bug #17971 Variadic controller params (NiR-, fabpot)

This PR was merged into the 2.3 branch.

Discussion
----------

Variadic controller params

| Q             | A
| ------------- | ---
| Branch        | 2.3
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #15777
| License       | MIT

Commits
-------

bedcb15 simplified code
f39afc8 Allow variadic controller parameters to be resolved.

src/Symfony/Component/HttpKernel/Controller/ControllerResolver.php

@@ -119,7 +119,11 @@ protected function doGetArguments(Request $request, $controller, array $paramete
         $arguments = array();
         foreach ($parameters as $param) {
             if (array_key_exists($param->name, $attributes)) {
-                $arguments[] = $attributes[$param->name];
+                if (PHP_VERSION_ID >= 50600 && $param->isVariadic() && is_array($attributes[$param->name])) {
+                    $arguments = array_merge($arguments, array_values($attributes[$param->name]));
+                } else {
+                    $arguments[] = $attributes[$param->name];
+                }
             } elseif ($param->getClass() && $param->getClass()->isInstance($request)) {
                 $arguments[] = $request;
             } elseif ($param->isDefaultValueAvailable()) {

src/Symfony/Component/HttpKernel/Tests/Controller/ControllerResolverTest.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\HttpKernel\Tests\Controller;
 
 use Symfony\Component\HttpKernel\Controller\ControllerResolver;
+use Symfony\Component\HttpKernel\Tests\Fixtures\Controller\VariadicController;
 use Symfony\Component\HttpFoundation\Request;
 
 class ControllerResolverTest extends \PHPUnit_Framework_TestCase
@@ -196,6 +197,20 @@ public function testGetArguments()
         $this->assertEquals(array($request), $resolver->getArguments($request, $controller), '->getArguments() injects the request');
     }
 
+    /**
+     * @requires PHP 5.6
+     */
+    public function testGetVariadicArguments()
+    {
+        $resolver = new ControllerResolver();
+
+        $request = Request::create('/');
+        $request->attributes->set('foo', 'foo');
+        $request->attributes->set('bar', array('foo', 'bar'));
+        $controller = array(new VariadicController(), 'action');
+        $this->assertEquals(array('foo', 'foo', 'bar'), $resolver->getArguments($request, $controller));
+    }
+
     public function testCreateControllerCanReturnAnyCallable()
     {
         $mock = $this->getMock('Symfony\Component\HttpKernel\Controller\ControllerResolver', array('createController'));

src/Symfony/Component/HttpKernel/Tests/Fixtures/Controller/VariadicController.php

@@ -0,0 +1,10 @@
+<?php
+
+namespace Symfony\Component\HttpKernel\Tests\Fixtures\Controller;
+
+class VariadicController
+{
+    public function action($foo, ...$bar)
+    {
+    }
+}