Environment based configuration for PhalconPHP (Production/Development/Staging)

application.php

<?php
// your main aplication config file
// app/config/application.php
$config = [
    'application' => [
        'cacheDir'   => __DIR__ . '/../../cache/',
        'appDir'     => __DIR__ . '/../',
        'baseUri'    => '/',
        'basePath'   => '/',
        'publicUrl'  => 'http://www.your_domain.com',
        'cryptSalt'  => '$9diko$.f#11',
    ],
    'database' => [
        'adapter'  => 'Mysql',
        'host'     => 'localhost',
        'username' => 'prod_db_user',
        'password' => 'prod_db_pass',
        'name'     => 'prod_db_name',
        'charset'  => 'utf8',
    ],
    'redis' => [
        'scheme' => 'tcp',
        'host'   => '127.0.0.1',
        'port'   => 6379
    ],
    'view'     => [
        'layoutsDir'    => '/../../../layouts/',
        'partialsDir'   => '/../../../partials/',
        'viewsDir'      => '/../../../views/',
        'defaultLayout' => 'main',
    ],
    'mail' => [
        'fromName'  => 'Your App Postmaster',
        'fromEmail' => 'noreply@prod_domain.com',
        'smtp' => [
            'server'   => 'smtp.mandrillapp.com',
            'port'     => 587,
            'security' => 'tls',
            'username' => 'USERNAME',
            'password' => 'PASSWORD',
        ],
        'mandrill_api_key' => 'YOUR_MANDRILL_API_KEY',
        'amazon' => [
            'AWSAccessKeyId' => "AMAZONE_KEY",
            'AWSSecretKey'   => "AMAZON_SECRET"
        ],
    ],
    'oAuth'  => [
        "GitHub"    => [
            'key'       => 'KEY',
            'secret'    => 'SECRET',
        ],
        "google"    => [
            'key'       => 'KEY',
            'secret'    => 'SECRET',
        ]
    ]
];

function array_merge_recursive_replace()
{
    $arrays = func_get_args();
    $base = array_shift($arrays);

    foreach ($arrays as $array) {
        reset($base);
        while (list($key, $value) = @each($array)) {
            if (is_array($value) && @is_array($base[$key])) {
                $base[$key] = array_merge_recursive_replace($base[$key], $value);
            } else {
                $base[$key] = $value;
            }
        }
    }

    return $base;
}
// override production config by enviroment config
$config = file_exists(dirname(__FILE__). DIRECTORY_SEPARATOR . APPLICATION_ENV .'.php')
    ? array_merge_recursive_replace($config, require(APPLICATION_ENV .'.php'))
    : $config;

return new \Phalcon\Config($config);

development.php

<?php
// Override production configs for development environment
// app/config/development.php
return [
    'application' => [
        'publicUrl'	 => '',
    ],
    'database' => [
        'host'     => 'localhost',
        'username' => 'dev_db_user',
        'password' => 'dev_db_pass',
        'name'     => 'dev_db_name',
    ],
];

index.php

<?php
// public/index.php

defined('APPLICATION_ENV') ||
    define('APPLICATION_ENV', (getenv('APPLICATION_ENV') ? getenv('APPLICATION_ENV') : 'production'));

// ADD "SetEnv APPLICATION_ENV development" to your Apache virtualhost
//Or
// ADD "fastcgi_param   APPLICATION_ENV  production;" to your nginx virtualhost

staging.php

<?php
// Override production configs for staging environment
// app/config/staging.php
return [
    'application' => [
        'publicUrl'	 => '',
    ],
    'database' => [
        'host'     => 'localhost',
        'username' => 'stg_db_user',
        'password' => 'stg_db_pass',
        'name'     => 'stg_db_name',
    ],
];

Hi Aboozar,
I like your example, however I think that there's a better way of merging multiple different configurations already built in \Phalcon\Config - have a look at Merging Configurations.

Here is one example that I'm often using:

$di->set('config', function(){
    /** @var \Phalcon\Config $mainConfig */
    $mainConfig = require CONFIG_DIR.'/config.php';

    /** @var \Phalcon\Config $envConfig */
    $envConfig = require CONFIG_DIR.'/environment/'.APP_ENVIRONMENT.'.php';

    $mainConfig->merge($envConfig);
    return $mainConfig;
});

And all configuration will return \Phalcon\Config instead of array

<?php
return new \Phalcon\Config(array(
    ...
));

My apologies if this functionality was not available back then