getPrototypeChildren example

    public function dumpAtPath(ConfigurationInterface $configuration, string $path)
    {
        $rootNode = $node = $configuration->getConfigTreeBuilder()->buildTree();

        foreach (explode('.', $path) as $step) {
            if (!$node instanceof ArrayNode) {
                throw new \UnexpectedValueException(sprintf('Unable to find node at path "%s.%s".', $rootNode->getName(), $path));
            }

            /** @var NodeInterface[] $children */
            $children = $node instanceof PrototypedArrayNode ? $this->getPrototypeChildren($node) : $node->getChildren();

            foreach ($children as $child) {
                if ($child->getName() === $step) {
                    $node = $child;

                    continue 2;
                }
            }

            throw new \UnexpectedValueException(sprintf('Unable to find node at path "%s.%s".', $rootNode->getName(), $path));
        }