class MergeExtensionConfigurationParameterBag

class MergeExtensionConfigurationParameterBag extends EnvPlaceholderParameterBag {
    private array $processedEnvPlaceholders;
    public function __construct(parent $parameterBag) {
        parent::__construct($parameterBag->all());
        $this->mergeEnvPlaceholders($parameterBag);
    }
    public function freezeAfterProcessing(Extension $extension, ContainerBuilder $container) : void {
        if (!($config = $extension->getProcessedConfigs())) {
            // Extension::processConfiguration() wasn't called, we cannot know how configs were merged
            return;
        }
        $this->processedEnvPlaceholders = [];
        // serialize config and container to catch env vars nested in object graphs
        $config = serialize($config) . serialize($container->getDefinitions()) . serialize($container->getAliases()) . serialize($container->getParameterBag()
            ->all());
        if (false === stripos($config, 'env_')) {
            return;
        }
        preg_match_all('/env_[a-f0-9]{16}_\\w+_[a-f0-9]{32}/Ui', $config, $matches);
        $usedPlaceholders = array_flip($matches[0]);
        foreach (parent::getEnvPlaceholders() as $env => $placeholders) {
            foreach ($placeholders as $placeholder) {
                if (isset($usedPlaceholders[$placeholder])) {
                    $this->processedEnvPlaceholders[$env] = $placeholders;
                    break;
                }
            }
        }
    }
    public function getEnvPlaceholders() : array {
        return $this->processedEnvPlaceholders ?? parent::getEnvPlaceholders();
    }
    public function getUnusedEnvPlaceholders() : array {
        return !isset($this->processedEnvPlaceholders) ? [] : array_diff_key(parent::getEnvPlaceholders(), $this->processedEnvPlaceholders);
    }

}