wp_config optimized

<?php

/* ABSOLUTE PATH */
if ( !defined( 'ABSPATH' ) ) :
  define('ABSPATH', dirname(__FILE__) . '/');
endif;

/* DB CREDS */
if ( file_exists( ABSPATH . 'wp-config.local.php' ) ) :
  require_once( 'wp-config.local.php' );
elseif ( $_SERVER['SERVER_NAME'] == "staging.domain.com" )  :
  define('DB_HOST', 'host');
  define('DB_NAME', 'db_name');
  define('DB_USER', 'user');
  define('DB_PASSWORD', 'password');
  define('WP_ENV', 'development');
elseif ( $_SERVER['SERVER_NAME'] == "domain.com" || $_SERVER['SERVER_NAME'] == "www.domain.com" )  :
  define('DB_HOST', 'host');
  define('DB_NAME', 'db_name');
  define('DB_USER', 'user');
  define('DB_PASSWORD', 'password');
  define('WP_ENV', 'production');
endif;

/* SET DEBUGGING */
if ( defined( 'WP_ENV' ) && WP_ENV == 'development' ) :
  define('WP_DEBUG', true);
  define('SCRIPT_DEBUG', true);
  define('WP_DEBUG_LOG', true);
  define('WP_DEBUG_DISPLAY', false);
  @ini_set('display_errors',0);
endif;

/* ENCODING */
define('DB_CHARSET', 'utf8');
define('DB_COLLATE', '');

/* SALT */
define('AUTH_KEY',         'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX');
define('SECURE_AUTH_KEY',  'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX');
define('LOGGED_IN_KEY',    'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX');
define('NONCE_KEY',        'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX');
define('AUTH_SALT',        'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX');
define('SECURE_AUTH_SALT', 'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX');
define('LOGGED_IN_SALT',   'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX');
define('NONCE_SALT',       'XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX');

/* IF USING CUSTOM NON CHILD THEME */
define('WP_DEFAULT_THEME', 'default-theme-folder-name');
define('CORE_UPGRADE_SKIP_NEW_BUNDLED', true);

/* SET WP API KEY */
define('WPCOM_API_KEY', 'YourKeyHere');

/* ENABLE TRASH FOR MEDIA */
define('MEDIA_TRASH', true);

/* MISC */
$table_prefix  = 'wp_';
define('WPLANG', '');
require_once(ABSPATH . 'wp-settings.php');

This is wp_config file allows for a local config that ideally would not be track via something like a .gitignore file.