diff --git a/src/Symfony/Component/DependencyInjection/ContainerBuilder.php b/src/Symfony/Component/DependencyInjection/ContainerBuilder.php
index 9f375741e0..d26c0ec459 100644
--- a/src/Symfony/Component/DependencyInjection/ContainerBuilder.php
+++ b/src/Symfony/Component/DependencyInjection/ContainerBuilder.php
@@ -806,10 +806,8 @@ class ContainerBuilder extends Container implements TaggedContainerInterface
         }
 
         if ($callable = $definition->getConfigurator()) {
-            if (is_array($callable) && is_object($callable[0]) && $callable[0] instanceof Reference) {
-                $callable[0] = $this->get((string) $callable[0]);
-            } elseif (is_array($callable)) {
-                $callable[0] = $parameterBag->resolveValue($callable[0]);
+            if (is_array($callable)) {
+                $callable[0] = $callable[0] instanceof Reference ? $this->get((string) $callable[0]) : $parameterBag->resolveValue($callable[0]);
             }
 
             if (!is_callable($callable)) {
@@ -835,9 +833,9 @@ class ContainerBuilder extends Container implements TaggedContainerInterface
             foreach ($value as &$v) {
                 $v = $this->resolveServices($v);
             }
-        } elseif (is_object($value) && $value instanceof Reference) {
+        } elseif ($value instanceof Reference) {
             $value = $this->get((string) $value, $value->getInvalidBehavior());
-        } elseif (is_object($value) && $value instanceof Definition) {
+        } elseif ($value instanceof Definition) {
             $value = $this->createService($value, null);
         }
 
@@ -895,7 +893,7 @@ class ContainerBuilder extends Container implements TaggedContainerInterface
             foreach ($value as $v) {
                 $services = array_unique(array_merge($services, self::getServiceConditionals($v)));
             }
-        } elseif (is_object($value) && $value instanceof Reference && $value->getInvalidBehavior() === ContainerInterface::IGNORE_ON_INVALID_REFERENCE) {
+        } elseif ($value instanceof Reference && $value->getInvalidBehavior() === ContainerInterface::IGNORE_ON_INVALID_REFERENCE) {
             $services[] = (string) $value;
         }
 
diff --git a/src/Symfony/Component/DependencyInjection/Dumper/GraphvizDumper.php b/src/Symfony/Component/DependencyInjection/Dumper/GraphvizDumper.php
index debdc52709..00b212a1b4 100644
--- a/src/Symfony/Component/DependencyInjection/Dumper/GraphvizDumper.php
+++ b/src/Symfony/Component/DependencyInjection/Dumper/GraphvizDumper.php
@@ -130,7 +130,7 @@ class GraphvizDumper extends Dumper
     {
         $edges = array();
         foreach ($arguments as $argument) {
-            if (is_object($argument) && $argument instanceof Parameter) {
+            if ($argument instanceof Parameter) {
                 $argument = $this->container->hasParameter($argument) ? $this->container->getParameter($argument) : null;
             } elseif (is_string($argument) && preg_match('/^%([^%]+)%$/', $argument, $match)) {
                 $argument = $this->container->hasParameter($match[1]) ? $this->container->getParameter($match[1]) : null;
diff --git a/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php b/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
index f64da99049..36ad24a159 100644
--- a/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
+++ b/src/Symfony/Component/DependencyInjection/Dumper/PhpDumper.php
@@ -452,7 +452,7 @@ class PhpDumper extends Dumper
         }
 
         if (is_array($callable)) {
-            if (is_object($callable[0]) && $callable[0] instanceof Reference) {
+            if ($callable[0] instanceof Reference) {
                 return sprintf("        %s->%s(\$%s);\n", $this->getServiceCall((string) $callable[0]), $callable[1], $variableName);
             }
 
@@ -997,7 +997,7 @@ EOF;
             }
 
             return sprintf('array(%s)', implode(', ', $code));
-        } elseif (is_object($value) && $value instanceof Definition) {
+        } elseif ($value instanceof Definition) {
             if (null !== $this->definitionVariables && $this->definitionVariables->contains($value)) {
                 return $this->dumpValue($this->definitionVariables->offsetGet($value), $interpolate);
             }
@@ -1029,15 +1029,15 @@ EOF;
             }
 
             return sprintf("new \\%s(%s)", substr(str_replace('\\\\', '\\', $class), 1, -1), implode(', ', $arguments));
-        } elseif (is_object($value) && $value instanceof Variable) {
+        } elseif ($value instanceof Variable) {
             return '$'.$value;
-        } elseif (is_object($value) && $value instanceof Reference) {
+        } elseif ($value instanceof Reference) {
             if (null !== $this->referenceVariables && isset($this->referenceVariables[$id = (string) $value])) {
                 return $this->dumpValue($this->referenceVariables[$id], $interpolate);
             }
 
             return $this->getServiceCall((string) $value, $value);
-        } elseif (is_object($value) && $value instanceof Parameter) {
+        } elseif ($value instanceof Parameter) {
             return $this->dumpParameter($value);
         } elseif (true === $interpolate && is_string($value)) {
             if (preg_match('/^%([^%]+)%$/', $value, $match)) {
diff --git a/src/Symfony/Component/DependencyInjection/Dumper/XmlDumper.php b/src/Symfony/Component/DependencyInjection/Dumper/XmlDumper.php
index 66d6c5dccb..38025ff3ea 100644
--- a/src/Symfony/Component/DependencyInjection/Dumper/XmlDumper.php
+++ b/src/Symfony/Component/DependencyInjection/Dumper/XmlDumper.php
@@ -158,7 +158,7 @@ class XmlDumper extends Dumper
         if ($callable = $definition->getConfigurator()) {
             $configurator = $this->document->createElement('configurator');
             if (is_array($callable)) {
-                $configurator->setAttribute((is_object($callable[0]) && $callable[0] instanceof Reference ? 'service' : 'class'), $callable[0]);
+                $configurator->setAttribute($callable[0] instanceof Reference ? 'service' : 'class', $callable[0]);
                 $configurator->setAttribute('method', $callable[1]);
             } else {
                 $configurator->setAttribute('function', $callable);
@@ -230,7 +230,7 @@ class XmlDumper extends Dumper
             if (is_array($value)) {
                 $element->setAttribute('type', 'collection');
                 $this->convertParameters($value, $type, $element, 'key');
-            } elseif (is_object($value) && $value instanceof Reference) {
+            } elseif ($value instanceof Reference) {
                 $element->setAttribute('type', 'service');
                 $element->setAttribute('id', (string) $value);
                 $behaviour = $value->getInvalidBehavior();
@@ -239,7 +239,7 @@ class XmlDumper extends Dumper
                 } elseif ($behaviour == ContainerInterface::IGNORE_ON_INVALID_REFERENCE) {
                     $element->setAttribute('on-invalid', 'ignore');
                 }
-            } elseif (is_object($value) && $value instanceof Definition) {
+            } elseif ($value instanceof Definition) {
                 $element->setAttribute('type', 'service');
                 $this->addService($value, null, $element);
             } else {
@@ -294,7 +294,7 @@ class XmlDumper extends Dumper
                 return 'true';
             case false === $value:
                 return 'false';
-            case is_object($value) && $value instanceof Parameter:
+            case $value instanceof Parameter:
                 return '%'.$value.'%';
             case is_object($value) || is_resource($value):
                 throw new RuntimeException('Unable to dump a service container if a parameter is an object or a resource.');
diff --git a/src/Symfony/Component/DependencyInjection/Dumper/YamlDumper.php b/src/Symfony/Component/DependencyInjection/Dumper/YamlDumper.php
index bd87161e3b..82d68008e0 100644
--- a/src/Symfony/Component/DependencyInjection/Dumper/YamlDumper.php
+++ b/src/Symfony/Component/DependencyInjection/Dumper/YamlDumper.php
@@ -120,7 +120,7 @@ class YamlDumper extends Dumper
 
         if ($callable = $definition->getConfigurator()) {
             if (is_array($callable)) {
-                if (is_object($callable[0]) && $callable[0] instanceof Reference) {
+                if ($callable[0] instanceof Reference) {
                     $callable = array($this->getServiceCall((string) $callable[0], $callable[0]), $callable[1]);
                 } else {
                     $callable = array($callable[0], $callable[1]);
@@ -211,9 +211,9 @@ class YamlDumper extends Dumper
             }
 
             return $code;
-        } elseif (is_object($value) && $value instanceof Reference) {
+        } elseif ($value instanceof Reference) {
             return $this->getServiceCall((string) $value, $value);
-        } elseif (is_object($value) && $value instanceof Parameter) {
+        } elseif ($value instanceof Parameter) {
             return $this->getParameterCall((string) $value);
         } elseif (is_object($value) || is_resource($value)) {
             throw new RuntimeException('Unable to dump a service container if a parameter is an object or a resource.');