WordPress Multiple Environments configuration

wp-config.php

<?php

// Set your environment/url pairs
$environments = array(
  'local'       => 'website.local',
  'development' => 'development.website.com',
  'staging'     => 'staging.website.com',
  'production'  => 'website.com'
);

// Get the hostname
$http_host = $_SERVER['HTTP_HOST'];

// Loop through $environments to see if there’s a match
foreach($environments as $environment => $hostname) {
  if (stripos($http_host, $hostname) !== FALSE) {
    define('ENVIRONMENT', $environment);
    break;
  }
}

// Exit if ENVIRONMENT is undefined
if (!defined('ENVIRONMENT')) exit('No database configured for this host');

// Location of environment-specific configuration
$wp_db_config = 'wp-config/wp-db-' . ENVIRONMENT . '.php'; 

// Check to see if the configuration file for the environment exists
if (file_exists(__DIR__ . '/' . $wp_db_config)) {
  require_once($wp_db_config);
} else {
  // Exit if configuration file does not exist
  exit('No database configuration found for this host');
}

/* That’s all, stop editing! Happy blogging. */

/** Absolute path to the WordPress directory. */
if ( !defined('ABSPATH') )
  define('ABSPATH', dirname(__FILE__) . '/');

/** Sets up WordPress vars and included files. */
require_once(ABSPATH . 'wp-settings.php');

wp-db-local.php

<?php
// Prevent file from being accessed directly
if (!defined('ABSPATH')) exit();

define('DB_NAME',     'database_name_here');
define('DB_USER',     'username_here');
define('DB_PASSWORD', 'password_here');
define('DB_HOST',     'localhost');
define('DB_CHARSET',  'utf8');
define('DB_COLLATE',  '');

define('AUTH_KEY',         'put your unique phrase here');
define('SECURE_AUTH_KEY',  'put your unique phrase here');
define('LOGGED_IN_KEY',    'put your unique phrase here');
define('NONCE_KEY',        'put your unique phrase here');
define('AUTH_SALT',        'put your unique phrase here');
define('SECURE_AUTH_SALT', 'put your unique phrase here');
define('LOGGED_IN_SALT',   'put your unique phrase here');
define('NONCE_SALT',       'put your unique phrase here');

$table_prefix = 'wp_';

define('WPLANG',   '');
define('WP_DEBUG', true);