Add PHP_CodeSniffer tooling

.gitignore

@@ -2,4 +2,5 @@
 /vendor/
 .php-cs-fixer.php
 composer.lock
+phpcs.xml
 phpstan.neon

.php-cs-fixer.dist.php

@@ -1,8 +1,8 @@
 <?php
 
 /**
- * Useful PHP Basics
- * Copyright (C) 2023 Sebastian Meyer <sebastian.meyer@opencultureconsulting.com>
+ * PHP Basics
+ * Copyright (C) 2024 Sebastian Meyer <sebastian.meyer@opencultureconsulting.com>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -30,9 +30,5 @@ namespace PhpCsFixer;
  */
 return (new Config())
     ->setRiskyAllowed(true)
-    ->setRules([
-        '@PSR12' => true,
-    ])
-    ->setFinder(
-        (new Finder())->in(__DIR__)
-    );
+    ->setRules(['@PSR12' => true])
+    ->setFinder((new Finder())->in(__DIR__));

composer.json

@@ -37,7 +37,8 @@
     "require-dev": {
         "phpstan/phpstan": "^1.10.56",
         "phpstan/phpstan-strict-rules": "^1.5",
-        "friendsofphp/php-cs-fixer": "^3.48"
+        "friendsofphp/php-cs-fixer": "^3.48",
+        "squizlabs/php_codesniffer": "^3.8"
     },
     "autoload": {
         "psr-4": {

phpcs.xml.dist

@@ -0,0 +1,7 @@
+<?xml version="1.0"?>
+<ruleset name="OCC Standard Ruleset">
+    <description>Open Culture Consulting strictly follows PSR standards.</description>
+    <file>./src</file>
+    <arg name="extensions" value="php"/>
+    <rule ref="PSR12"/>
+</ruleset>