Build configuration arrays from config files and env vars.

@see github.com/codemix/yii2-configloader


Yii2 Configloader

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Build configuration arrays from config files and environment variables.


You can use this extension to solve some or all of the following tasks:

  • Build Yii2 configuration arrays for web and console application
  • Initialize Yii environment (YII_DEBUG, YII_ENV) from environment variables
  • Load environment variables from a .env file
  • Get config options from environment variables
  • Load local configuration overrides
  • Streamline config initialization and Yii 2 bootstrapping


Install the package with composer:

composer require codemix/yii2-configloader


We mainly use this extension to configure our dockerized yii2 applications. It's good practice to build your docker applications in such a way, that the runtime configuration in productive mode happens solely via environment variables.

But during local development we can loosen these strict requirement a little as we sometimes have to add debug options or the like that should not be part of the main configuration. Here the extension helps to override settings with local configuration files that live outside of version control.

You have several options how to use this extension:

  1. Use only the Yii environment initialization
  2. Use only the configuration loader
  3. Use both

We first show how to use the first two options "standalone" and then a third, combined way that includes all features.

1. Initializing Yii environment

This will set the YII_DEBUG and YII_ENV variables according to the respective environment variables if those are set. It can also load them from a .env file.

In debug mode error_reporting() will also be set to E_ALL.

use codemix\yii2confload\Config;

$setting = Config::env('MY_SETTING', 'default');

If you leave away the application path, no .env file will be loaded.

2. Loading configuration

If want to load your configuration with this extenstion, the following naming scheme must be followed:

  • config/web.php - Web configuration
  • config/console.php - Console configuration
  • config/local.php - Local overrides for the web configuration (optional)
  • config/local-console.php - Local overrides for the console configuration (optional)

If you only want to load configuration from files but whithout initializing the Yii environments as shown above, you'd create a Config instance and pass the application base directory and, as second argument, false to the constructor:

use codemix\yii2confload\Config;
$config = new Config('/path/to/app', false);
// Reads configuration from config/web.php
$webConfig = $config->web();

2.1 Local configuration

By default local configuration files local.php and local-console.php are not loaded. To activate this feature you can either set the ENABLE_LOCALCONF environment variable (either in your server environment or in .env):


Now any call to web() or console() will return the merged result of config/web.php + config/console.php or config/console.php + config/local-console.php respectively.

Alternatively you can explicitely ask for local configuration:

use codemix\yii2confload\Config;
$config = new Config('/path/to/app', false);
// Merges configuration from config/web.php and config/local.php if present
$webConfig = $config->web([], true);
// Merges configuration from config/console.php and config/local-console.php if present
$consoleConfig = $config->console([], true);

2.2 Merging custom configuration

You can also inject some other configuration when you fetch the web or console config:

use codemix\yii2confload\Config;
$config = new Config('/path/to/app', false);
$webConfig = $config->web(['id' => 'test'], true);

3. Initialize Yii environment and load configuration

Let's finally show a full example that demonstrates how to use all the mentioned features in one go. A typical setup will use the following files:


Here we define the Yii environment and DB credentials. You'd add more config options in the same manner:




This file is later included in the scope of codemix\yii2confload\Config, so you can easily access instance and class methods:

/* @var codemix\yii2confload\Config $this */
return [
    'components' => [
        'db' => [
            'dsn' => self::env('DB_DSN', 'mysql:host=db;dbname=web'),
            'username' => self::env('DB_USER', 'web'),
            'password' => self::env('DB_PASSWORD', 'web'),


Having access to the config instance allows for example to reuse parts of your web configuration in your console config.

/* @var codemix\yii2confload\Config $this */

$web = $this->web();
return [
    // ...
    'components' => [
        'db' => $web['components']['db'],


We've streamlined the process of setting up a Config object and loading the Yii 2 bootstrap file into a single method Config::boostrap() which only receives the application directory as argument.

use codemix\yii2confload\Config;

require(__DIR__ . '/../vendor/autoload.php');
$config = Config::bootstrap(__DIR__ . '/..');
Yii::createObject('yii\web\Application', [$config->web()])->run();

This makes sure that things are loaded in the right order. If you prefer a more verbose version, the code above is equivalent to:

use codemix\yii2confload\Config;

require(__DIR__ . '/../vendor/autoload.php');
$config = new Config(__DIR__ . '/..');
require(__DIR__ . '/../vendor/yiisoft/yii2/Yii.php');

Yii::createObject('yii\web\Application', [$config->web()])->run();


The same approach is used for the console application:

use codemix\yii2confload\Config;

require(__DIR__ . '/vendor/autoload.php');
$config = Config::bootstrap(__DIR__);
$application = Yii::createObject('yii\console\Application', [$config->console()]);