使用PHP从模板创建新的PDF

<?php
require_once('vendor/autoload.php');

use setasign\Fpdi\Fpdi;
use setasign\Fpdf\Fpdf;

class PDF extends Fpdi
{
    protected $_tplId;

    public function Header()
    {
        if (null === $this->_tplId) {
            $this->setSourceFile('template.pdf');
            $this->_tplId = $this->importPage(1);
        }
        $this->useTemplate($this->_tplId, 0, 0, 0, 0, true);
    }
}

$pdf = new PDF();
$pageCount = $pdf->setSourceFile('template.pdf');
$pdf->AddPage();

for ($pageNo = 1; $pageNo <= $pageCount; $pageNo++) {
    $pdf->useTemplate($pdf->importPage($pageNo), 0, 0, 0, 0, true);
    if ($pageNo < $pageCount) {
        $pdf->AddPage();
    }
}

$pdf->SetFont('Helvetica', '', 12);
$pdf->SetXY(50, 50);
$pdf->Write(0, 'Hello World');

$pdf->Output('I', 'document.pdf');
?>