Regarding how Joomla loads configuration.php in index.php, at line 29
if (file_exists(__DIR__ . '/defines.php'))
{
include_once __DIR__ . '/defines.php';
}
if (!defined('_JDEFINES'))
{
define('JPATH_BASE', __DIR__);
require_once JPATH_BASE . '/includes/defines.php';
}
You can put a custom defines.php in the Joomla root directory, then customize the 'JPATH_CONFIGURATION' value, something like this:
<?php
/**
* @package Joomla.Site
*
* @copyright Copyright (C) 2005 - 2016 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
defined('_JEXEC') or die;
define('_JDEFINES', 1);
define('JPATH_BASE', dirname(__FILE__));
$branch = $_REQUEST["branch"];
// Global definitions
$parts = explode(DIRECTORY_SEPARATOR, JPATH_BASE);
// Defines.
define('JPATH_ROOT', implode(DIRECTORY_SEPARATOR, $parts));
define('JPATH_SITE', JPATH_ROOT);
define('JPATH_CONFIGURATION', JPATH_ROOT . DIRECTORY_SEPARATOR .'configurations' . DIRECTORY_SEPARATOR .$branch);
define('JPATH_ADMINISTRATOR', JPATH_ROOT . DIRECTORY_SEPARATOR . 'administrator');
define('JPATH_LIBRARIES', JPATH_ROOT . DIRECTORY_SEPARATOR . 'libraries');
define('JPATH_PLUGINS', JPATH_ROOT . DIRECTORY_SEPARATOR . 'plugins');
define('JPATH_INSTALLATION', JPATH_ROOT . DIRECTORY_SEPARATOR . 'installation');
define('JPATH_THEMES', JPATH_BASE . DIRECTORY_SEPARATOR . 'templates');
define('JPATH_CACHE', JPATH_BASE . DIRECTORY_SEPARATOR . 'cache');
define('JPATH_MANIFESTS', JPATH_ADMINISTRATOR . DIRECTORY_SEPARATOR . 'manifests');
Creating
- configurations/development/configuration.php
- configurations/staging/configuration.php
- configurations/production/configuration.php
UPDATE
For the administrator, you must create another defines.php in the /administrator directory.
<?php
/**
* @package Joomla.Administrator
*
* @copyright Copyright (C) 2005 - 2016 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
defined('_JEXEC') or die;
define('_JDEFINES', 1);
define('JPATH_BASE', dirname(__FILE__));
$branch = $_REQUEST["branch"];
// Global definitions
$parts = explode(DIRECTORY_SEPARATOR, JPATH_BASE);
array_pop($parts);
// Defines
define('JPATH_ROOT', implode(DIRECTORY_SEPARATOR, $parts));
define('JPATH_SITE', JPATH_ROOT);
define('JPATH_CONFIGURATION', JPATH_ROOT . DIRECTORY_SEPARATOR .'configurations' . DIRECTORY_SEPARATOR .$branch);
define('JPATH_ADMINISTRATOR', JPATH_ROOT . DIRECTORY_SEPARATOR . 'administrator');
define('JPATH_LIBRARIES', JPATH_ROOT . DIRECTORY_SEPARATOR . 'libraries');
define('JPATH_PLUGINS', JPATH_ROOT . DIRECTORY_SEPARATOR . 'plugins');
define('JPATH_INSTALLATION', JPATH_ROOT . DIRECTORY_SEPARATOR . 'installation');
define('JPATH_THEMES', JPATH_BASE . DIRECTORY_SEPARATOR . 'templates');
define('JPATH_CACHE', JPATH_BASE . DIRECTORY_SEPARATOR . 'cache');
define('JPATH_MANIFESTS', JPATH_ADMINISTRATOR . DIRECTORY_SEPARATOR . 'manifests');
define('_JDEFINES', 1); line prevents Joomla loads core includes/defines.php file.
$branch can be defined regarding $_REQUEST, catching subdomain or whatever you want.
