GlobConfiguration.php

<?php
/**
 * Slavcodev Components
 *
 * @author Veaceslav Medvedev <slavcopost@gmail.com>
 * @license http://www.opensource.org/licenses/bsd-license.php
 */

namespace app\common\base;

use IteratorAggregate;
use ArrayIterator;
use yii\base\Object;
use yii\helpers\ArrayHelper;

/**
 * Class GlobConfiguration
 *
 * Will loaded next files in given priority:
 * - `/common/config/main*.php`
 * - `/common/config/<env>*.php`
 * - `/common/config/local*.php`
 * - `/<appName>/config/main*.php`
 * - `/<appName>/config/<env>*.php`
 * - `/<appName>/config/local*.php`
 *
 * @author Veaceslav Medvedev <slavcopost@gmail.com>
 */
class GlobConfiguration extends Object implements IteratorAggregate
{
    public $basePath;
    public $applicationName;
    public $environment;

    private $config = [];

    /**
     * {@inheritdoc}
     */
    public function init()
    {
        parent::init();

        $configPath = strtr(
            '<basePath>/{common,<appName>}/config/{main,<env>,local}{.,*}.php',
            [
                '<basePath>' => rtrim($this->basePath, '/'),
                '<appName>' => $this->applicationName,
                '<env>' => $this->environment,
            ]
        );

        foreach (glob($configPath, GLOB_BRACE) as $file) {
            $this->config = ArrayHelper::merge($this->config, require($file));
        }
    }

    /**
     * Do not give access to config, it's immutabe. We use an iterator instead.
     *
     * {@inheritdoc}
     */
    public function getIterator()
    {
        return new ArrayIterator($this->config);
    }
}

index.php

<?php
/**
 * Yii Web application bootstrap file.
 *
 * @author: slavcodev <slavcopost@gmail.com>
 * @license http://www.opensource.org/licenses/bsd-license.php
 * @link https://github.com/slavcodev/
 *
 * @version: 0.4
 */

/**
 * Application ID. Defaults to folder name
 */
defined('APP_ID') or define('APP_ID', basename(dirname(__DIR__)));
/**
 * Application environment.
 */
defined('YII_ENV') or define('YII_ENV', getenv('APP_ENV') ?: 'dev');
/**
 * Debug mode enabled on given environment.
 */
defined('YII_DEBUG') or define('YII_DEBUG', in_array(YII_ENV, ['dev']));

// Setup project directories.
$rootPath = dirname(dirname(__DIR__));
chdir($rootPath);

/**
 * @var \Composer\Autoload\ClassLoader $loader Registered composer autoloader.
 */
$loader = require($rootPath . '/vendor/autoload.php');
// Register vendor namespace
$loader->addPsr4('app\\', $rootPath);

// Create application and run. Have fun!
$config = new app\common\base\GlobConfiguration([
        'basePath' => $rootPath,
        'applicationName' => APP_ID,
        'environment' => YII_ENV,
    ]);
$application = new yii\web\Application(iterator_to_array($config));
$application->run();