Added docs for the missing Intl polyfills

components/polyfill_intl_grapheme.rst

@@ -50,9 +50,11 @@ Provided Functions
 
 .. seealso::
 
-    The :doc:`polyfill-intl-icu </components/polyfill_intl_icu>` and
-    :doc:`polyfill-intl-normalizer </components/polyfill_intl_normalizer>`
-    components provide polyfills for other classes and functions related to the
-    Intl PHP extension.
+    Symfony provides more polyfills for other classes and functions related to
+    the Intl PHP extension:
+    :doc:`polyfill-intl-icu </components/polyfill_intl_icu>`,
+    :doc:`polyfill-intl-idn </components/polyfill_intl_idn>`,
+    :doc:`polyfill-intl-messageformatter </components/polyfill_intl_messageformatter>`,
+    and :doc:`polyfill-intl-normalizer </components/polyfill_intl_normalizer>`.
 
 .. _`PHP intl extension`: https://secure.php.net/manual/en/book.intl.php

components/polyfill_intl_icu.rst

@@ -46,9 +46,11 @@ Provided Functions
 
 .. seealso::
 
-    The :doc:`polyfill-intl-grapheme </components/polyfill_intl_grapheme>` and
-    :doc:`polyfill-intl-normalizer </components/polyfill_intl_normalizer>`
-    components provide polyfills for other classes and functions related to the
-    Intl PHP extension.
+    Symfony provides more polyfills for other classes and functions related to
+    the Intl PHP extension:
+    :doc:`polyfill-intl-grapheme </components/polyfill_intl_grapheme>`,
+    :doc:`polyfill-intl-idn </components/polyfill_intl_idn>`,
+    :doc:`polyfill-intl-messageformatter </components/polyfill_intl_messageformatter>`,
+    and :doc:`polyfill-intl-normalizer </components/polyfill_intl_normalizer>`.
 
 .. _`PHP intl extension`: https://secure.php.net/manual/en/book.intl.php

components/polyfill_intl_idn.rst

@@ -0,0 +1,45 @@
+.. index::
+    single: Polyfill
+    single: IDN
+    single: Components; Polyfill
+
+The Symfony Polyfill / Intl IDN Component
+=========================================
+
+    This component provides a collection of functions related to IDN when the
+    Intl extension is not installed.
+
+Installation
+------------
+
+.. code-block:: terminal
+
+    $ composer require symfony/polyfill-intl-idn
+
+Alternatively, you can clone the `<https://github.com/symfony/polyfill-intl-idn>`_ repository.
+
+.. include:: /components/require_autoload.rst.inc
+
+Usage
+-----
+
+Once this component is installed in your application, you can use the following
+functions, no matter if the `PHP intl extension`_ is installed or not in your
+server.
+
+Provided Functions
+~~~~~~~~~~~~~~~~~~
+
+* :phpfunction:`idn_to_ascii`
+* :phpfunction:`idn_to_utf8`
+
+.. seealso::
+
+    Symfony provides more polyfills for other classes and functions related to
+    the Intl PHP extension:
+    :doc:`polyfill-intl-grapheme </components/polyfill_intl_grapheme>`,
+    :doc:`polyfill-intl-icu </components/polyfill_intl_icu>`,
+    :doc:`polyfill-intl-messageformatter </components/polyfill_intl_messageformatter>`,
+    and :doc:`polyfill-intl-normalizer </components/polyfill_intl_normalizer>`.
+
+.. _`PHP intl extension`: https://secure.php.net/manual/en/book.intl.php

components/polyfill_intl_messageformatter.rst

@@ -0,0 +1,50 @@
+.. index::
+    single: Polyfill
+    single: MessageFormatter
+    single: Components; Polyfill
+
+The Symfony Polyfill / Intl MessageFormatter Component
+======================================================
+
+    This component provides a fallback implementation for the ``MessageFormatter``
+    class to users who run PHP versions without the ``intl`` extension.
+
+Installation
+------------
+
+.. code-block:: terminal
+
+    $ composer require symfony/polyfill-intl-messageformatter
+
+Alternatively, you can clone the `<https://github.com/symfony/polyfill-intl-messageformatter>`_ repository.
+
+.. include:: /components/require_autoload.rst.inc
+
+Usage
+-----
+
+Once this component is installed in your application, you can use the following
+classes and functions, no matter if the `PHP intl extension`_ is installed or
+not in your server.
+
+Provided Classes
+~~~~~~~~~~~~~~~~
+
+* :phpclass:`IntlException`
+* :phpclass:`MessageFormatter`
+
+Provided Functions
+~~~~~~~~~~~~~~~~~~
+
+* :phpfunction:`msgfmt_format_message`
+
+.. seealso::
+
+    Symfony provides more polyfills for other classes and functions related to
+    the Intl PHP extension:
+    :doc:`polyfill-intl-grapheme </components/polyfill_intl_grapheme>`,
+    :doc:`polyfill-intl-idn </components/polyfill_intl_idn>`,
+    :doc:`polyfill-intl-icu </components/polyfill_intl_icu>`,
+    and :doc:`polyfill-intl-normalizer </components/polyfill_intl_normalizer>`.
+
+.. _`PHP intl extension`: https://secure.php.net/manual/en/book.intl.php

components/polyfill_intl_normalizer.rst

@@ -40,8 +40,11 @@ Provided Functions
 
 .. seealso::
 
-    The :doc:`polyfill-intl-grapheme </components/polyfill_intl_grapheme>` and
-    :doc:`polyfill-intl-icu </components/polyfill_intl_icu>` components provide
-    polyfills for other classes and functions related to the Intl PHP extension.
+    Symfony provides more polyfills for other classes and functions related to
+    the Intl PHP extension:
+    :doc:`polyfill-intl-grapheme </components/polyfill_intl_grapheme>`,
+    :doc:`polyfill-intl-idn </components/polyfill_intl_idn>`,
+    :doc:`polyfill-intl-icu </components/polyfill_intl_icu>`,
+    and :doc:`polyfill-intl-messageformatter </components/polyfill_intl_messageformatter>`.
 
 .. _`PHP intl extension`: https://secure.php.net/manual/en/book.intl.php