Added php code style fixer

.gitignore

@@ -3,6 +3,8 @@ composer.phar
 
 vendor
 
+.php_cs.cache
+
 # IntelliJ project files
 *.iml
 *.iws

.php_cs

@@ -0,0 +1,56 @@
+<?php
+
+require_once __DIR__ . '/vendor/autoload.php';
+
+$finder = PhpCsFixer\Finder::create()
+    ->files()
+    ->name('*.php')
+    ->in(__DIR__)
+    ->exclude([
+        'vendor',
+    ])
+    ->ignoreDotFiles(true)
+    ->ignoreVCS(true)
+;
+
+return PhpCsFixer\Config::create()
+    ->setRiskyAllowed(true)
+    ->setRules([
+        '@Symfony' => true,
+        '@Symfony:risky' => true,
+
+        // exceptions
+        'single_line_throw' => false,
+
+        // php file
+        'concat_space' => ['spacing' => 'one'],
+
+        // namespace and imports
+        'ordered_imports' => true,
+        'global_namespace_import' => [
+            'import_classes' => false,
+            'import_constants' => false,
+            'import_functions' => false,
+        ],
+
+        // standard functions and operators
+        'native_constant_invocation' => false,
+        'native_function_invocation' => false,
+        'modernize_types_casting' => true,
+        'is_null' => true,
+
+        // arrays
+        'array_syntax' => [
+            'syntax' => 'short',
+        ],
+
+        // phpdoc
+        'phpdoc_annotation_without_dot' => false,
+        'phpdoc_summary' => false,
+
+        // logical operators
+        'logical_operators' => true,
+    ])
+    ->setFinder($finder)
+    ->setCacheFile(__DIR__ . '.php_cs.cache')
+;

.travis.yml

@@ -0,0 +1,18 @@
+language: php
+
+cache:
+  directories:
+    - $HOME/.composer/cache
+
+php:
+  - '7.3'
+
+before_script:
+  - flags="-o"
+  - composer install $flags
+
+script:
+  - php vendor/bin/php-cs-fixer fix --diff --dry-run --using-cache no --config .php_cs
+
+after_success:
+  - bash <(curl -s https://codecov.io/bash)

composer.json

@@ -28,6 +28,7 @@
     "symfony/validator": "^5.1"
   },
   "require-dev": {
-    "doctrine/doctrine-fixtures-bundle": "^3.3"
+    "doctrine/doctrine-fixtures-bundle": "^3.3",
+    "friendsofphp/php-cs-fixer": "^2.0"
   }
-}
+}