.env

Retrieve values from .env file

env('APP\_DEBUG');
// with default value
env('APP\_DEBUG', false);

Determine current environment

use Illuminate\Support\Facades\App;
$environment = App::environment();

Accessing configuration values using "dot" syntax

// config/app.php --> ['timezone' => '']
$value = config('app.timezone');
// Retrieve a default value if the configuration value does not exist...
$value = config('app.timezone', 'Asia/Seoul');

Set configuration values at runtime:

config(['app.timezone' => 'America/Chicago']);