ForRo/app/Http/Controllers/ExportController.php

<?php

namespace App\Http\Controllers;

class ExportController extends Controller
{
    //
    public function exportCSV()
    {
        /*
        $columns = [
            'id',
            'product_name',
            'product_url',
            'price',
            'category'
        ];

        $products = [
            [1, 'product 1', 'https://example.com/product-1', '9.99', 'category 1'],
            [2, 'product 2', 'https://example.com/product-2', '19.99', 'category 2'],
            [3, 'product 3', 'https://example.com/product-3', '29.99', 'category 3'],
            [4, 'product 4', 'https://example.com/product-4', '39.99', 'category 4'],
        ];

        header('Content-Type: text/csv');
        header('Content-Disposition: attachment; filename="products.csv"');

        echo implode(',', $columns) . PHP_EOL;
        foreach ($products as $product) {
            echo implode(',', $product) . PHP_EOL;
        }
        */
    }
}