The env function retrieves the value of an environment variable or returns a default value:
<?php $env = env('APP_ENV');

$env = env('APP_ENV', 'production');
<?php     |




    'server' => env('OCTANE_SERVER', 'roadrunner'),




    |--------------------------------------------------------------------------
<?php     |




    'https' => env('OCTANE_HTTPS', false),




    |--------------------------------------------------------------------------