Nestedoption

NestedOption

..versionadded::4.2

This feature was introduced in Symfony 4.2.

Suppose you want an option named ``spool`` which has two sub-options ``type``

and ``path``. Instead ofdefine it as a simple array of values, you can pass

a closure as the default value of the ``spool`` option withan:class:`Symfony\\Component\\OptionsResolver\\OptionsResolver`

and ``path``. Instead ofdefining it as a simple array of values, you can pass

a closure as the default value of the ``spool`` option witha:class:`Symfony\\Component\\OptionsResolver\\OptionsResolver`

argument. Based on this instance, you can define the options under ``spool`` and its desired default

value::

The arguments of the closure must be type hinted as ``OptionsResolver`` and ``Options`` respectively.

Otherwise, the closure itself is considered as the default value of the option.

In same way, parent options can accesstothe child option as follows::

In same way, parent options can access the child option as follows::

..note::

The fact that an option is defined as nested, means that you must to pass

an array of values to resolve iton runtime.

The fact that an option is defined as nested means that you must pass

an array of values to resolve itat runtime.

Deprecating the Option