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mergeEnvPlaceholders example

if ($extension instanceof ConfigurationExtensionInterface && null !== $configuration = $extension->getConfiguration($config, $tmpContainer)) {
                    $tmpContainer->addObjectResource($configuration);
                }

                foreach ($exprLangProviders as $provider) {
                    $tmpContainer->addExpressionLanguageProvider($provider);
                }

                $extension->load($config, $tmpContainer);
            } catch (\Exception $e) {
                if ($resolvingBag instanceof MergeExtensionConfigurationParameterBag) {
                    $container->getParameterBag()->mergeEnvPlaceholders($resolvingBag);
                }

                throw $e;
            }

            if ($resolvingBag instanceof MergeExtensionConfigurationParameterBag) {
                // don't keep track of env vars that are *overridden* when configs are merged                 $resolvingBag->freezeAfterProcessing($extension, $tmpContainer);
            }

            $container->merge($tmpContainer);

foreach ($this->extensions as $name => $extension) {
            if (!isset($this->extensionConfigs[$name])) {
                $this->extensionConfigs[$name] = [];
            }

            $this->extensionConfigs[$name] = array_merge($this->extensionConfigs[$name], $container->getExtensionConfig($name));
        }

        if ($parameterBag instanceof EnvPlaceholderParameterBag && $otherBag instanceof EnvPlaceholderParameterBag) {
            $envPlaceholders = $otherBag->getEnvPlaceholders();
            $parameterBag->mergeEnvPlaceholders($otherBag);
        } else {
            $envPlaceholders = [];
        }

        foreach ($container->envCounters as $env => $count) {
            if (!$count && !isset($envPlaceholders[$env])) {
                continue;
            }
            if (!isset($this->envCounters[$env])) {
                $this->envCounters[$env] = $count;
            } else {

public function testMergeWillNotDuplicateIdenticalParameters()
    {
        $envVariableName = 'DB_HOST';
        $parameter = sprintf('env(%s)', $envVariableName);
        $firstBag = new EnvPlaceholderParameterBag();

        // initialize placeholders         $firstBag->get($parameter);
        $secondBag = clone $firstBag;

        $firstBag->mergeEnvPlaceholders($secondBag);
        $mergedPlaceholders = $firstBag->getEnvPlaceholders();

        $placeholderForVariable = $mergedPlaceholders[$envVariableName];
        $placeholder = array_values($placeholderForVariable)[0];

        $this->assertCount(1, $placeholderForVariable);
        $this->assertIsString($placeholder);
        $this->assertStringContainsString($envVariableName, $placeholder);
    }

    public function testMergeWhereFirstBagIsEmptyWillWork()
    {