Merge branch '3.4' into 4.0

* 3.4:
  [FrameworkBundle] fixed brackets position in method calls
  [Form] Fix PHPDoc for FormConfigBuilder $dataClass argument
  [Security] Update user phpdoc on tokens
  [WebProfilerBundle] Fixed icon alignment issue using Bootstrap 4.1.2
  suppress side effects in 'get' or 'has' methods of NamespacedAttributeBag
  [HttpFoundation] reset callback on StreamedResponse when setNotModified() is called
  [HttpFoundation] Fixed phpdoc for get method of HeaderBag
  fix typo in ContainerBuilder docblock
  [Form/Profiler] Massively reducing memory footprint of form profiling pages by removing redundant 'form' variable from view variables.
  [Console] correctly return parameter's default value on "--"

Author: fabpot

HeaderBag.php

@@ -101,11 +101,11 @@ public function add(array $headers)
     /**
      * Returns a header value by name.
      *
-     * @param string          $key     The header name
-     * @param string|string[] $default The default value
-     * @param bool            $first   Whether to return the first value or all header values
+     * @param string               $key     The header name
+     * @param string|string[]|null $default The default value
+     * @param bool                 $first   Whether to return the first value or all header values
      *
-     * @return string|string[] The first header value or default value if $first is true, an array of values otherwise
+     * @return string|string[]|null The first header value or default value if $first is true, an array of values otherwise
      */
     public function get($key, $default = null, $first = true)
     {

Session/Attribute/NamespacedAttributeBag.php

@@ -124,7 +124,13 @@ protected function &resolveAttributePath($name, $writeContext = false)
 
         foreach ($parts as $part) {
             if (null !== $array && !array_key_exists($part, $array)) {
-                $array[$part] = $writeContext ? array() : null;
+                if (!$writeContext) {
+                    $null = null;
+
+                    return $null;
+                }
+
+                $array[$part] = array();
             }
 
             $array = &$array[$part];

StreamedResponse.php

@@ -141,4 +141,16 @@ public function getContent()
     {
         return false;
     }
+
+    /**
+     * {@inheritdoc}
+     *
+     * @return $this
+     */
+    public function setNotModified()
+    {
+        $this->setCallback(function () {});
+
+        return parent::setNotModified();
+    }
 }

Tests/ResponseTest.php

@@ -126,7 +126,7 @@ public function testMustRevalidateWithProxyRevalidateCacheControlHeader()
 
     public function testSetNotModified()
     {
-        $response = new Response();
+        $response = new Response('foo');
         $modified = $response->setNotModified();
         $this->assertObjectHasAttribute('headers', $modified);
         $this->assertObjectHasAttribute('content', $modified);
@@ -135,6 +135,11 @@ public function testSetNotModified()
         $this->assertObjectHasAttribute('statusText', $modified);
         $this->assertObjectHasAttribute('charset', $modified);
         $this->assertEquals(304, $modified->getStatusCode());
+
+        ob_start();
+        $modified->sendContent();
+        $string = ob_get_clean();
+        $this->assertEmpty($string);
     }
 
     public function testIsSuccessful()

Tests/Session/Attribute/NamespacedAttributeBagTest.php

@@ -82,6 +82,17 @@ public function testHas($key, $value, $exists)
         $this->assertEquals($exists, $this->bag->has($key));
     }
 
+    /**
+     * @dataProvider attributesProvider
+     */
+    public function testHasNoSideEffect($key, $value, $expected)
+    {
+        $expected = json_encode($this->bag->all());
+        $this->bag->has($key);
+
+        $this->assertEquals($expected, json_encode($this->bag->all()));
+    }
+
     /**
      * @dataProvider attributesProvider
      */
@@ -96,6 +107,17 @@ public function testGetDefaults()
         $this->assertEquals('default', $this->bag->get('user2.login', 'default'));
     }
 
+    /**
+     * @dataProvider attributesProvider
+     */
+    public function testGetNoSideEffect($key, $value, $expected)
+    {
+        $expected = json_encode($this->bag->all());
+        $this->bag->get($key);
+
+        $this->assertEquals($expected, json_encode($this->bag->all()));
+    }
+
     /**
      * @dataProvider attributesProvider
      */

Tests/StreamedResponseTest.php

@@ -123,4 +123,22 @@ public function testReturnThis()
         $this->assertInstanceOf('Symfony\Component\HttpFoundation\StreamedResponse', $response->sendHeaders());
         $this->assertInstanceOf('Symfony\Component\HttpFoundation\StreamedResponse', $response->sendHeaders());
     }
+
+    public function testSetNotModified()
+    {
+        $response = new StreamedResponse(function () { echo 'foo'; });
+        $modified = $response->setNotModified();
+        $this->assertObjectHasAttribute('headers', $modified);
+        $this->assertObjectHasAttribute('content', $modified);
+        $this->assertObjectHasAttribute('version', $modified);
+        $this->assertObjectHasAttribute('statusCode', $modified);
+        $this->assertObjectHasAttribute('statusText', $modified);
+        $this->assertObjectHasAttribute('charset', $modified);
+        $this->assertEquals(304, $modified->getStatusCode());
+
+        ob_start();
+        $modified->sendContent();
+        $string = ob_get_clean();
+        $this->assertEmpty($string);
+    }
 }