feat: add PHP-CS-Fixer configuration and update composer.json for code style fixes

Author: wozozo

.gitignore

@@ -23,3 +23,6 @@ clover.xml
 
 # Ignore PHPUnit cache file
 .phpunit.result.cache
+
+# Ignore PHP-CS-Fixer cache file
+.php-cs-fixer.cache

.php-cs-fixer.dist.php

@@ -0,0 +1,17 @@
+<?php
+
+$finder = PhpCsFixer\Finder::create()
+    ->in(__DIR__)
+    ->exclude('vendor')
+    ->path('lib')
+    ->path('init.php')
+    ->path('build.php');
+
+$config = new PhpCsFixer\Config();
+return $config->setRules([
+        '@PSR12' => true,
+        'strict_param' => true,
+        'array_syntax' => ['syntax' => 'short'],
+        'no_unused_imports' => true,
+    ])
+    ->setFinder($finder);

composer.json

@@ -22,7 +22,8 @@
   },
   "require-dev": {
     "phpunit/phpunit": "~5.7 || ~9.5",
-    "squizlabs/php_codesniffer": "~3.6"
+    "squizlabs/php_codesniffer": "~3.6",
+    "friendsofphp/php-cs-fixer": "^3.75"
   },
   "autoload": {
     "psr-4": { "Payjp\\" : "lib/" }
@@ -36,6 +37,9 @@
      "test": [
        "phpcs --standard=PSR2 -n lib tests *.php",
        "phpunit"
+     ],
+     "fix": [
+       "PHP_CS_FIXER_IGNORE_ENV=1 ./vendor/bin/php-cs-fixer fix --allow-risky=yes"
      ]
   }
 }