#PDFMerger for PHP (PHP 5/Laravel Compatible)
Original written by http://pdfmerger.codeplex.com/team/view port to PHP 5 by https://github.com/myokyawhtun/PDFMerger I've forked it from https://github.com/rguedes/PDFMerger to update FPDF version and have support of php 7.4+
Laravel compatibility tested on v8. Sample file adapted for Laravel
$pdf = new \PDFMerger;
$pdf->addPDF('samplepdfs/one.pdf', '1, 3, 4');
$pdf->addPDF('samplepdfs/two.pdf', '1-2');
$pdf->addPDF('samplepdfs/three.pdf', 'all');
$pdf->merge('file', 'samplepdfs/TEST2.pdf');
// REPLACE 'file' WITH 'browser', 'download', 'string', or 'file' for output options
use \PDFMerger;
$pdf = new PDFMerger();
$pdf->addPDF(storage_path('app/public/' . 'samplepdfs/one.pdf'), '1, 3, 4')
->addPDF(storage_path('app/public/' . 'samplepdfs/two.pdf'), '1-2')
->addPDF(storage_path('app/public/' . 'samplepdfs/three.pdf'), 'all')
->merge('file', storage_path("app/public/merged_pdf.pdf"));