Generador de Factura AFIP en PDF

pdf_generator.php

<?php
require_once(dirname(__FILE__) . '/library/TCPDF-main/tcpdf.php');
require_once(dirname(__FILE__) . '/library/FPDI-master/src/autoload.php');

use setasign\Fpdi;

class Pdf extends Fpdi\Tcpdf\Fpdi
{
    protected $tplId;
    private $source_file;

    public function __construct($source_file)
    {
        parent::__construct();
        $this->source_file = $source_file;
    }

    function Header()
    {
        if ($this->tplId === null) {
            $this->setSourceFile($this->source_file);
            $this->tplId = $this->importPage(1);
        }
        $size = $this->useImportedPage($this->tplId, ['adjustPageSize' => true]);

    }

    function Footer()
    {
        // emtpy method body
    }
}

$pdf = new Pdf(PATH_TEMPLATE_PDF);
$pdf->setPageUnit('pt');
$pdf->SetMargins(-10, 40, 0);
$pdf->SetAutoPageBreak(true, 40);

$pdf->AddPage();

/* puedes llamar éstos dos métodos todas las veces que necesites */
$pdf->SetXY(COORDENADA_X, COORDENADA_Y);
$pdf->writeHTML('Texto que quieres incluir');

$pdf->Output(PATH_PDF_OUTPUT, 'F');