ต้องการ Genarate Barcode บนไฟล์ pdf ด้วย FPDI กับ FPDF Code128

<?php
	use setasign\Fpdi\Fpdi;
	require_once('fpdf/fpdf.php');
	require_once('fpdf/code128.php');
	require_once('fpdi/autoload.php');

	$pdf = new Fpdi();
	$pdf->AddPage();
	$pdf->setSourceFile('doc.pdf');
	$tplIdx = $pdf->importPage(2);
	$pdf->useTemplate($tplIdx);
	$pdf->SetFont('Helvetica');
	$pdf->SetTextColor(255, 0, 0);
	$pdf->SetXY(30, 30);
	$pdf->Write(0, 'This is just a simple text');

	$pdf = new PDF_Code128();
	$pdf->AddPage();
	$pdf->SetFont('Arial','',10);
	$code = 'CODE 128';
	$pdf->Code128(50,20,$code,80,20);
	$pdf->SetXY(50,45);
	$pdf->Write(5,'A set: "'.$code.'"');

	$pdf->Output();
?>