What are some best practices for positioning and arranging PDFs within a merged document using PHP?

When merging multiple PDFs into a single document using PHP, it's important to ensure that the positioning and arrangement of the individual PDFs are maintained. One way to achieve this is by using a library like TCPDF or FPDF, which allow you to specify the coordinates and dimensions of each PDF within the merged document. By setting the x and y coordinates for each PDF, you can control where it appears on the page and how it is positioned relative to other PDFs.

// Example code using TCPDF to merge and position PDFs within a document

require_once('tcpdf/tcpdf.php');

$pdf = new TCPDF();

// Add first PDF
$pdf->AddPage();
$pdf->setSourceFile('pdf1.pdf');
$tplIdx = $pdf->importPage(1);
$pdf->useTemplate($tplIdx, 10, 10, 100);

// Add second PDF
$pdf->AddPage();
$pdf->setSourceFile('pdf2.pdf');
$tplIdx = $pdf->importPage(1);
$pdf->useTemplate($tplIdx, 10, 120, 100);

// Output merged PDF
$pdf->Output('merged.pdf', 'D');