pds/app/Http/Controllers/ProductionOrderController.php

<?php

namespace App\Http\Controllers;

use App\Models\ProductionOrder;
use Illuminate\Http\Request;
use SimpleSoftwareIO\QrCode\Facades\QrCode;
use Barryvdh\DomPDF\Facade\Pdf;

class ProductionOrderController extends Controller
{
    /**
     * Display a listing of the resource.
     */
    public function index()
    {
        //
    }

    public function print($production_order)
    {
        $order = ProductionOrder::where('production_order', $production_order)->first();

        if (!$order) {
            abort(404, 'Production Order not found');
        }
        else{
            $fromSerial = (int) $order->from_serial_number;
            $toSerial   = (int) $order->to_serial_number;
            $itemCode = $order->item->code ?? '';
            $itemDes = $order->item->description ?? '';

            $stickers = [];

            for ($i = $fromSerial; $i <= $toSerial; $i++)
            {

                $serial = str_pad($i, 6, '0', STR_PAD_LEFT);

                $qrData = $itemCode . '|' . $serial;

                $qrBase64 = base64_encode(
                    QrCode::format('png')->size(100)->generate($qrData)
                );

                $stickers[] = [
                    'serial' => $serial,
                    'qr' => 'data:image/png;base64,' . $qrBase64,
                    'production_order' => $production_order,
                    'description' => $itemDes ?? ''
                ];
            }

            $pdf = Pdf::loadView('production-orders.print', compact('stickers'))
                ->setPaper([0, 0, 170, 40]);

            return $pdf->stream('stickers.pdf');
        }
    }

    /**
     * Store a newly created resource in storage.
     */
    public function store(Request $request)
    {
        //
    }

    /**
     * Display the specified resource.
     */
    public function show(string $id)
    {
        //
    }

    /**
     * Update the specified resource in storage.
     */
    public function update(Request $request, string $id)
    {
        //
    }

    /**
     * Remove the specified resource from storage.
     */
    public function destroy(string $id)
    {
        //
    }
}