How can one efficiently handle the merging of large PDF documents in PHP to avoid performance issues?

Merging large PDF documents in PHP can lead to performance issues due to memory constraints. To efficiently handle this, one approach is to use a library like TCPDF or FPDI to merge the PDFs without loading them entirely into memory at once. 

// Example using TCPDF library to merge PDF documents
require_once('tcpdf/tcpdf.php');

// Create new TCPDF object
$pdf = new TCPDF();

// Add first PDF document
$pdf->setSourceFile('document1.pdf');
$tplIdx1 = $pdf->importPage(1);
$pdf->AddPage();
$pdf->useTemplate($tplIdx1, 0, 0);

// Add second PDF document
$pdf->setSourceFile('document2.pdf');
$tplIdx2 = $pdf->importPage(1);
$pdf->AddPage();
$pdf->useTemplate($tplIdx2, 0, 0);

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

Keywords

PDF merging performance PHP optimization

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