Class Symfony\Component\DependencyInjection\Compiler\MergeExtensionConfigurationParameterBag

`extends`	`EnvPlaceholderParameterBag`

Symfony\Component\DependencyInjection\ParameterBag\ParameterBag implements ParameterBagInterface
- Symfony\Component\DependencyInjection\ParameterBag\EnvPlaceholderParameterBag
  - Symfony\Component\DependencyInjection\Compiler\MergeExtensionConfigurationParameterBag

Methods
`public`	`__construct(parent $parameterBag)` Overrides `Symfony\Component\DependencyInjection\ParameterBag\ParameterBag::__construct()`	#
`public`	`freezeAfterProcessing(Extension $extension, ContainerBuilder $container): void`	#
`public`	`getEnvPlaceholders(): array` Returns the map of env vars used in the resolved parameter values to their placeholders. Returns the map of env vars used in the resolved parameter values to their placeholders. Returns A map of env var names to their placeholders Overrides `Symfony\Component\DependencyInjection\ParameterBag\EnvPlaceholderParameterBag::getEnvPlaceholders()`	#
`public`	`getUnusedEnvPlaceholders(): array` Overrides `Symfony\Component\DependencyInjection\ParameterBag\EnvPlaceholderParameterBag::getUnusedEnvPlaceholders()`	#

Methods inherited from Symfony\Component\DependencyInjection\ParameterBag\EnvPlaceholderParameterBag
`get(), getEnvPlaceholderUniquePrefix(), clearUnusedEnvPlaceholders(), mergeEnvPlaceholders(), setProvidedTypes(), getProvidedTypes(), resolve()`

Methods inherited from Symfony\Component\DependencyInjection\ParameterBag\ParameterBag
`clear(), add(), all(), allDeprecated(), set(), deprecate(), has(), remove(), resolveValue(), resolveString(), isResolved(), escapeValue(), unescapeValue()`

Properties
`private`	`array`	`$processedEnvPlaceholders`	#

Properties inherited from Symfony\Component\DependencyInjection\ParameterBag\EnvPlaceholderParameterBag
`$envPlaceholderUniquePrefix, $envPlaceholders, $unusedEnvPlaceholders, $providedTypes, $counter`

Properties inherited from Symfony\Component\DependencyInjection\ParameterBag\ParameterBag
`$parameters, $resolved, $deprecatedParameters`