Basic usage

use Concat\Config\Container\AbstractContainer;

class Configuration extends AbstractContainer
{
    /**
     * Returns an associative array of expected types, with names mapped to
     * either a single type or an array of accepted types. These types can be
     * \Concat\Config\Container\Value constants or class names. You can also
     * specify `null` as an expected type, which allows null evaluations.
     */
    protected function getExpectedTypes()
    {
        return [

            // Amount of time before an HTTP request times out
            "timeout" => Value::TYPE_INTEGER,

            "logging" => [

                // PSR-3 logger implementation
                "logger" => "Psr\Log\LoggerInterface",

                // Log level to use for the logger
                "logLevel" => Value::TYPE_STRING,
            ],
        ];
    }

    /**
     * Returns an associative array of optional default values, with names
     * mapped to a single value. This value can also be a class name, which will
     * be evaluated when first requested. You can also specify callables which
     * will evaluate to their result when the value is requested, however this
     * does not work if a callable is also an acceptable value type.
     */
    protected function getDefaultValues()
    {
        return [

            // Amount of time before an HTTP request times out
            "timeout" => 10,

            "logging" => [

                // Log level to use for the logger
                "logLevel" => "debug",
            ],
        ];
    }
}

$container = Configuration::make([
    "logging" => [
        "logger" => function () {
            // Create instance of logger here, or set it directly
            // without using a Closure.
        }
    ],
]);

// This is now a constructed logger instance.
$logger = $container->get('logging', 'logger');

// 10
$timeout = $container->get('timeout');