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getEnvPlaceholders example

        $this->unusedEnvPlaceholders = [];
    }

    /** * Merges the env placeholders of another EnvPlaceholderParameterBag. * * @return void */
    public function mergeEnvPlaceholders(self $bag)
    {
        if ($newPlaceholders = $bag->getEnvPlaceholders()) {
            $this->envPlaceholders += $newPlaceholders;

            foreach ($newPlaceholders as $env => $placeholders) {
                $this->envPlaceholders[$env] += $placeholders;
            }
        }

        if ($newUnusedPlaceholders = $bag->getUnusedEnvPlaceholders()) {
            $this->unusedEnvPlaceholders += $newUnusedPlaceholders;

            foreach ($newUnusedPlaceholders as $env => $placeholders) {

if (!class_exists(BaseNode::class) || !$extensions = $container->getExtensions()) {
            return;
        }

        $resolvingBag = $container->getParameterBag();
        if (!$resolvingBag instanceof EnvPlaceholderParameterBag) {
            return;
        }

        $defaultBag = new ParameterBag($resolvingBag->all());
        $envTypes = $resolvingBag->getProvidedTypes();
        foreach ($resolvingBag->getEnvPlaceholders() + $resolvingBag->getUnusedEnvPlaceholders() as $env => $placeholders) {
            $values = [];
            if (false === $i = strpos($env, ':')) {
                $default = $defaultBag->has("env($env)") ? $defaultBag->get("env($env)") : self::TYPE_FIXTURES['string'];
                $defaultType = null !== $default ? get_debug_type($default) : 'string';
                $values[$defaultType] = $default;
            } else {
                $prefix = substr($env, 0, $i);
                foreach ($envTypes[$prefix] ?? ['string'] as $type) {
                    $values[$type] = self::TYPE_FIXTURES[$type] ?? null;
                }
            }

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()
    {

public function testOverriddenEnvsAreMerged()
    {
        $container = new ContainerBuilder();
        $container->registerExtension(new FooExtension());
        $container->prependExtensionConfig('foo', ['bar' => '%env(FOO)%']);
        $container->prependExtensionConfig('foo', ['bar' => '%env(BAR)%', 'baz' => '%env(BAZ)%']);

        $pass = new MergeExtensionConfigurationPass();
        $pass->process($container);

        $this->assertSame(['BAZ', 'FOO'], array_keys($container->getParameterBag()->getEnvPlaceholders()));
        $this->assertSame(['BAZ' => 1, 'FOO' => 0], $container->getEnvCounters());
    }

    public function testProcessedEnvsAreIncompatibleWithResolve()
    {
        $this->expectException(RuntimeException::class);
        $this->expectExceptionMessage('Using a cast in "env(int:FOO)" is incompatible with resolution at compile time in "Symfony\Component\DependencyInjection\Tests\Compiler\BarExtension". The logic in the extension should be moved to a compiler pass, or an env parameter with no cast should be used instead.');
        $container = new ContainerBuilder();
        $container->registerExtension(new BarExtension());
        $container->prependExtensionConfig('bar', []);

        (

        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;
            }

$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
    {