laravel edit existing pdf, and add new page or content

Dependencies: 

composer require setasign/fpdf

composer require setasign/fpdi

composer require barryvdh/laravel-dompdf

Service class :

<?php

namespace App\Services;

use setasign\Fpdi\Fpdi;

use Barryvdh\DomPDF\Facade as PDF;

use Barryvdh\DomPDF\Facade\Pdf as FacadePdf;

class PdfService

{

    public function addHtmlPageToPdf($existingPdfPath, $htmlContent, $outputPdfPath)

    {

        // Load the existing PDF

        $pdf = new Fpdi();

        $pageCount = $pdf->setSourceFile($existingPdfPath);

        // Import all pages from the existing PDF

        for ($pageNo = 1; $pageNo <= $pageCount; $pageNo++) {

            $templateId = $pdf->importPage($pageNo);

            $size = $pdf->getTemplateSize($templateId);

            $pdf->AddPage($size['orientation'], [$size['width'], $size['height']]);

            $pdf->useTemplate($templateId);

        }

        // Convert HTML to PDF using DOMPDF

        $htmlPdfContent = FacadePdf::loadHTML($htmlContent)->output();

        // Create a temporary file for the new PDF page

        $tempHtmlPdfPath = tempnam(sys_get_temp_dir(), 'html_pdf_') . '.pdf';

        file_put_contents($tempHtmlPdfPath, $htmlPdfContent);

        // Add the new HTML page as the last page of the PDF

        $pdf->AddPage();

        $pdf->setSourceFile($tempHtmlPdfPath);

        $templateId = $pdf->importPage(1);

        $pdf->useTemplate($templateId);

        // Output the new PDF

        $pdf->Output($outputPdfPath, 'F');

        // Clean up the temporary file

        unlink($tempHtmlPdfPath);

    }

}

Controller : 

<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;

use Illuminate\Http\Request;

use App\Services\PdfService;

class PDFController extends Controller

{

    protected $pdfService;

    public function __construct(PdfService $pdfService)

    {

        $this->pdfService = $pdfService;

    }

    public function addCodeToPdf(Request $request)

    {

        $existingPdfPath=storage_path('app/reports/example.pdf');

        $htmlContent = '<h1>New Page Content</h1><p>This is a new page.</p>';

        $outputPdfPath = storage_path('app/reports/example.pdf'); //Overwrite existing

        $this->pdfService->addHtmlPageToPdf($existingPdfPath, $htmlContent, $outputPdfPath);

        return response()->download($outputPdfPath);

    }

}

Route : 

use App\Http\Controllers\PdfController;

Route::get('/add-html-page', [PdfController::class, 'addHtmlPage']);