth(2, 5, 5);
    $pdf->drawRectangle(50, 150, 175, 50);
    $pdf->setPage(2);
    $pdf->setFillColor(new Rgb(12, 101, 215));
    $pdf->setStrokeColor(new Rgb(0, 0, 128));
    $pdf->setStrokeWidth(5);
    $pdf->drawRectangle(150, 650, 400, 100);
    $pdf->addFont('Courier');
    $pdf->setFillColor(new Rgb(12, 255, 12));
    $pdf->addText(10, 300, 18, 'Hello World Again!!!', 'Courier');
    $pdf->addUrl(10, 300, 380, 18, 'http://www.popphp.org/');
    $pdf->setFillColor(new Rgb(128, 200, 50));
    $pdf->setStrokeColor(new Rgb(0, 255, 0));
    $pdf->setStrokeWidth(8);
    $pdf->drawCircle(500, 500, 100);
    $pdf->addPage('Legal');
    $pdf->setFillColor(new Rgb(128, 200, 50));
    $pdf->setStrokeColor(new Rgb(0, 255, 0));