Added note on YAML mappings as objects

Author: dantleech

Diff for: components/yaml/introduction.rst

@@ -148,6 +148,16 @@ error if something goes wrong by adding the filename to the message.
 
 .. _components-yaml-dump:
 
+Objects for Mappings
+....................
+
+Yaml mappings_ are basically associative arrays. You can instruct the parser to return
+mappings as objects (i.e. ``\stdClass`` instances)::
+
+    $object = $parser->parse('{"hello": "world"}', false, false, true);
+    echo get_class($object); // stdClass
+    echo $object->hello; // world
+
 Writing YAML Files
 ~~~~~~~~~~~~~~~~~~
 
@@ -219,6 +229,9 @@ representation to the inline one:
         foo: bar
         bar: baz
 
+
+
 .. _YAML: http://yaml.org/
 .. _Packagist: https://packagist.org/packages/symfony/yaml
 .. _`YAML 1.2 version specification`: http://yaml.org/spec/1.2/spec.html
+.. _mappings: http://symfony.com/doc/current/components/yaml/yaml_format.html#collections