Access laravel .env variables in any other files that are not part of laravel application

<?php

// Now you can use env() or config()
// give correct path of laravel autoload.php and app.php
require __DIR__ . '/../vendor/autoload.php';
$app = require_once __DIR__ . '/../bootstrap/app.php';

use Illuminate\Contracts\Console\Kernel;

$kernel = $app->make(Kernel::class);
$kernel->bootstrap();

$servername = "localhost";
$dbname = env('DB_DATABASE');
$username = env('DB_USERNAME');
$password = env('DB_PASSWORD');