New normalizers

components/serializer.rst

@@ -511,6 +511,32 @@ There are several types of normalizers available:
 
     Objects are normalized to a map of property names to property values.
 
+:class:`Symfony\\Component\\Serializer\\Normalizer\\JsonSerializableNormalizer`
+    This normalizer works with classes that implement :phpclass:`JsonSerializable`.
+
+    It will call the :phpmethod:`JsonSerializable::jsonSerialize` method and
+    then further normalize the result. This means that nested
+    :phpclass:`JsonSerializable` classes will also be normalized.
+
+    This normalizer is particularly helpful when you want to gradually migrate
+    from an existing codebase using simple :phpfunction:`json_encode` to the Symfony
+    Serializer by allowing you to mix which normalizers are used for which classes.
+
+    Unlike with :phpfunction:`json_encode` circular references can be handled.
+
+:class:`Symfony\\Component\\Serializer\\Normalizer\\DateTimeNormalizer`
+    This normalizer converts :phpclass:`DateTimeInterface` objects (e.g.
+    :phpclass:`DateTime` and :phpclass:`DateTimeImmutable`) into strings.
+    By default it uses the RFC3339_ format.
+
+:class:`Symfony\\Component\\Serializer\\Normalizer\\DataUriNormalizer`
+    This normalizer converts :phpclass:`SplFileInfo` objects into a data URI
+    string (``data:...``) such that files can be embedded into serialized data.
+
+.. versionadded:: 3.1
+    The ``JsonSerializableNormalizer``, ``DateTimeNormalizer`` and
+    ``DataUriNormalizer`` normalizers were added in Symfony 3.1
+
 Handling Circular References
 ----------------------------
 
@@ -653,3 +679,4 @@ you indicate that you're expecting an array instead of a single object.
 
 .. _`JMS serializer`: https://github.com/schmittjoh/serializer
 .. _Packagist: https://packagist.org/packages/symfony/serializer
+.. _RFC3339: https://tools.ietf.org/html/rfc3339#section-5.8