private static function includeConfigurationFile()
    {
        static $included = false;

        if ($included) {
            // The configuration file already included
            return;
        }

        $file = __DIR__.'/config.php';

        if (!file_exists($file)) {
            print sprintf(
                'The configuration file "%s" was not found.%sPlease copy %s/config.php.dist to %s/config.php and modify new file for set own parameters.%s',
                $file,
                PHP_EOL,
                __DIR__,
                __DIR__,
                PHP_EOL
            );

            exit(1);
        }

        $included = true;
        include_once $file;
    }