feature #4517 [Reference] document configurable PropertyAccessor arguments (xabbuh)

This PR was merged into the 2.6 branch.

Discussion
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[Reference] document configurable PropertyAccessor arguments

| Q             | A
| ------------- | ---
| Doc fix?      | no
| New docs?     | yes (symfony/symfony#11731)
| Applies to    | 2.6+
| Fixed tickets | #4192

Commits
-------

828ba4d document configurable PropertyAccessor arguments

Author: weaverryan

components/property_access/introduction.rst

@@ -175,6 +175,8 @@ The ``getValue`` method can also use the magic ``__get`` method::
 
     echo $accessor->getValue($person, 'Wouter'); // array(...)
 
+.. _components-property-access-magic-call:
+
 Magic ``__call()`` Method
 ~~~~~~~~~~~~~~~~~~~~~~~~~
 

reference/configuration/framework.rst

@@ -52,6 +52,9 @@ Configuration
     * :ref:`enabled <translator.enabled>`
     * `fallback`_
     * `logging`_
+* `property_accessor`_
+    * `magic_call`_
+    * `throw_exception_on_invalid_index`_
 
 secret
 ~~~~~~
@@ -535,6 +538,26 @@ for a given key. The logs are made to the ``translation`` channel and at the
 ``debug`` for level for keys where there is a translation in the fallback
 locale and the ``warning`` level if there is no translation to use at all.
 
+property_accessor
+~~~~~~~~~~~~~~~~~
+
+magic_call
+..........
+
+**type**: ``boolean`` **default**: ``false``
+
+When enabled, the ``property_accessor`` service uses PHP's
+:ref:`magic __call() method <components-property-access-magic-call>` when
+its ``getValue()`` method is called.
+
+throw_exception_on_invalid_index
+................................
+
+**type**: ``boolean`` **default**: ``false``
+
+When enabled, the ``property_accessor`` service throws an exception when you
+try to access an invalid index of an array.
+
 Full default Configuration
 --------------------------