fix: replace deprecated FILTER_SANITIZE_STRING

system/Helpers/cookie_helper.php

@@ -65,7 +65,7 @@ function get_cookie($index, bool $xssClean = false)
     {
         $prefix  = isset($_COOKIE[$index]) ? '' : config(App::class)->cookiePrefix;
         $request = Services::request();
-        $filter  = $xssClean ? FILTER_SANITIZE_STRING : FILTER_DEFAULT;
+        $filter  = $xssClean ? FILTER_SANITIZE_FULL_SPECIAL_CHARS : FILTER_DEFAULT;
 
         return $request->getCookie($prefix . $index, $filter);
     }

user_guide_src/source/changelogs/index.rst

@@ -12,6 +12,7 @@ See all the changes.
 .. toctree::
     :titlesonly:
 
+    v4.1.7
     v4.1.6
     v4.1.5
     v4.1.4

user_guide_src/source/changelogs/v4.1.7.rst

@@ -0,0 +1,35 @@
+Version 4.1.7
+#############
+
+Release Date: Not Released
+
+**4.1.7 release of CodeIgniter4**
+
+.. contents::
+    :local:
+    :depth: 2
+
+BREAKING
+********
+
+- Because ``FILTER_SANITIZE_STRING`` is deprecated since PHP 8.1, ``get_cookie()`` that uses it when ``$xssClean`` is true changed the output. Now it uses ``FILTER_SANITIZE_FULL_SPECIAL_CHARS``. Note that using XSS filtering is a bad practice. It does not prevent XSS attacks perfectly. Using ``esc()`` with the correct ``$context`` in the views is recommended.
+
+Enhancements
+************
+
+none.
+
+Changes
+*******
+
+none.
+
+Deprecations
+************
+
+none.
+
+Bugs Fixed
+**********
+
+See the repo's `CHANGELOG.md <https://github.com/codeigniter4/CodeIgniter4/blob/develop/CHANGELOG.md>`_ for a complete list of bugs fixed.

user_guide_src/source/helpers/cookie_helper.rst

@@ -53,6 +53,8 @@ The following functions are available:
     the ``$cookiePrefix`` that you might've set in your
     **app/Config/App.php** file.
 
+.. warning:: Using XSS filtering is a bad practice. It does not prevent XSS attacks perfectly. Using ``esc()`` with the correct ``$context`` in the views is recommended.
+
 .. php:function:: delete_cookie($name[, $domain = ''[, $path = '/'[, $prefix = '']]])
 
     :param string $name: Cookie name

user_guide_src/source/incoming/incomingrequest.rst

@@ -399,15 +399,15 @@ The methods provided by the parent classes that are available are:
         The second optional parameter lets you run the data through the PHP's
         filters. Pass in the desired filter type as the second parameter::
 
-            $request->getVar('some_data', FILTER_SANITIZE_STRING);
+            $request->getVar('some_data', FILTER_SANITIZE_FULL_SPECIAL_CHARS);
 
         To return an array of all POST items call without any parameters.
 
         To return all POST items and pass them through the filter, set the
         first parameter to null while setting the second parameter to the filter
         you want to use::
 
-            $request->getVar(null, FILTER_SANITIZE_STRING);
+            $request->getVar(null, FILTER_SANITIZE_FULL_SPECIAL_CHARS);
             // returns all POST items with string sanitation
 
         To return an array of multiple POST parameters, pass all the required keys as an array::
@@ -417,7 +417,7 @@ The methods provided by the parent classes that are available are:
         Same rule applied here, to retrieve the parameters with filtering, set the second parameter to
         the filter type to apply::
 
-            $request->getVar(['field1', 'field2'], FILTER_SANITIZE_STRING);
+            $request->getVar(['field1', 'field2'], FILTER_SANITIZE_FULL_SPECIAL_CHARS);
 
     .. php:method:: getGet([$index = null[, $filter = null[, $flags = null]]])
 
@@ -489,7 +489,7 @@ The methods provided by the parent classes that are available are:
         This method is identical to ``getPost()`` and ``getGet()``, only it fetches cookie data::
 
             $request->getCookie('some_cookie');
-            $request->getCookie('some_cookie', FILTER_SANITIZE_STRING); // with filter
+            $request->getCookie('some_cookie', FILTER_SANITIZE_FULL_SPECIAL_CHARS); // with filter
 
         To return an array of multiple cookie values, pass all the required keys as an array::
 

user_guide_src/source/installation/upgrade_417.rst

@@ -0,0 +1,51 @@
+#############################
+Upgrading from 4.1.6 to 4.1.7
+#############################
+
+Please refer to the upgrade instructions corresponding to your installation method.
+
+- :ref:`Composer Installation App Starter Upgrading <app-starter-upgrading>`
+- :ref:`Composer Installation Adding CodeIgniter4 to an Existing Project Upgrading <adding-codeigniter4-upgrading>`
+- :ref:`Manual Installation Upgrading <installing-manual-upgrading>`
+
+.. contents::
+    :local:
+    :depth: 2
+
+Breaking Changes
+****************
+
+- ``get_cookie()`` when ``$xssClean`` is true changed the output. Now it uses ``FILTER_SANITIZE_FULL_SPECIAL_CHARS``, not ``FILTER_SANITIZE_STRING``. Make sure the change is acceptable or not. Note that using XSS filtering is a bad practice. It does not prevent XSS attacks perfectly. Using ``esc()`` with the correct ``$context`` in the views is recommended.
+
+Breaking Enhancements
+*********************
+
+none.
+
+Project Files
+*************
+
+Numerous files in the **project space** (root, app, public, writable) received updates. Due to
+these files being outside of the **system** scope they will not be changed without your intervention.
+There are some third-party CodeIgniter modules available to assist with merging changes to
+the project space: `Explore on Packagist <https://packagist.org/explore/?query=codeigniter4%20updates>`_.
+
+.. note:: Except in very rare cases for bug fixes, no changes made to files for the project space
+    will break your application. All changes noted here are optional until the next major version,
+    and any mandatory changes will be covered in the sections above.
+
+Content Changes
+===============
+
+The following files received significant changes (including deprecations or visual adjustments)
+and it is recommended that you merge the updated versions with your application:
+
+*
+
+All Changes
+===========
+
+This is a list of all files in the **project space** that received changes;
+many will be simple comments or formatting that have no effect on the runtime:
+
+*

user_guide_src/source/installation/upgrading.rst

@@ -8,6 +8,7 @@ upgrading from.
 .. toctree::
     :titlesonly:
 
+    Upgrading from 4.1.6 to 4.1.7 <upgrade_417>
     Upgrading from 4.1.5 to 4.1.6 <upgrade_416>
     Upgrading from 4.1.4 to 4.1.5 <upgrade_415>
     Upgrading from 4.1.3 to 4.1.4 <upgrade_414>