Merge branch '3.4' into 4.0

* 3.4: (37 commits)
  Remove some unused variables and properties
  [appveyor] disable memory limit on composer up
  [HttpFoundation] don't prefix cookies with "Set-Cookie:"
  Remove some unused variables and properties
  Fix debug:form definition
  Remove some unused variables, properties and methods
  fix some edge cases with indented blocks
  [ExpressionLanguage] Fix parse error on 5.3
  [HttpKernel] remove noisy frame in controller stack traces
  [DI] Force root-namespace for function calls in the dumper container
  [DI] Fix circular-aliases message
  register system cache clearer only if it's used
  doc : Namespace prefix must end with a "\"
  [ExpressionLanguage] throw an SyntaxError instead of letting a undefined index notice
  Prevent a loop in aliases within the `findDefinition` method
  [HttpKernel] Disable inlining on PHP 5
  Ensure that inlined services with parameterized class name can be dumped
  [DI] Fix non-string class handling in PhpDumper
  Throw a sensible exception when controller has been removed
  Remove LOCK_EX That Breaks Cache Usage on NFS
  ...

Author: nicolas-grekas

Encoder/CsvEncoder.php

@@ -109,6 +109,7 @@ public function decode($data, $format, array $context = array())
 
         $headers = null;
         $nbHeaders = 0;
+        $headerCount = array();
         $result = array();
 
         list($delimiter, $enclosure, $escapeChar, $keySeparator) = $this->getCsvOptions($context);
@@ -120,15 +121,17 @@ public function decode($data, $format, array $context = array())
                 $nbHeaders = $nbCols;
 
                 foreach ($cols as $col) {
-                    $headers[] = explode($keySeparator, $col);
+                    $header = explode($keySeparator, $col);
+                    $headers[] = $header;
+                    $headerCount[] = count($header);
                 }
 
                 continue;
             }
 
             $item = array();
             for ($i = 0; ($i < $nbCols) && ($i < $nbHeaders); ++$i) {
-                $depth = count($headers[$i]);
+                $depth = $headerCount[$i];
                 $arr = &$item;
                 for ($j = 0; $j < $depth; ++$j) {
                     // Handle nested arrays

Encoder/JsonDecode.php

@@ -24,7 +24,6 @@ class JsonDecode implements DecoderInterface
 
     private $associative;
     private $recursionDepth;
-    private $lastError = JSON_ERROR_NONE;
 
     /**
      * Constructs a new JsonDecode instance.
@@ -75,7 +74,7 @@ public function decode($data, $format, array $context = array())
 
         $decodedData = json_decode($data, $associative, $recursionDepth, $options);
 
-        if (JSON_ERROR_NONE !== $this->lastError = json_last_error()) {
+        if (JSON_ERROR_NONE !== json_last_error()) {
             throw new NotEncodableValueException(json_last_error_msg());
         }
 

Encoder/JsonEncode.php

@@ -21,7 +21,6 @@
 class JsonEncode implements EncoderInterface
 {
     private $options;
-    private $lastError = JSON_ERROR_NONE;
 
     public function __construct(int $bitmask = 0)
     {
@@ -39,7 +38,7 @@ public function encode($data, $format, array $context = array())
 
         $encodedJson = json_encode($data, $context['json_encode_options']);
 
-        if (JSON_ERROR_NONE !== $this->lastError = json_last_error()) {
+        if (JSON_ERROR_NONE !== json_last_error()) {
             throw new NotEncodableValueException(json_last_error_msg());
         }
 

Normalizer/AbstractNormalizer.php

@@ -388,6 +388,8 @@ protected function createChildContext(array $parentContext, $attribute)
     {
         if (isset($parentContext[self::ATTRIBUTES][$attribute])) {
             $parentContext[self::ATTRIBUTES] = $parentContext[self::ATTRIBUTES][$attribute];
+        } else {
+            unset($parentContext[self::ATTRIBUTES]);
         }
 
         return $parentContext;

Tests/Normalizer/ObjectNormalizerTest.php

@@ -683,6 +683,16 @@ public function testAttributesContextNormalize()
             ),
             $serializer->normalize($objectDummy, null, $context)
         );
+
+        $context = array('attributes' => array('foo', 'baz', 'object'));
+        $this->assertEquals(
+            array(
+                'foo' => 'foo',
+                'baz' => true,
+                'object' => array('foo' => 'innerFoo', 'bar' => 'innerBar'),
+            ),
+            $serializer->normalize($objectDummy, null, $context)
+        );
     }
 
     public function testAttributesContextDenormalize()