Add cs-fixer for PHP 8.4

Author: rcarvello

.php-cs-fixer.php

@@ -0,0 +1,23 @@
+<?php
+declare(strict_types=1);
+
+$finder = PhpCsFixer\Finder::create()
+    ->in([
+        __DIR__ . '/framework',
+        __DIR__ . '/controllers',
+        __DIR__ . '/models',
+        __DIR__ . '/views',
+        __DIR__ . '/util',
+        __DIR__ . '/classes',
+    ])
+    ->name('*.php');
+
+return (new PhpCsFixer\Config())
+    ->setFinder($finder)
+    ->setRules([
+        'nullable_type_declaration_for_default_null_value' => true,
+    ]);
+
+foreach ($finder as $file) {
+    echo $file->getRealPath() . PHP_EOL;
+}

cs-fixer.md

@@ -0,0 +1,45 @@
+## Upgrade PHP Web MVC Framework to PHP >= 8.4
+
+You can fix/upgrade PHP WEB MVC Framework to PHP 8.4 by eliminating the:
+
+**nullable_type_declaration_for_default_null_value**
+
+used for backward compatibility with versions from PHP 7.1 to PHP 5.6.
+
+To apply the fix if your runtime PHP enviroment is version is >= 7.1 run:
+
+1)
+
+  ```bash
+composer require --dev friendsofphp/php-cs-fixer
+  ```
+
+2) If you are using PHP version 8.4 you must set the environment variable:
+
+   **PHP_CS_FIXER_IGNORE_ENV=1**
+
+   On Windows just modify the file
+
+   **.vendor\bin\php-cs-fixer.bat**
+
+   as follow:
+
+   ```batch
+   @ECHO OFF
+   setlocal DISABLEDELAYEDEXPANSION
+   SET BIN_TARGET=%~dp0/php-cs-fixer
+   SET COMPOSER_RUNTIME_BIN_DIR=%~dp0
+   SET PHP_CS_FIXER_IGNORE_ENV=1
+   php "%BIN_TARGET%" %*
+   ```
+
+3) To check only, run:
+   ```bash
+    .\vendor\bin\php-cs-fixer check
+   ```
+4) To fix run
+   ```bash
+    .\vendor\bin\php-cs-fixer check
+   ```
+
+Note: after applying the fix you can only use PHP version >= 7.1