Symfony\Component\DependencyInjection\Dumper\PhpDumper::exportParameters PHP Method

    private function exportParameters(array $parameters, $path = '', $indent = 12)
    {
        $php = array();
        foreach ($parameters as $key => $value) {
            if (is_array($value)) {
                $value = $this->exportParameters($value, $path.'/'.$key, $indent + 4);
            } elseif ($value instanceof Variable) {
                throw new InvalidArgumentException(sprintf('You cannot dump a container with parameters that contain variable references. Variable "%s" found in "%s".', $value, $path.'/'.$key));
            } elseif ($value instanceof Definition) {
                throw new InvalidArgumentException(sprintf('You cannot dump a container with parameters that contain service definitions. Definition for "%s" found in "%s".', $value->getClass(), $path.'/'.$key));
            } elseif ($value instanceof Reference) {
                throw new InvalidArgumentException(sprintf('You cannot dump a container with parameters that contain references to other services (reference to service "%s" found in "%s").', $value, $path.'/'.$key));
            } elseif ($value instanceof Expression) {
                throw new InvalidArgumentException(sprintf('You cannot dump a container with parameters that contain expressions. Expression "%s" found in "%s".', $value, $path.'/'.$key));
            } else {
                $value = $this->export($value);
            }

            $php[] = sprintf('%s%s => %s,', str_repeat(' ', $indent), $this->export($key), $value);
        }

        return sprintf("array(\n%s\n%s)", implode("\n", $php), str_repeat(' ', $indent - 4));
    }