How can the issue of not being able to append PDFs be resolved when using html2pdf?

Issue: The problem of not being able to append PDFs when using html2pdf can be resolved by first converting the HTML content to PDF using html2pdf, then merging the generated PDF with the existing PDF using a library like FPDI. PHP Code Snippet: 

require_once('vendor/autoload.php');

use Spipu\Html2Pdf\Html2Pdf;

// Convert HTML content to PDF using html2pdf
$html2pdf = new Html2Pdf();
$html2pdf->writeHTML('<h1>Hello, World!</h1>');
$html2pdf->output('output.pdf');

// Merge the generated PDF with an existing PDF using FPDI
require_once('vendor/setasign/fpdi/src/autoload.php');

$pdf = new FPDI();
$pdf->AddPage();
$pdf->setSourceFile('output.pdf');
$tplIdx = $pdf->importPage(1);
$pdf->useTemplate($tplIdx, 10, 10, 100);

$pdf->Output('final_output.pdf', 'F');

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