Add compatibility layer for array_column(), array_replace(), array_replace_recursive()

2 files changed, 58 insertions, 2 deletions

diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index 9ec4d0d77..ccbb950af 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -508,7 +508,13 @@ Release Date: Not Released
       -  Changed method ``clean_string()`` to utilize ``mb_convert_encoding()`` if it is available but ``iconv()`` is not.
       -  Renamed method ``_is_ascii()`` to ``is_ascii()`` and made it public.
 
-   -  Added `compatibility layers <general/compatibility_functions>` for PHP's `mbstring <http://php.net/mbstring>`_ (limited support), `hash <http://php.net/hash>`_ and `password <http://php.net/password>`_ extensions.
+   -  Added `compatibility layers <general/compatibility_functions>` for:
+
+      - `Multibyte String <http://php.net/mbstring>`_ (limited support).
+      - `Hash <http://php.net/hash>`_ (just ``hash_pbkdf2()``).
+      - `Password Hashing <http://php.net/password>`_.
+      - `Array Functions <http://php.net/book.array>`_ (``array_column()``, ``array_replace()``, ``array_replace_recursive()``).
+
    -  Removed ``CI_CORE`` boolean constant from *CodeIgniter.php* (no longer Reactor and Core versions).
    -  Log Library will now try to create the **log_path** directory if it doesn't exist.
    -  Added support for HTTP-Only cookies with new config option *cookie_httponly* (default FALSE).
diff --git a/user_guide_src/source/general/compatibility_functions.rst b/user_guide_src/source/general/compatibility_functions.rst
index 3495101ac..398403eda 100644
--- a/user_guide_src/source/general/compatibility_functions.rst
+++ b/user_guide_src/source/general/compatibility_functions.rst
@@ -183,4 +183,54 @@ Function reference
 	:rtype:	string
 
 	For more information, please refer to the `PHP manual for
-	mb_substr() <http://php.net/mb_substr>`_.
\ No newline at end of file
+	mb_substr() <http://php.net/mb_substr>`_.
+
+***************
+Array Functions
+***************
+
+This set of compatibility functions offers support for a few
+standard `Array Functions <http://php.net/book.array>`_ in PHP
+that otherwise require a newer PHP version.
+
+Dependancies
+============
+
+- None
+
+Function reference
+==================
+
+.. function:: array_column(array $array, $column_key[, $index_key = NULL])
+
+	:param	array	$array: Array to fetch results from
+	:param	mixed	$column_key: Key of the column to return values from
+	:param	mixed	$index_key: Key to use for the returned values
+	:returns:	An array of values representing a single column from the input array
+	:rtype:	array
+
+	For more information, please refer to the `PHP manual for
+	array_column() <http://php.net/array_column>`_.
+
+.. function:: array_replace(array $array1[, ...])
+
+	:param	array	$array1: Array in which to replace elements
+	:param	array	...: Array (or multiple ones) from which to extract elements
+	:returns:	Modified array
+	:rtype:	array
+
+	For more information, please refer to the `PHP manual for
+	array_replace() <http://php.net/array_replace>`_.
+
+.. function:: array_replace_recursive(array $array1[, ...])
+
+	:param	array	$array1: Array in which to replace elements
+	:param	array	...: Array (or multiple ones) from which to extract elements
+	:returns:	Modified array
+	:rtype:	array
+
+	For more information, please refer to the `PHP manual for
+	array_replace_recursive() <http://php.net/array_replace_recursive>`_.
+
+	.. important:: Only PHP's native function can detect endless recursion.
+		Unless you are running PHP 5.3+, be careful with references!
\ No newline at end of file