Drupal Site Settings : Using settings.php

Drupal settings file can contains variable which can use to use for different configuration in different environments.

Example:

env_name

default_info_nid

$settings['env_name'] = 'Local';

$settings['default_info_nid'] = 1';

Read the settings

use Drupal\Core\Site\Settings;

$envName = Settings::get('env_name');

$nid = Settings::get('default_info_nid');