Merge branch '2.8' into 3.3

* 2.8:
  [HttpFoundation] Use the correct syntax for session gc based on Pdo driver
  Removed assertDateTimeEquals() methods.
  Revert "bug #24987 [Console] Fix global console flag when used in chain (Simperfit)"
  Revert "bug #25487 [Console] Fix a bug when passing a letter that could be an alias (Simperfit)"
  Disable CSP header on exception pages only in debug
  Fixed submitting disabled buttons
  Fixed Button::setParent() when already submitted
  Improve assertions
  Improve assertions
  SCA: get rid of repetitive calls
  allow null values for root nodes in YAML configs
  [VarDumper] Fix docblock
  Improve phpdoc to make it more explicit

Author: fabpot

ContainerBuilder.php

@@ -419,12 +419,16 @@ public function fileExists($path, $trackContents = true)
      * @throws BadMethodCallException When this ContainerBuilder is compiled
      * @throws \LogicException        if the extension is not registered
      */
-    public function loadFromExtension($extension, array $values = array())
+    public function loadFromExtension($extension, array $values = null)
     {
         if ($this->isCompiled()) {
             throw new BadMethodCallException('Cannot load from an extension on a compiled container.');
         }
 
+        if (func_num_args() < 2) {
+            $values = array();
+        }
+
         $namespace = $this->getExtension($extension)->getAlias();
 
         $this->extensionConfigs[$namespace][] = $values;

Loader/YamlFileLoader.php

@@ -755,7 +755,7 @@ private function loadFromExtensions(array $content)
                 continue;
             }
 
-            if (!is_array($values)) {
+            if (!is_array($values) && null !== $values) {
                 $values = array();
             }
 

Tests/Compiler/ResolveDefinitionTemplatesPassTest.php

@@ -259,23 +259,23 @@ public function testDeepDefinitionsResolving()
         $this->process($container);
 
         $configurator = $container->getDefinition('sibling')->getConfigurator();
-        $this->assertSame('Symfony\Component\DependencyInjection\Definition', get_class($configurator));
+        $this->assertInstanceOf('Symfony\Component\DependencyInjection\Definition', $configurator);
         $this->assertSame('parentClass', $configurator->getClass());
 
         $factory = $container->getDefinition('sibling')->getFactory();
-        $this->assertSame('Symfony\Component\DependencyInjection\Definition', get_class($factory[0]));
+        $this->assertInstanceOf('Symfony\Component\DependencyInjection\Definition', $factory[0]);
         $this->assertSame('parentClass', $factory[0]->getClass());
 
         $argument = $container->getDefinition('sibling')->getArgument(0);
-        $this->assertSame('Symfony\Component\DependencyInjection\Definition', get_class($argument));
+        $this->assertInstanceOf('Symfony\Component\DependencyInjection\Definition', $argument);
         $this->assertSame('parentClass', $argument->getClass());
 
         $properties = $container->getDefinition('sibling')->getProperties();
-        $this->assertSame('Symfony\Component\DependencyInjection\Definition', get_class($properties['prop']));
+        $this->assertInstanceOf('Symfony\Component\DependencyInjection\Definition', $properties['prop']);
         $this->assertSame('parentClass', $properties['prop']->getClass());
 
         $methodCalls = $container->getDefinition('sibling')->getMethodCalls();
-        $this->assertSame('Symfony\Component\DependencyInjection\Definition', get_class($methodCalls[0][1][0]));
+        $this->assertInstanceOf('Symfony\Component\DependencyInjection\Definition', $methodCalls[0][1][0]);
         $this->assertSame('parentClass', $methodCalls[0][1][0]->getClass());
     }
 

Tests/Fixtures/includes/ProjectExtension.php

@@ -8,7 +8,14 @@ class ProjectExtension implements ExtensionInterface
 {
     public function load(array $configs, ContainerBuilder $configuration)
     {
-        $config = call_user_func_array('array_merge', $configs);
+        $configuration->setParameter('project.configs', $configs);
+        $configs = array_filter($configs);
+
+        if ($configs) {
+            $config = call_user_func_array('array_merge', $configs);
+        } else {
+            $config = array();
+        }
 
         $configuration->setDefinition('project.service.bar', new Definition('FooClass'));
         $configuration->setParameter('project.parameter.bar', isset($config['foo']) ? $config['foo'] : 'foobar');

Tests/Fixtures/yaml/null_config.yml

@@ -0,0 +1 @@
+project: ~

Tests/Loader/YamlFileLoaderTest.php

@@ -219,6 +219,17 @@ public function testExtensions()
         }
     }
 
+    public function testExtensionWithNullConfig()
+    {
+        $container = new ContainerBuilder();
+        $container->registerExtension(new \ProjectExtension());
+        $loader = new YamlFileLoader($container, new FileLocator(self::$fixturesPath.'/yaml'));
+        $loader->load('null_config.yml');
+        $container->compile();
+
+        $this->assertSame(array(null), $container->getParameter('project.configs'));
+    }
+
     public function testSupports()
     {
         $loader = new YamlFileLoader(new ContainerBuilder(), new FileLocator());