What are some common approaches to merging multiple PDFs into one using PHP?

Merging multiple PDFs into one using PHP can be achieved by utilizing libraries such as TCPDF or FPDI. These libraries allow you to open multiple PDF files, extract their pages, and then merge them into a single PDF document. 

require_once('tcpdf/tcpdf.php');

// Create new PDF instance
$pdf = new TCPDF();

// Add first PDF file
$pdf->setSourceFile('file1.pdf');
$tplIdx1 = $pdf->importPage(1);
$pdf->AddPage();
$pdf->useTemplate($tplIdx1, 10, 10, 200);

// Add second PDF file
$pdf->setSourceFile('file2.pdf');
$tplIdx2 = $pdf->importPage(1);
$pdf->AddPage();
$pdf->useTemplate($tplIdx2, 10, 10, 200);

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

Keywords

PDF merging PHP libraries functions

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