Add php-cs-fixer

.php_cs

@@ -0,0 +1,20 @@
+<?php
+
+$finder = Symfony\CS\Finder\DefaultFinder::create()
+    ->in(__DIR__ . "/src");
+
+return Symfony\CS\Config\Config::create()
+    ->level(\Symfony\CS\FixerInterface::PSR2_LEVEL)
+    ->fixers([
+        'unused_use',
+        'remove_lines_between_uses',
+        'remove_leading_slash_use',
+        'ordered_use',
+        'short_array_syntax',
+        'whitespacy_lines',
+        'ternary_spaces',
+        'standardize_not_equal',
+        'spaces_cast',
+        'extra_empty_lines',
+    ])
+    ->finder($finder);

.travis.yml

@@ -7,7 +7,7 @@ php:
 
 install: composer require --no-update symfony/http-foundation $SYMFONY_VERSION; composer install
 
-script: vendor/bin/phpunit
+script: vendor/bin/phpunit && vendor/bin/php-cs-fixer fix -v --dry-run
 
 env:
   - SYMFONY_VERSION: ~2.8.0

composer.json

@@ -24,6 +24,7 @@
         "symfony/http-foundation": "~2.8|~3.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "~4.8"
+        "phpunit/phpunit": "~4.8",
+        "friendsofphp/php-cs-fixer": "^1.11"
     }
 }