Phalcon PHP Framework environment switching

Application.php

<?php
//...
protected function _setEnvironment($config)
    {
        $env = new \stdClass();
        if (array_key_exists('ENV', $_SERVER) && isset($_SERVER['ENV'])) {
            $env->name = $_SERVER['ENV'];
        } else {
            $env->host = $_SERVER['HTTP_HOST'];
            foreach ($config['domains'] as $k => $v) {
                if (property_exists($v, $env->host)) {
                    $env->name = $k;
                }
            }
        }

        if (!property_exists($env, 'name')) {
            $env->name = 'local';
        }
        $this->di->set('env', $env);
    }
    
protected function _registerServices()
  {
    //...
    $config = include __DIR__ . '/../../../config/config.php';
    $this->_setEnvironment($config);
    $envConfig = include __DIR__ . '/../../../config/' . $this->di->get('env')->name . '/config.php';
    $config->merge($envConfig);
    $this->di->set('config', $config);
    //...
  }

config.php

<?php

/**
 * Simple application configuration
 */
return new \Phalcon\Config([

    'databases' => [
        'default' => 'master',

        'master' => [
            'adapter' => 'Mysql',
            'host' => 'localhost',
            'username' => 'root',
            'password' => 'root',
            'dbname' => 'phalcon',
            'persistent' => true,
            'charset' => 'utf8'
        ],

        'postgres' => [
            'adapter' => 'Postgresql',
            'host' => 'localhost',
            'username' => 'root',
            'password' => 'root',
            'dbname' => 'phalcon',
            'persistent' => true,
            'charset' => 'utf8'
        ],
    ],
    'domains' => [
        'local' => [
            'phalcon.local',
            'phalcon.local:8000',
            'localhost'
        ],
        'dev' => [
            'api.dev'
        ],
        'qa' => [
            'api.qa'
        ],
        'uat' => [
            'api.uat'
        ],
        'prod' => [
            'realsite.com'
        ]
    ],
    'application' => [
        'baseUri' => '/',
        'annotations' => ['adapter' => 'Memory'],
        'models' => [
            'metadata' => ['adapter' => 'Memory']
        ]
    ]
]);