Add php-cs-fixer (#133)

Author: Rom1-B

.php-cs-fixer.php

@@ -0,0 +1,21 @@
+<?php
+
+use PhpCsFixer\Config;
+use PhpCsFixer\Finder;
+
+$finder = Finder::create()
+    ->in(__DIR__)
+    ->name('*.php')
+    ->ignoreVCSIgnored(true);
+
+$config = new Config();
+
+$rules = [
+    '@PER-CS2.0'                  => true,
+    'trailing_comma_in_multiline' => ['elements' => ['arguments', 'array_destructuring', 'arrays']], // For PHP 7.4 compatibility
+];
+
+return $config
+    ->setRules($rules)
+    ->setFinder($finder)
+    ->setUsingCache(false);

composer.json

@@ -3,13 +3,17 @@
         "php": ">=7.4"
     },
     "require-dev": {
+        "friendsofphp/php-cs-fixer": "^3.73",
         "glpi-project/tools": "^0.7"
     },
     "config": {
         "optimize-autoloader": true,
         "platform": {
             "php": "7.4.0"
         },
-        "sort-packages": true
+        "sort-packages": true,
+        "allow-plugins": {
+            "phpstan/extension-installer": true
+        }
     }
 }