Fix style and add config file to php-cs-fixer

tests/php-cs-fixer/php_cs.config

@@ -0,0 +1,55 @@
+<?php
+
+$header = <<<'EOF'
+This file is part of PHP CS Fixer.
+
+(c) Fabien Potencier <fabien@symfony.com>
+    Dariusz Rumiński <dariusz.ruminski@gmail.com>
+
+This source file is subject to the MIT license that is bundled
+with this source code in the file LICENSE.
+EOF;
+
+$finder = PhpCsFixer\Finder::create()
+    ->exclude('tests/Fixtures')
+    ->in(__DIR__)
+    ->append([__DIR__.'/php-cs-fixer'])
+;
+
+$config = PhpCsFixer\Config::create()
+    ->setRiskyAllowed(true)
+    ->setRules([
+        '@PHP56Migration' => true,
+        '@PHPUnit60Migration:risky' => true,
+        '@PhpCsFixer' => true,
+        '@PhpCsFixer:risky' => true,
+        'header_comment' => ['header' => $header],
+        'list_syntax' => ['syntax' => 'long'],
+        'mb_str_functions' => true,
+        'method_separation' => true,
+        'braces' => [
+            'position_after_anonymous_constructs' => 'next',
+            'position_after_control_structures' => 'next',
+            'position_after_functions_and_oop_constructs' => 'next'
+        ],
+    ])
+    ->setFinder($finder)
+;
+
+// special handling of fabbot.io service if it's using too old PHP CS Fixer version
+if (false !== getenv('FABBOT_IO')) {
+    try {
+        PhpCsFixer\FixerFactory::create()
+            ->registerBuiltInFixers()
+            ->registerCustomFixers($config->getCustomFixers())
+            ->useRuleSet(new PhpCsFixer\RuleSet($config->getRules()));
+    } catch (PhpCsFixer\ConfigurationException\InvalidConfigurationException $e) {
+        $config->setRules([]);
+    } catch (UnexpectedValueException $e) {
+        $config->setRules([]);
+    } catch (InvalidArgumentException $e) {
+        $config->setRules([]);
+    }
+}
+
+return $config;