Suggest php-cs-fixer and add default config

See .php_cs for default configuration. Install php-cs-fixer globally and run
  php-cs-fixer fix
to fix common coding standards or style issues.

.php_cs

@@ -0,0 +1,29 @@
+<?php
+
+$finder = Symfony\CS\Finder\DefaultFinder::create()
+    ->files()
+    ->name('*.php')
+    ->name('*.phpt')
+    ->in('library')
+    ->in('tests');
+
+return Symfony\CS\Config\Config::create()
+    ->level(\Symfony\CS\FixerInterface::PSR2_LEVEL)
+    ->fixers(array(
+        // All items of the @param, @throws, @return, @var, and @type phpdoc
+        // tags must be aligned vertically.
+        'phpdoc_params',
+        // Convert double quotes to single quotes for simple strings.
+        'single_quote',
+        // Group and seperate @phpdocs with empty lines.
+        'phpdoc_separation',
+        // An empty line feed should precede a return statement.
+        'return',
+        // Remove trailing whitespace at the end of blank lines.
+        'whitespacy_lines',
+        // Removes extra empty lines.
+        'extra_empty_lines',
+        // Unused use statements must be removed.
+        'unused_use'
+    ))
+    ->finder($finder);

CONTRIBUTING.md

@@ -140,6 +140,21 @@ No test should fail.
 You can tweak the PHPUnit's settings by copying `phpunit.xml.dist` to `phpunit.xml`
 and changing it according to your needs.
 
+## Coding style and standards
+
+We follow the [PSR-2](http://www.php-fig.org/psr/psr-2/) coding style and
+[PSR-4](http://www.php-fig.org/psr/psr-4/) autoloading standard.
+
+There are some preferences regarding code style which you can easily adhere to
+by using [php-cs-fixer](https://github.com/FriendsOfPHP/PHP-CS-Fixer).
+
+This will format all PHP files consistently using the preferences of this
+project.
+
+```sh
+$ vendor/bin/php-cs-fixer fix
+```
+
 ***
 
 See also:

composer.json

@@ -28,7 +28,8 @@
         "egulias/email-validator": "Strict (RFC compliant) email validation",
         "malkusch/bav": "German bank account validation",
         "symfony/validator": "Use Symfony validator through Respect\\Validation",
-        "zendframework/zend-validator": "Use Zend Framework validator through Respect\\Validation"
+        "zendframework/zend-validator": "Use Zend Framework validator through Respect\\Validation",
+        "fabpot/php-cs-fixer": "Fix PSR2 and other coding style issues"
     },
     "autoload": {
         "psr-4": {

library/Rules/Tld.php

@@ -92,7 +92,7 @@ class Tld extends AbstractRule
         'uol', 'vacations', 'vegas', 'ventures', 'versicherung', 'vet', 'viajes', 'video',
         'villas', 'vision', 'vista', 'vistaprint', 'vlaanderen', 'vodka', 'vote', 'voting',
         'voto', 'voyage', 'wales', 'walter', 'wang', 'watch', 'webcam', 'website', 'wed',
-        'wedding', 'weir', 'whoswho', 'wien', 'wiki', 'williamhill', 'win', 'windows', 
+        'wedding', 'weir', 'whoswho', 'wien', 'wiki', 'williamhill', 'win', 'windows',
         'wme', 'work', 'works', 'world', 'wtc', 'wtf', 'xbox', 'xerox', 'xin', 'xyz',
         'yachts', 'yandex', 'yodobashi', 'yoga', 'yokohama', 'youtube', 'zip', 'zone', 'zuerich',
         //country

tests/Exceptions/AbstractNestedExceptionTest.php

@@ -11,8 +11,6 @@
 
 namespace Respect\Validation\Exceptions;
 
-use Respect\Validation\Validator as v;
-
 /**
  * phpunit has an issue with mocking exceptions when in HHVM:
  * https://github.com/sebastianbergmann/phpunit-mock-objects/issues/207

tests/Exceptions/ValidationExceptionTest.php

@@ -97,12 +97,12 @@ class ValidationExceptionTest extends \PHPUnit_Framework_TestCase
             array(array(), ''),
             array(array(array(), 'foo'), "(), 'foo'"),
             array(array(array(1), 'foo'), "(1), 'foo'"),
-            array(array(1, array(2, array(3))), "1, (2, (3))"),
-            array(array(1, array(2, array(3, array(4)))), "1, (2, (3, (4)))"),
-            array(array(1, array(2, array(3, array(4, array(5))))), "1, (2, (3, (4, ...)))"),
+            array(array(1, array(2, array(3))), '1, (2, (3))'),
+            array(array(1, array(2, array(3, array(4)))), '1, (2, (3, (4)))'),
+            array(array(1, array(2, array(3, array(4, array(5))))), '1, (2, (3, (4, ...)))'),
             array(array('foo', 'bar'), "'foo', 'bar'"),
             array(array('foo', -1), "'foo', -1"),
-            array(array(new \stdClass, "foo"), "Object of class stdClass, 'foo'"),
+            array(array(new \stdClass, 'foo'), "Object of class stdClass, 'foo'"),
             array(new \stdClass, 'Object of class stdClass'),
             array($x = new \DateTime, $x->format('Y-m-d H:i:s')),
         );