How to create and use environment variable .env yii2 - yii2

Question

I want to create a file .env:
FACEBOOK_CLIENT_ID=*****
FACEBOOK_CLIENT_SECRET=*****
and use variable for config
'facebook' => [
'class' => 'yii\authclient\clients\Facebook',
'clientId' => env('FACEBOOK_CLIENT_ID'),
'clientSecret' => env('FACEBOOK_CLIENT_SECRET'),
],

Answer 1

I have found the solution.
I use package vlucas/phpdotenv.
Thank for all

Answer 2

You can archive this by Utilizing the enviroment constants. If you are using Yii2 advanced when you initialize your application as dev or production yii sets a constant YII_ENV as either dev or production in your index.php entry script.
If you are using yii basic you can set it as per your enviroment. For example we want to define config for dev.
We will proceed and edit our /web/index.php to
defined('YII_ENV') or define('YII_ENV', 'dev');
Then in our config file we would have the following
'facebook' => [
'class' => 'dektrium\user\clients\Facebook',
'clientId' => (YII_ENV_DEV ? 'Your key when in developent' : 'Your Key if not in developement'),
'clientSecret' => (YII_ENV_DEV ? 'Your key when in developent' : 'Your Key if not in developement'),
],
Refere to this for more details on Enviroment Constants http://www.yiiframework.com/doc-2.0/guide-concept-configurations.html#environment-constants

Answer 3

There's a package for Yii2 you can use for dotenv
https://github.com/yiithings/yii2-dotenv
Install:
composer require --prefer-dist yiithings/yii2-dotenv "*"
Usage:
Create a .env in project root directory
DB_HOST="localhost"
DB_NAME="yii2basic"
DB_USER="root"
DB_PASS="YourPassword"
config/db.php
return [
'class' => 'yii\db\Connection',
'dsn' => 'mysql:host='. env('DB_HOST') .';dbname='. env('DB_NAME'),
'username' => env('DB_USER'),
'password' => env('DB_PASS'),
'charset' => 'utf8',
];

Answer 4

You could use the dotenv package offered by Symfony. https://symfony.com/doc/current/components/dotenv.html
using it in a PHP file.
use Symfony\Component\Dotenv\Dotenv;
$dotenv = new Dotenv();
$dotenv->load(__DIR__.'/.env');
// You can also load several files
$dotenv->load(__DIR__.'/.env', __DIR__.'/.env.dev');
.env file
DB_USER=root
DB_PASS=pass
accessing the variables from the .env file
$dbUser = $_ENV['DB_USER'];
// you can also use ``$_SERVER``