diff --git a/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php b/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
index a18d1665c5..3e586ff71e 100644
--- a/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
+++ b/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
@@ -969,7 +969,7 @@ $bagClass
  */
 class $class extends $baseClass
 {
-    private \$parameters;
+    private \$parameters = [];
     private \$targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/custom_container_class_constructor_without_arguments.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/custom_container_class_constructor_without_arguments.php
index 7495110dd8..56f59d9ddc 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/custom_container_class_constructor_without_arguments.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/custom_container_class_constructor_without_arguments.php
@@ -18,7 +18,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class ProjectServiceContainer extends \Symfony\Component\DependencyInjection\Tests\Fixtures\Container\ConstructorWithoutArgumentsContainer
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/custom_container_class_with_mandatory_constructor_arguments.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/custom_container_class_with_mandatory_constructor_arguments.php
index eb573f9bae..9e1abeb447 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/custom_container_class_with_mandatory_constructor_arguments.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/custom_container_class_with_mandatory_constructor_arguments.php
@@ -18,7 +18,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class ProjectServiceContainer extends \Symfony\Component\DependencyInjection\Tests\Fixtures\Container\ConstructorWithMandatoryArgumentsContainer
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/custom_container_class_with_optional_constructor_arguments.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/custom_container_class_with_optional_constructor_arguments.php
index d322f80a0f..2fe30f22ef 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/custom_container_class_with_optional_constructor_arguments.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/custom_container_class_with_optional_constructor_arguments.php
@@ -18,7 +18,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class ProjectServiceContainer extends \Symfony\Component\DependencyInjection\Tests\Fixtures\Container\ConstructorWithOptionalArgumentsContainer
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/custom_container_class_without_constructor.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/custom_container_class_without_constructor.php
index 68bc1ef8be..c630ad090f 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/custom_container_class_without_constructor.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/custom_container_class_without_constructor.php
@@ -18,7 +18,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class ProjectServiceContainer extends \Symfony\Component\DependencyInjection\Tests\Fixtures\Container\NoConstructorContainer
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services1-1.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services1-1.php
index ed085a5ef9..3c0ced8e9f 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services1-1.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services1-1.php
@@ -18,7 +18,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class Container extends \Symfony\Component\DependencyInjection\Dump\AbstractContainer
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services1.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services1.php
index 9733ba9c6c..f7d49dd4da 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services1.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services1.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class ProjectServiceContainer extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services10.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services10.php
index 1b7443352d..961282993f 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services10.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services10.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class ProjectServiceContainer extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services12.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services12.php
index ba564b82f4..0e8f581e8a 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services12.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services12.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class ProjectServiceContainer extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services13.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services13.php
index 40ce06deca..52f5cf25fd 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services13.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services13.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class ProjectServiceContainer extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services19.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services19.php
index 664f4dd907..6f6f604519 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services19.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services19.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class ProjectServiceContainer extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services24.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services24.php
index b277ddd1c2..963118e209 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services24.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services24.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class ProjectServiceContainer extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services26.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services26.php
index 595d12ba60..95055207d1 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services26.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services26.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class Symfony_DI_PhpDumper_Test_EnvParameters extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services33.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services33.php
index d4019a50a7..915d053736 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services33.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services33.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class ProjectServiceContainer extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services8.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services8.php
index cc78c196ac..ce4815ef81 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services8.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services8.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class ProjectServiceContainer extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9.php
index 0e09ec624d..6dd0baabdc 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\ParameterBag;
  */
 class ProjectServiceContainer extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_as_files.txt b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_as_files.txt
index 2dc415ced4..ab7024fa5d 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_as_files.txt
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_as_files.txt
@@ -277,7 +277,7 @@ class ProjectServiceContainer extends Container
 {
     private $buildParameters;
     private $containerDir;
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct(array $buildParameters = [], $containerDir = __DIR__)
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_compiled.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_compiled.php
index 02e0680da0..c9df13b2e0 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_compiled.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services9_compiled.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class ProjectServiceContainer extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_adawson.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_adawson.php
index 7986897d37..f4364df7fc 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_adawson.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_adawson.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class ProjectServiceContainer extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_almost_circular_private.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_almost_circular_private.php
index 5f9bf8cee6..775235db69 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_almost_circular_private.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_almost_circular_private.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class Symfony_DI_PhpDumper_Test_Almost_Circular_Private extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_almost_circular_public.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_almost_circular_public.php
index f41f831b3c..d3bab9128a 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_almost_circular_public.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_almost_circular_public.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class Symfony_DI_PhpDumper_Test_Almost_Circular_Public extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_array_params.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_array_params.php
index be59456b0f..dd1ca0a61c 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_array_params.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_array_params.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class ProjectServiceContainer extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_base64_env.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_base64_env.php
index 8582c3e2df..709a3c4f8e 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_base64_env.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_base64_env.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class Symfony_DI_PhpDumper_Test_Base64Parameters extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_dedup_lazy_proxy.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_dedup_lazy_proxy.php
index ec3c8028bb..096b3b3964 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_dedup_lazy_proxy.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_dedup_lazy_proxy.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class ProjectServiceContainer extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_deep_graph.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_deep_graph.php
index 4158fc6288..0e3eed27fd 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_deep_graph.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_deep_graph.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class Symfony_DI_PhpDumper_Test_Deep_Graph extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_env_in_id.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_env_in_id.php
index ad76566b1a..e0e4827df9 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_env_in_id.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_env_in_id.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class ProjectServiceContainer extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_inline_requires.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_inline_requires.php
index 59582d9eb5..8418788364 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_inline_requires.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_inline_requires.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class ProjectServiceContainer extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_inline_self_ref.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_inline_self_ref.php
index 271aeb668b..906b0cdc70 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_inline_self_ref.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_inline_self_ref.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class Symfony_DI_PhpDumper_Test_Inline_Self_Ref extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_legacy_privates.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_legacy_privates.php
index 30dd2c9ba9..9a06061738 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_legacy_privates.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_legacy_privates.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class Symfony_DI_PhpDumper_Test_Legacy_Privates extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_locator.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_locator.php
index 4969b2db09..3826d5a6ee 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_locator.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_locator.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class ProjectServiceContainer extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_non_shared_lazy.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_non_shared_lazy.php
index b56063a184..4cea5d2d97 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_non_shared_lazy.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_non_shared_lazy.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class ProjectServiceContainer extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_private_frozen.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_private_frozen.php
index da1d716c58..95995dec62 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_private_frozen.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_private_frozen.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class ProjectServiceContainer extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_private_in_expression.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_private_in_expression.php
index c7fb579b07..56d73c2551 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_private_in_expression.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_private_in_expression.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class ProjectServiceContainer extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_rot13_env.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_rot13_env.php
index 8d1465c44b..a7ad1f1c66 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_rot13_env.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_rot13_env.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class Symfony_DI_PhpDumper_Test_Rot13Parameters extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_subscriber.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_subscriber.php
index dbb51eab32..ca89e01ccb 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_subscriber.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_subscriber.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class ProjectServiceContainer extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_tsantos.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_tsantos.php
index b14cdebb96..b314feff73 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_tsantos.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_tsantos.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class ProjectServiceContainer extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_uninitialized_ref.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_uninitialized_ref.php
index 7a24f72c59..a338c9d526 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_uninitialized_ref.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_uninitialized_ref.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class Symfony_DI_PhpDumper_Test_Uninitialized_Reference extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()
diff --git a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_unsupported_characters.php b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_unsupported_characters.php
index a4c841cabe..9e7e817df1 100644
--- a/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_unsupported_characters.php
+++ b/src/Symfony/Component/DependencyInjection/Tests/Fixtures/php/services_unsupported_characters.php
@@ -16,7 +16,7 @@ use Symfony\Component\DependencyInjection\ParameterBag\FrozenParameterBag;
  */
 class Symfony_DI_PhpDumper_Test_Unsupported_Characters extends Container
 {
-    private $parameters;
+    private $parameters = [];
     private $targetDirs = [];
 
     public function __construct()