How to merge two pdf in php without any external file

composer require daltcore/lara-pdf-merger$f1 = Storage::disk('s3_bucket_location')->get('f1.pdf');
$f2 = Storage::disk('s3_bucket_location')->get('f2.pdf');
$pdf = new \PDFMerger();
$pdf->addPDF($f1, 'all');
$pdf->addPDF($f2, 'all');
$pdf->merge('file', 'samplepdfs/TEST2.pdf');
$pdfMerger = PDFMerger::init();
$path = storage_path("app/f1.pdf");
$pdfMerger->addPDF($path, 'all');
$path = storage_path("app/f2.pdf");
$pdfMerger->addPDF($path, 'all');
$pdfMerger->merge();
$pdfMerger->save("merge.pdf", "I");

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