PHP Dotenv

For using it in PHP first you have to have:

A PHP version installed.
Installed the php-dotenv package. If you have composer installed you can do it just by running composer require vlucas/phpdotenv.

For a .env file like this:

<?php
  require("vendor/autoload.php");
  $dotenv = Dotenv\Dotenv::createUnsafeImmutable(__DIR__);

  $dotenv -> load(".env");

  $DB_NAME = $_ENV['DB_NAME'];
  echo $DB_NAME . "\n";
?>