chore: add PHPStan, PHP CS Fixer and update CI

.github/workflows/ci.yml

@@ -22,5 +22,11 @@ jobs:
       - name: Install dependencies
         run: composer install --no-interaction --prefer-dist
 
+      - name: PHP CS Fixer
+        run: vendor/bin/php-cs-fixer fix src --dry-run --diff
+
+      - name: PHPStan
+        run: vendor/bin/phpstan analyse --memory-limit=512M
+
       - name: Run PHPUnit
         run: vendor/bin/phpunit

.php-cs-fixer.dist.php

@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+use PhpCsFixer\Config;
+use PhpCsFixer\Finder;
+
+return (new Config())
+    ->setRiskyAllowed(false)
+    ->setRules([
+        '@auto' => true
+    ])
+    // 💡 by default, Fixer looks for `*.php` files excluding `./vendor/` - here, you can groom this config
+    ->setFinder(
+        (new Finder())
+            // 💡 root folder to check
+            ->in(__DIR__)
+            // 💡 additional files, eg bin entry file
+            // ->append([__DIR__.'/bin-entry-file'])
+            // 💡 folders to exclude, if any
+            // ->exclude([/* ... */])
+            // 💡 path patterns to exclude, if any
+            // ->notPath([/* ... */])
+            // 💡 extra configs
+            // ->ignoreDotFiles(false) // true by default in v3, false in v4 or future mode
+            // ->ignoreVCS(true) // true by default
+    )
+;

composer.json

@@ -11,6 +11,8 @@
         }
     },
     "require-dev": {
-        "phpunit/phpunit": "^13.2"
+        "phpunit/phpunit": "^13.2",
+        "phpstan/phpstan": "^2.2",
+        "friendsofphp/php-cs-fixer": "^3.95"
     }
-}
+}