Example of a Config class

Config.php

<?php

namespace Survey;

/**
 * Helper to get configuration values.
 */
class Config
{
    /**
     * @var array
     */
    private static $configArray;

    /**
     * Returns the entire configuration array for the App.
     *
     * @return mixed[]
     */
    public static function getArray()
    {
        if (!is_array(static::$configArray)) {
            static::$configArray = array_merge(require 'config/config.default.php', require('config/config.php'));
        }
        return static::$configArray;
    }
}