diff --git a/src/Symfony/Bridge/Twig/Tests/Extension/DumpExtensionTest.php b/src/Symfony/Bridge/Twig/Tests/Extension/DumpExtensionTest.php
index 16361e3e5debc..05166bd29335f 100644
--- a/src/Symfony/Bridge/Twig/Tests/Extension/DumpExtensionTest.php
+++ b/src/Symfony/Bridge/Twig/Tests/Extension/DumpExtensionTest.php
@@ -13,7 +13,7 @@
 
 use Symfony\Bridge\Twig\Extension\DumpExtension;
 use Symfony\Component\VarDumper\VarDumper;
-use Symfony\Component\VarDumper\Cloner\PhpCloner;
+use Symfony\Component\VarDumper\Cloner\VarCloner;
 
 class DumpExtensionTest extends \PHPUnit_Framework_TestCase
 {
@@ -22,7 +22,7 @@ class DumpExtensionTest extends \PHPUnit_Framework_TestCase
      */
     public function testDumpTag($template, $debug, $expectedOutput, $expectedDumped)
     {
-        $extension = new DumpExtension(new PhpCloner());
+        $extension = new DumpExtension(new VarCloner());
         $twig = new \Twig_Environment(new \Twig_Loader_String(), array(
             'debug' => $debug,
             'cache' => false,
@@ -62,7 +62,7 @@ public function getDumpTags()
      */
     public function testDump($context, $args, $expectedOutput, $debug = true)
     {
-        $extension = new DumpExtension(new PhpCloner());
+        $extension = new DumpExtension(new VarCloner());
         $twig = new \Twig_Environment(new \Twig_Loader_String(), array(
             'debug' => $debug,
             'cache' => false,
@@ -77,7 +77,7 @@ public function testDump($context, $args, $expectedOutput, $debug = true)
         if ($debug) {
             $this->assertStringStartsWith('<script>', $dump);
             $dump = preg_replace('/^.*?<pre/', '<pre', $dump);
-            $dump = preg_replace('/sf-dump-\\d{2,}/', 'sf-dump', $dump);
+            $dump = preg_replace('/sf-dump-\d+/', 'sf-dump', $dump);
         }
         $this->assertEquals($expectedOutput, $dump);
     }
@@ -86,12 +86,12 @@ public function getDumpArgs()
     {
         return array(
             array(array(), array(), '', false),
-            array(array(), array(), "<pre class=sf-dump>[]\n</pre><script>Sfjs.dump.instrument()</script>\n"),
+            array(array(), array(), "<pre class=sf-dump>[]\n</pre><script>Sfdump.instrument()</script>\n"),
             array(
                 array(),
                 array(123, 456),
-                "<pre class=sf-dump><span class=sf-dump-num>123</span>\n</pre><script>Sfjs.dump.instrument()</script>\n"
-                ."<pre class=sf-dump><span class=sf-dump-num>456</span>\n</pre><script>Sfjs.dump.instrument()</script>\n",
+                "<pre class=sf-dump><span class=sf-dump-num>123</span>\n</pre><script>Sfdump.instrument()</script>\n"
+                ."<pre class=sf-dump><span class=sf-dump-num>456</span>\n</pre><script>Sfdump.instrument()</script>\n",
             ),
             array(
                 array('foo' => 'bar'),
@@ -99,7 +99,7 @@ public function getDumpArgs()
                 "<pre class=sf-dump><span class=sf-dump-note>array:1</span> [<span name=sf-dump-child>\n"
                 ."  \"<span class=sf-dump-meta>foo</span>\" => \"<span class=sf-dump-str>bar</span>\"\n"
                 ."</span>]\n"
-                ."</pre><script>Sfjs.dump.instrument()</script>\n",
+                ."</pre><script>Sfdump.instrument()</script>\n",
             ),
         );
     }
diff --git a/src/Symfony/Bundle/DebugBundle/DependencyInjection/DebugExtension.php b/src/Symfony/Bundle/DebugBundle/DependencyInjection/DebugExtension.php
index 4b136c89454b8..23e9d0c96c4c3 100644
--- a/src/Symfony/Bundle/DebugBundle/DependencyInjection/DebugExtension.php
+++ b/src/Symfony/Bundle/DebugBundle/DependencyInjection/DebugExtension.php
@@ -34,11 +34,6 @@ public function load(array $configs, ContainerBuilder $container)
         $loader = new XmlFileLoader($container, new FileLocator(__DIR__.'/../Resources/config'));
         $loader->load('services.xml');
 
-        $container->setParameter(
-            'var_dumper.cloner.class',
-            'Symfony\Component\VarDumper\Cloner\\'.(function_exists('symfony_zval_info') ? 'Ext' : 'Php').'Cloner'
-        );
-
         $container->getDefinition('var_dumper.cloner')
             ->addMethodCall('setMaxItems',  array($config['max_items']))
             ->addMethodCall('setMaxString', array($config['max_string_length']));
diff --git a/src/Symfony/Bundle/DebugBundle/Resources/config/services.xml b/src/Symfony/Bundle/DebugBundle/Resources/config/services.xml
index 290644c6d534a..0593cc7efa14d 100644
--- a/src/Symfony/Bundle/DebugBundle/Resources/config/services.xml
+++ b/src/Symfony/Bundle/DebugBundle/Resources/config/services.xml
@@ -4,25 +4,20 @@
     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
     xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">
 
-    <parameters>
-        <parameter key="data_collector.dump.class">Symfony\Component\HttpKernel\DataCollector\DumpDataCollector</parameter>
-        <parameter key="debug.dump_listener.class">Symfony\Component\HttpKernel\EventListener\DumpListener</parameter>
-    </parameters>
-
     <services>
-        <service id="data_collector.dump" class="%data_collector.dump.class%">
+        <service id="data_collector.dump" class="Symfony\Component\HttpKernel\DataCollector\DumpDataCollector">
             <tag name="data_collector" id="dump" template="@Debug/Profiler/dump.html.twig" />
             <argument type="service" id="debug.stopwatch" on-invalid="ignore" />
             <argument>%templating.helper.code.file_link_format%</argument>
         </service>
 
-        <service id="debug.dump_listener" class="%debug.dump_listener.class%">
+        <service id="debug.dump_listener" class="Symfony\Component\HttpKernel\EventListener\DumpListener">
             <tag name="kernel.event_subscriber" />
             <argument type="service" id="service_container" />
             <argument>data_collector.dump</argument>
         </service>
 
-        <service id="var_dumper.cloner" class="%var_dumper.cloner.class%" />
+        <service id="var_dumper.cloner" class="Symfony\Component\VarDumper\Cloner\VarCloner" />
     </services>
 
 </container>
diff --git a/src/Symfony/Bundle/DebugBundle/Resources/views/Profiler/dump.html.twig b/src/Symfony/Bundle/DebugBundle/Resources/views/Profiler/dump.html.twig
index b453928c04210..71f0082725895 100644
--- a/src/Symfony/Bundle/DebugBundle/Resources/views/Profiler/dump.html.twig
+++ b/src/Symfony/Bundle/DebugBundle/Resources/views/Profiler/dump.html.twig
@@ -84,7 +84,7 @@
                 {{ dump.name }}
             {% endif %}
             line {{ dump.line }}:
-            <a onclick="Sfjs.dump.toggle(this)">▶</a>
+            <a onclick="Sfdump.toggle(this)">▶</a>
             <span class="sf-dump-compact">
             {% if dump.fileExcerpt %}{{ dump.fileExcerpt|raw }}{% else %}{{ dump.file|file_excerpt(dump.line) }}{% endif %}
             </span>
diff --git a/src/Symfony/Bundle/TwigBundle/Resources/config/debug.xml b/src/Symfony/Bundle/TwigBundle/Resources/config/debug.xml
index 36ddc2a33d82a..70bdafa77cdb0 100644
--- a/src/Symfony/Bundle/TwigBundle/Resources/config/debug.xml
+++ b/src/Symfony/Bundle/TwigBundle/Resources/config/debug.xml
@@ -6,7 +6,6 @@
 
     <parameters>
         <parameter key="debug.templating.engine.twig.class">Symfony\Bundle\TwigBundle\Debug\TimedTwigEngine</parameter>
-        <parameter key="twig.extension.dump.class">Symfony\Bridge\Twig\Extension\DumpExtension</parameter>
     </parameters>
 
     <services>
@@ -17,7 +16,7 @@
             <argument type="service" id="debug.stopwatch" />
         </service>
 
-        <service id="twig.extension.dump" class="%twig.extension.dump.class%" public="false">
+        <service id="twig.extension.dump" class="Symfony\Bridge\Twig\Extension\DumpExtension" public="false">
             <tag name="twig.extension" />
             <argument type="service" id="var_dumper.cloner" on-invalid="null" />
         </service>
diff --git a/src/Symfony/Component/HttpKernel/Tests/DataCollector/DumpDataCollectorTest.php b/src/Symfony/Component/HttpKernel/Tests/DataCollector/DumpDataCollectorTest.php
index 5cfdba27d9e0d..5af2959c892e3 100644
--- a/src/Symfony/Component/HttpKernel/Tests/DataCollector/DumpDataCollectorTest.php
+++ b/src/Symfony/Component/HttpKernel/Tests/DataCollector/DumpDataCollectorTest.php
@@ -38,7 +38,7 @@ public function testDump()
 
         $xDump = array(
             array(
-                'data' => "<pre class=sf-dump><span class=sf-dump-num>123</span>\n</pre><script>Sfjs.dump.instrument()</script>\n",
+                'data' => "<pre class=sf-dump><span class=sf-dump-num>123</span>\n</pre><script>Sfdump.instrument()</script>\n",
                 'name' => 'DumpDataCollectorTest.php',
                 'file' => __FILE__,
                 'line' => $line,
diff --git a/src/Symfony/Component/VarDumper/Cloner/ExtCloner.php b/src/Symfony/Component/VarDumper/Cloner/ExtCloner.php
deleted file mode 100644
index cf1a0d19ea1c5..0000000000000
--- a/src/Symfony/Component/VarDumper/Cloner/ExtCloner.php
+++ /dev/null
@@ -1,201 +0,0 @@
-<?php
-
-/*
- * This file is part of the Symfony package.
- *
- * (c) Fabien Potencier <fabien@symfony.com>
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Symfony\Component\VarDumper\Cloner;
-
-/**
- * @author Nicolas Grekas <p@tchwork.com>
- */
-class ExtCloner extends AbstractCloner
-{
-    /**
-     * {@inheritdoc}
-     */
-    protected function doClone($var)
-    {
-        $i = 0;                         // Current iteration position in $queue
-        $len = 1;                       // Length of $queue
-        $pos = 0;                       // Number of cloned items past the first level
-        $refs = 0;                      // Number of hard+soft references in $var
-        $queue = array(array($var));    // This breadth-first queue is the return value
-        $arrayRefs = array();           // Map of queue indexes to stub array objects
-        $hardRefs = array();            // Map of original zval hashes to stub objects
-        $softRefs = array();            // Map of original object hashes to their stub object couterpart
-        $maxItems = $this->maxItems;
-        $maxString = $this->maxString;
-        $a = null;                      // Array cast for nested structures
-        $stub = null;                   // Stub capturing the main properties of an original item value,
-                                        // or null if the original value is used directly
-
-        for ($i = 0; $i < $len; ++$i) {
-            $indexed = true;            // Whether the currently iterated array is numerically indexed or not
-            $j = -1;                    // Position in the currently iterated array
-            $step = $queue[$i];         // Copy of the currently iterated array used for hard references detection
-            foreach ($step as $k => $v) {
-                // $k is the original key
-                // $v is the original value or a stub object in case of hard references
-                if ($indexed && $k !== ++$j) {
-                    $indexed = false;
-                }
-                $zval = symfony_zval_info($k, $step);
-                if ($zval['zval_isref']) {
-                    $queue[$i][$k] =& $stub;    // Break hard references to make $queue completely
-                    unset($stub);               // independent from the original structure
-                    if (isset($hardRefs[$h = $zval['zval_hash']])) {
-                        $hardRefs[$h]->ref = ++$refs;
-                        $queue[$i][$k] = $hardRefs[$h];
-                        continue;
-                    }
-                }
-                // Create $stub when the original value $v can not be used directly
-                // If $v is a nested structure, put that structure in array $a
-                switch ($zval['type']) {
-                    case 'string':
-                        if (isset($v[0]) && !preg_match('//u', $v)) {
-                            $stub = new Stub();
-                            $stub->type = Stub::TYPE_STRING;
-                            $stub->class = Stub::STRING_BINARY;
-                            if (0 <= $maxString && 0 < $cut = strlen($v) - $maxString) {
-                                $stub->cut = $cut;
-                                $v = substr_replace($v, '', -$cut);
-                            }
-                            $stub->value = Data::utf8Encode($v);
-                        } elseif (0 <= $maxString && isset($v[1+($maxString>>2)]) && 0 < $cut = iconv_strlen($v, 'UTF-8') - $maxString) {
-                            $stub = new Stub();
-                            $stub->type = Stub::TYPE_STRING;
-                            $stub->class = Stub::STRING_UTF8;
-                            $stub->cut = $cut;
-                            $stub->value = iconv_substr($v, 0, $maxString, 'UTF-8');
-                        }
-                        break;
-
-                    case 'integer':
-                        break;
-
-                    case 'array':
-                        if ($v) {
-                            $stub = $arrayRefs[$len] = new Stub();
-                            $stub->type = Stub::TYPE_ARRAY;
-                            $stub->class = Stub::ARRAY_ASSOC;
-                            $stub->value = $zval['array_count'];
-                            $a = $v;
-                        }
-                        break;
-
-                    case 'object':
-                        if (empty($softRefs[$h = $zval['object_hash']])) {
-                            $stub = new Stub();
-                            $stub->type = Stub::TYPE_OBJECT;
-                            $stub->class = $zval['object_class'];
-                            $stub->value = $v;
-                            $a = $this->castObject($stub, 0 < $i);
-                            if ($v !== $stub->value) {
-                                if (Stub::TYPE_OBJECT !== $stub->type) {
-                                    break;
-                                }
-                                $h = spl_object_hash($stub->value);
-                            }
-                            $stub->value = null;
-                            if (0 <= $maxItems && $maxItems <= $pos) {
-                                $stub->cut = count($a);
-                                $a = null;
-                            }
-                        }
-                        if (empty($softRefs[$h])) {
-                            $softRefs[$h] = $stub;
-                        } else {
-                            $stub = $softRefs[$h];
-                            $stub->ref = ++$refs;
-                            $a = null;
-                        }
-                        break;
-
-                    case 'resource':
-                        if (empty($softRefs[$h = (int) $v])) {
-                            $stub = new Stub();
-                            $stub->type = Stub::TYPE_RESOURCE;
-                            $stub->class = $zval['resource_type'];
-                            $stub->value = $v;
-                            $a = $this->castResource($stub, 0 < $i);
-                            if ($v !== $stub->value) {
-                                if (Stub::TYPE_RESOURCE !== $stub->type) {
-                                    break;
-                                }
-                                $h = (int) $stub->value;
-                            }
-                            $stub->value = null;
-                            if (0 <= $maxItems && $maxItems <= $pos) {
-                                $stub->cut = count($a);
-                                $a = null;
-                            }
-                        }
-                        if (empty($softRefs[$h])) {
-                            $softRefs[$h] = $stub;
-                        } else {
-                            $stub = $softRefs[$h];
-                            $stub->ref = ++$refs;
-                            $a = null;
-                        }
-                        break;
-                }
-
-                if (isset($stub)) {
-                    if ($zval['zval_isref']) {
-                        if (Stub::TYPE_ARRAY === $stub->type) {
-                            $queue[$i][$k] = $hardRefs[$zval['zval_hash']] = $stub;
-                        } else {
-                            $queue[$i][$k] = $hardRefs[$zval['zval_hash']] = $v = new Stub();
-                            $v->value = $stub;
-                        }
-                    } else {
-                        $queue[$i][$k] = $stub;
-                    }
-
-                    if ($a) {
-                        if ($i && 0 <= $maxItems) {
-                            $k = count($a);
-                            if ($pos < $maxItems) {
-                                if ($maxItems < $pos += $k) {
-                                    $a = array_slice($a, 0, $maxItems - $pos);
-                                    if ($stub->cut >= 0) {
-                                        $stub->cut += $pos - $maxItems;
-                                    }
-                                }
-                            } else {
-                                if ($stub->cut >= 0) {
-                                    $stub->cut += $k;
-                                }
-                                $stub = $a = null;
-                                unset($arrayRefs[$len]);
-                                continue;
-                            }
-                        }
-                        $queue[$len] = $a;
-                        $stub->position = $len++;
-                    }
-                    $stub = $a = null;
-                } elseif ($zval['zval_isref']) {
-                    $queue[$i][$k] = $hardRefs[$zval['zval_hash']] = new Stub();
-                    $queue[$i][$k]->value = $v;
-                }
-            }
-
-            if (isset($arrayRefs[$i])) {
-                if ($indexed) {
-                    $arrayRefs[$i]->class = Stub::ARRAY_INDEXED;
-                }
-                unset($arrayRefs[$i]);
-            }
-        }
-
-        return $queue;
-    }
-}
diff --git a/src/Symfony/Component/VarDumper/Cloner/PhpCloner.php b/src/Symfony/Component/VarDumper/Cloner/VarCloner.php
similarity index 68%
rename from src/Symfony/Component/VarDumper/Cloner/PhpCloner.php
rename to src/Symfony/Component/VarDumper/Cloner/VarCloner.php
index 3fdafff66746d..6d1a9ffd9531a 100644
--- a/src/Symfony/Component/VarDumper/Cloner/PhpCloner.php
+++ b/src/Symfony/Component/VarDumper/Cloner/VarCloner.php
@@ -14,29 +14,37 @@
 /**
  * @author Nicolas Grekas <p@tchwork.com>
  */
-class PhpCloner extends AbstractCloner
+class VarCloner extends AbstractCloner
 {
     /**
      * {@inheritdoc}
      */
     protected function doClone($var)
     {
+        $useExt = extension_loaded('symfony_debug');
         $i = 0;                         // Current iteration position in $queue
         $len = 1;                       // Length of $queue
         $pos = 0;                       // Number of cloned items past the first level
         $refs = 0;                      // Number of hard+soft references in $var
         $queue = array(array($var));    // This breadth-first queue is the return value
         $arrayRefs = array();           // Map of queue indexes to stub array objects
-        $hardRefs = array();            // By-ref map of stub objects' hashes to original hard `&` references
+        $hardRefs = array();            // Map of original zval hashes to stub objects
         $softRefs = array();            // Map of original object hashes to their stub object couterpart
         $values = array();              // Map of stub objects' hashes to original values
         $maxItems = $this->maxItems;
         $maxString = $this->maxString;
         $cookie = (object) array();     // Unique object used to detect hard references
-        $isRef = false;
         $a = null;                      // Array cast for nested structures
         $stub = null;                   // Stub capturing the main properties of an original item value,
                                         // or null if the original value is used directly
+        $zval = array(                  // Main properties of the current value
+            'type' => null,
+            'zval_isref' => null,
+            'array_count' => null,
+            'object_class' => null,
+            'object_hash' => null,
+            'resource_type' => null,
+        );
 
         for ($i = 0; $i < $len; ++$i) {
             $indexed = true;            // Whether the currently iterated array is numerically indexed or not
@@ -48,20 +56,33 @@ protected function doClone($var)
                 if ($indexed && $k !== ++$j) {
                     $indexed = false;
                 }
-                $step[$k] = $cookie;
-                if ($queue[$i][$k] === $cookie) {
-                    $queue[$i][$k] =& $stub;    // Break hard references to make $queue completely
-                    unset($stub);               // independent from the original structure
-                    if ($v instanceof Stub && isset($hardRefs[spl_object_hash($v)])) {
-                        $v->ref = ++$refs;
-                        $step[$k] = $queue[$i][$k] = $v;
-                        continue;
+                if ($useExt) {
+                    $zval = symfony_zval_info($k, $step);
+                    if ($zval['zval_isref']) {
+                        $queue[$i][$k] =& $stub;    // Break hard references to make $queue completely
+                        unset($stub);               // independent from the original structure
+                        if (isset($hardRefs[$h = $zval['zval_hash']])) {
+                            $hardRefs[$h]->ref = ++$refs;
+                            $queue[$i][$k] = $hardRefs[$h];
+                            continue;
+                        }
+                    }
+                } else {
+                    $step[$k] = $cookie;
+                    if ($zval['zval_isref'] = $queue[$i][$k] === $cookie) {
+                        $queue[$i][$k] =& $stub;    // Break hard references to make $queue completely
+                        unset($stub);               // independent from the original structure
+                        if ($v instanceof Stub && isset($hardRefs[spl_object_hash($v)])) {
+                            $v->ref = ++$refs;
+                            $step[$k] = $queue[$i][$k] = $v;
+                            continue;
+                        }
                     }
-                    $isRef = true;
+                    $zval['type'] = gettype($v);
                 }
                 // Create $stub when the original value $v can not be used directly
                 // If $v is a nested structure, put that structure in array $a
-                switch (gettype($v)) {
+                switch ($zval['type']) {
                     case 'string':
                         if (isset($v[0]) && !preg_match('//u', $v)) {
                             $stub = new Stub();
@@ -74,7 +95,7 @@ protected function doClone($var)
                                 $cut = $v;
                             }
                             $stub->value = Data::utf8Encode($cut);
-                        } elseif (0 <= $maxString && isset($v[1+($maxString>>2)]) && 0 < $cut = iconv_strlen($v, 'UTF-8') - $maxString) {
+                        } elseif (0 <= $maxString && isset($v[1 + ($maxString >> 2)]) && 0 < $cut = iconv_strlen($v, 'UTF-8') - $maxString) {
                             $stub = new Stub();
                             $stub->type = Stub::TYPE_STRING;
                             $stub->class = Stub::STRING_UTF8;
@@ -91,16 +112,16 @@ protected function doClone($var)
                             $stub = $arrayRefs[$len] = new Stub();
                             $stub->type = Stub::TYPE_ARRAY;
                             $stub->class = Stub::ARRAY_ASSOC;
-                            $stub->value = count($v);
+                            $stub->value = $v ? $zval['array_count'] ?: count($v) : 0;
                             $a = $v;
                         }
                         break;
 
                     case 'object':
-                        if (empty($softRefs[$h = spl_object_hash($v)])) {
+                        if (empty($softRefs[$h = $zval['object_hash'] ?: spl_object_hash($v)])) {
                             $stub = new Stub();
                             $stub->type = Stub::TYPE_OBJECT;
-                            $stub->class = get_class($v);
+                            $stub->class = $zval['object_class'] ?: get_class($v);
                             $stub->value = $v;
                             $a = $this->castObject($stub, 0 < $i);
                             if ($v !== $stub->value) {
@@ -129,7 +150,7 @@ protected function doClone($var)
                         if (empty($softRefs[$h = (int) $v])) {
                             $stub = new Stub();
                             $stub->type = Stub::TYPE_RESOURCE;
-                            $stub->class = get_resource_type($v);
+                            $stub->class = $zval['resource_type'] ?: get_resource_type($v);
                             $stub->value = $v;
                             $a = $this->castResource($stub, 0 < $i);
                             if ($v !== $stub->value) {
@@ -155,17 +176,25 @@ protected function doClone($var)
                 }
 
                 if (isset($stub)) {
-                    if ($isRef) {
-                        if (Stub::TYPE_ARRAY === $stub->type) {
-                            $step[$k] = $stub;
+                    if ($zval['zval_isref']) {
+                        if ($useExt) {
+                            if (Stub::TYPE_ARRAY === $stub->type) {
+                                $queue[$i][$k] = $hardRefs[$zval['zval_hash']] = $stub;
+                            } else {
+                                $queue[$i][$k] = $hardRefs[$zval['zval_hash']] = $v = new Stub();
+                                $v->value = $stub;
+                            }
                         } else {
-                            $step[$k] = new Stub();
-                            $step[$k]->value = $stub;
+                            if (Stub::TYPE_ARRAY === $stub->type) {
+                                $step[$k] = $stub;
+                            } else {
+                                $step[$k] = new Stub();
+                                $step[$k]->value = $stub;
+                            }
+                            $h = spl_object_hash($step[$k]);
+                            $queue[$i][$k] = $hardRefs[$h] =& $step[$k];
+                            $values[$h] = $v;
                         }
-                        $h = spl_object_hash($step[$k]);
-                        $queue[$i][$k] = $hardRefs[$h] =& $step[$k];
-                        $values[$h] = $v;
-                        $isRef = false;
                     } else {
                         $queue[$i][$k] = $stub;
                     }
@@ -193,13 +222,17 @@ protected function doClone($var)
                         $stub->position = $len++;
                     }
                     $stub = $a = null;
-                } elseif ($isRef) {
-                    $step[$k] = $queue[$i][$k] = new Stub();
-                    $step[$k]->value = $v;
-                    $h = spl_object_hash($step[$k]);
-                    $hardRefs[$h] =& $step[$k];
-                    $values[$h] = $v;
-                    $isRef = false;
+                } elseif ($zval['zval_isref']) {
+                    if ($useExt) {
+                        $queue[$i][$k] = $hardRefs[$zval['zval_hash']] = new Stub();
+                        $queue[$i][$k]->value = $v;
+                    } else {
+                        $step[$k] = $queue[$i][$k] = new Stub();
+                        $step[$k]->value = $v;
+                        $h = spl_object_hash($step[$k]);
+                        $hardRefs[$h] =& $step[$k];
+                        $values[$h] = $v;
+                    }
                 }
             }
 
diff --git a/src/Symfony/Component/VarDumper/Dumper/HtmlDumper.php b/src/Symfony/Component/VarDumper/Dumper/HtmlDumper.php
index b8bb8192f9b17..b6093fa14ed27 100644
--- a/src/Symfony/Component/VarDumper/Dumper/HtmlDumper.php
+++ b/src/Symfony/Component/VarDumper/Dumper/HtmlDumper.php
@@ -25,7 +25,7 @@ class HtmlDumper extends CliDumper
 
     protected $dumpHeader;
     protected $dumpPrefix = '<pre class=sf-dump>';
-    protected $dumpSuffix = '</pre><script>Sfjs.dump.instrument()</script>';
+    protected $dumpSuffix = '</pre><script>Sfdump.instrument()</script>';
     protected $dumpId = 'sf-dump';
     protected $colors = true;
     protected $headerIsDumped = false;
@@ -106,17 +106,16 @@ protected function getDumpHeader()
 
         $line = <<<'EOHTML'
 <script>
-Sfjs = window.Sfjs || {};
-Sfjs.dump = Sfjs.dump || {};
-Sfjs.dump.childElts = Sfjs.dump.childElts || document.getElementsByName('sf-dump-child');
-Sfjs.dump.childLen = Sfjs.dump.childLen || 0;
-Sfjs.dump.refElts = Sfjs.dump.refElts || document.getElementsByName('sf-dump-ref');
-Sfjs.dump.refLen = Sfjs.dump.refLen || 0;
-if (!Sfjs.dump.refStyle) {
-    Sfjs.dump.refStyle = document.createElement('style');
-    document.documentElement.firstChild.appendChild(Sfjs.dump.refStyle);
+Sfdump = window.Sfdump || {};
+Sfdump.childElts = Sfdump.childElts || document.getElementsByName('sf-dump-child');
+Sfdump.childLen = Sfdump.childLen || 0;
+Sfdump.refElts = Sfdump.refElts || document.getElementsByName('sf-dump-ref');
+Sfdump.refLen = Sfdump.refLen || 0;
+if (!Sfdump.refStyle) {
+    Sfdump.refStyle = document.createElement('style');
+    document.documentElement.firstChild.appendChild(Sfdump.refStyle);
 }
-Sfjs.dump.instrument = Sfjs.dump.instrument || function () {
+Sfdump.instrument = Sfdump.instrument || function () {
     var elt, i, ref;
 
     i = this.childLen;
@@ -126,13 +125,13 @@ protected function getDumpHeader()
         elt = this.childElts[i];
         if ("" == elt.className) {
             elt.className = "sf-dump-child";
-            elt.innerHTML = '<a class=sf-dump-ref onclick="Sfjs.dump.toggle(this)"><span>▼</span></a><span class="sf-dump-expanded">'+elt.innerHTML+'</span>';
+            elt.innerHTML = '<a class=sf-dump-ref onclick="Sfdump.toggle(this)"><span>▼</span></a><span class="sf-dump-expanded">'+elt.innerHTML+'</span>';
             if ('sf-dump-expanded' == elt.parentNode.className) {
                 if (elt.children[1].firstChild.nextSibling.id) {
                     elt.firstChild.appendChild(elt.children[1].firstChild);
                     elt.firstChild.appendChild(elt.children[1].firstChild);
                 }
-                Sfjs.dump.toggle(elt.firstChild);
+                Sfdump.toggle(elt.firstChild);
             }
         }
         ++i;
@@ -157,11 +156,11 @@ function instrumentRef(elt) {
                         try {
                             t.replaceChild(r, elt);
                             f.replaceChild(elt, c);
-                            Sfjs.dump.refStyle.innerHTML = '';
+                            Sfdump.refStyle.innerHTML = '';
                             r = r.firstChild;
                             c = r.nextSibling;
                             if ('sf-dump-compact' == c.className) {
-                                Sfjs.dump.toggle(r);
+                                Sfdump.toggle(r);
                             }
 
                             return false;
@@ -174,10 +173,10 @@ function instrumentRef(elt) {
         }
         elt.className += ' '+ref;
         elt.onmouseover = function() {
-            Sfjs.dump.refStyle.innerHTML = 'pre.sf-dump .'+ref+'{background-color: yellow; border-radius: 2px}';
+            Sfdump.refStyle.innerHTML = 'pre.sf-dump .'+ref+'{background-color: yellow; border-radius: 2px}';
         };
         elt.onmouseout = function() {
-            Sfjs.dump.refStyle.innerHTML = '';
+            Sfdump.refStyle.innerHTML = '';
         };
     }
 
@@ -189,7 +188,7 @@ function instrumentRef(elt) {
         ++i;
     }
 };
-Sfjs.dump.toggle = Sfjs.dump.toggle || function(a) {
+Sfdump.toggle = Sfdump.toggle || function(a) {
     var s = a.nextElementSibling;
 
     if ('sf-dump-compact' == s.className) {
diff --git a/src/Symfony/Component/VarDumper/Tests/CliDumperTest.php b/src/Symfony/Component/VarDumper/Tests/CliDumperTest.php
index ac357d546942e..de43e088d678c 100644
--- a/src/Symfony/Component/VarDumper/Tests/CliDumperTest.php
+++ b/src/Symfony/Component/VarDumper/Tests/CliDumperTest.php
@@ -11,7 +11,7 @@
 
 namespace Symfony\Component\VarDumper\Tests;
 
-use Symfony\Component\VarDumper\Cloner\PhpCloner;
+use Symfony\Component\VarDumper\Cloner\VarCloner;
 use Symfony\Component\VarDumper\Dumper\CliDumper;
 
 /**
@@ -25,13 +25,13 @@ public function testGet()
 
         $dumper = new CliDumper('php://output');
         $dumper->setColors(false);
-        $cloner = new PhpCloner();
+        $cloner = new VarCloner();
         $cloner->addCasters(array(
             ':stream' => function ($res, $a) {
                 unset($a['uri']);
 
                 return $a;
-            }
+            },
         ));
         $data = $cloner->cloneVar($var);
 
diff --git a/src/Symfony/Component/VarDumper/Tests/HtmlDumperTest.php b/src/Symfony/Component/VarDumper/Tests/HtmlDumperTest.php
index e8265599bd21e..5842b9bcdc43e 100644
--- a/src/Symfony/Component/VarDumper/Tests/HtmlDumperTest.php
+++ b/src/Symfony/Component/VarDumper/Tests/HtmlDumperTest.php
@@ -11,7 +11,7 @@
 
 namespace Symfony\Component\VarDumper\Tests;
 
-use Symfony\Component\VarDumper\Cloner\PhpCloner;
+use Symfony\Component\VarDumper\Cloner\VarCloner;
 use Symfony\Component\VarDumper\Dumper\HtmlDumper;
 
 /**
@@ -27,7 +27,7 @@ public function testGet()
         $dumper->setColors(false);
         $dumper->setDumpHeader('<foo></foo>');
         $dumper->setDumpBoundaries('<bar>', '</bar>');
-        $cloner = new PhpCloner();
+        $cloner = new VarCloner();
         $cloner->addCasters(array(
             ':stream' => function ($res, $a) {
                 unset($a['uri']);
diff --git a/src/Symfony/Component/VarDumper/VarDumper.php b/src/Symfony/Component/VarDumper/VarDumper.php
index b92f5bafd2cf6..3a1b23be3ad90 100644
--- a/src/Symfony/Component/VarDumper/VarDumper.php
+++ b/src/Symfony/Component/VarDumper/VarDumper.php
@@ -11,8 +11,7 @@
 
 namespace Symfony\Component\VarDumper;
 
-use Symfony\Component\VarDumper\Cloner\ExtCloner;
-use Symfony\Component\VarDumper\Cloner\PhpCloner;
+use Symfony\Component\VarDumper\Cloner\VarCloner;
 use Symfony\Component\VarDumper\Dumper\CliDumper;
 use Symfony\Component\VarDumper\Dumper\HtmlDumper;
 
@@ -26,7 +25,7 @@ class VarDumper
     public static function dump($var)
     {
         if (null === self::$handler) {
-            $cloner = extension_loaded('symfony_debug') ? new ExtCloner() : new PhpCloner();
+            $cloner = new VarCloner();
             $dumper = 'cli' === PHP_SAPI ? new CliDumper() : new HtmlDumper();
             self::$handler = function ($var) use ($cloner, $dumper) {
                 $dumper->dump($cloner->cloneVar($var));