Merge branch '2.8' into 3.2

* 2.8:
  [Console] Do not duplicate Helper::strlen() code
  [FrameworkBundle] Adding the extension XML
  [Form] Minor: Fix comment in ChoiceType
  [FrameworkBundle] AbstractConfigCommand: do not try registering bundles twice

src/Symfony/Bundle/FrameworkBundle/Command/AbstractConfigCommand.php

@@ -117,7 +117,7 @@ abstract class AbstractConfigCommand extends ContainerDebugCommand
         // Re-build bundle manually to initialize DI extensions that can be extended by other bundles in their build() method
         // as this method is not called when the container is loaded from the cache.
         $container = $this->getContainerBuilder();
-        $bundles = $this->getContainer()->get('kernel')->registerBundles();
+        $bundles = $this->getContainer()->get('kernel')->getBundles();
         foreach ($bundles as $bundle) {
             if ($extension = $bundle->getContainerExtension()) {
                 $container->registerExtension($extension);

src/Symfony/Bundle/FrameworkBundle/composer.json

@@ -17,6 +17,7 @@
     ],
     "require": {
         "php": ">=5.5.9",
+        "ext-xml": "*",
         "symfony/cache": "~3.2.2|~3.3",
         "symfony/class-loader": "~3.2",
         "symfony/dependency-injection": "~3.2.1|~3.3",

src/Symfony/Component/Console/Application.php

@@ -14,6 +14,7 @@ namespace Symfony\Component\Console;
 use Symfony\Component\Console\Exception\ExceptionInterface;
 use Symfony\Component\Console\Formatter\OutputFormatter;
 use Symfony\Component\Console\Helper\DebugFormatterHelper;
+use Symfony\Component\Console\Helper\Helper;
 use Symfony\Component\Console\Helper\ProcessHelper;
 use Symfony\Component\Console\Helper\QuestionHelper;
 use Symfony\Component\Console\Input\InputInterface;
@@ -638,7 +639,7 @@ class Application
                 $output->isVerbose() && 0 !== ($code = $e->getCode()) ? ' ('.$code.')' : ''
             );
 
-            $len = $this->stringWidth($title);
+            $len = Helper::strlen($title);
 
             $width = $this->terminal->getWidth() ? $this->terminal->getWidth() - 1 : PHP_INT_MAX;
             // HHVM only accepts 32 bits integer in str_split, even when PHP_INT_MAX is a 64 bit integer: https://github.com/facebook/hhvm/issues/1327
@@ -649,7 +650,7 @@ class Application
             foreach (preg_split('/\r?\n/', $e->getMessage()) as $line) {
                 foreach ($this->splitStringByWidth($line, $width - 4) as $line) {
                     // pre-format lines to get the right string length
-                    $lineLength = $this->stringWidth($line) + 4;
+                    $lineLength = Helper::strlen($line) + 4;
                     $lines[] = array($line, $lineLength);
 
                     $len = max($lineLength, $len);
@@ -658,7 +659,7 @@ class Application
 
             $messages = array();
             $messages[] = $emptyLine = sprintf('<error>%s</error>', str_repeat(' ', $len));
-            $messages[] = sprintf('<error>%s%s</error>', $title, str_repeat(' ', max(0, $len - $this->stringWidth($title))));
+            $messages[] = sprintf('<error>%s%s</error>', $title, str_repeat(' ', max(0, $len - Helper::strlen($title))));
             foreach ($lines as $line) {
                 $messages[] = sprintf('<error>  %s  %s</error>', OutputFormatter::escape($line[0]), str_repeat(' ', $len - $line[1]));
             }
@@ -1038,15 +1039,6 @@ class Application
         return $this;
     }
 
-    private function stringWidth($string)
-    {
-        if (false === $encoding = mb_detect_encoding($string, null, true)) {
-            return strlen($string);
-        }
-
-        return mb_strwidth($string, $encoding);
-    }
-
     private function splitStringByWidth($string, $width)
     {
         // str_split is not suitable for multi-byte characters, we should use preg_split to get char array properly.

src/Symfony/Component/Form/Extension/Core/Type/ChoiceType.php

@@ -158,7 +158,7 @@ class ChoiceType extends AbstractType
         }
 
         // To avoid issues when the submitted choices are arrays (i.e. array to string conversions),
-        // we have to ensure that all elements of the submitted choice data are strings or null.
+        // we have to ensure that all elements of the submitted choice data are NULL, strings or ints.
         $builder->addEventListener(FormEvents::PRE_SUBMIT, function (FormEvent $event) {
             $data = $event->getData();