diff --git a/book/doctrine.rst b/book/doctrine.rst
index 7ecd592ef63..5f842454f7c 100644
--- a/book/doctrine.rst
+++ b/book/doctrine.rst
@@ -1199,7 +1199,7 @@ to the given ``Category`` object via their ``category_id`` value.
         $category = $product->getCategory();
 
         // prints "Proxies\AppBundleEntityCategoryProxy"
-        echo get_class($category);
+        dump(get_class($category));
 
     This proxy object extends the true ``Category`` object, and looks and
     acts exactly like it. The difference is that, by using a proxy object,
diff --git a/book/translation.rst b/book/translation.rst
index 579150646bf..7b3247ae583 100644
--- a/book/translation.rst
+++ b/book/translation.rst
@@ -12,11 +12,11 @@ wrapping each with a function capable of translating the text (or "message")
 into the language of the user::
 
     // text will *always* print out in English
-    echo 'Hello World';
+    dump('Hello World');
 
     // text can be translated into the end-user's language or
     // default to English
-    echo $translator->trans('Hello World');
+    dump($translator->trans('Hello World'));
 
 .. note::
 
diff --git a/components/class_loader/class_map_generator.rst b/components/class_loader/class_map_generator.rst
index faf06e88809..b35aa731824 100644
--- a/components/class_loader/class_map_generator.rst
+++ b/components/class_loader/class_map_generator.rst
@@ -50,7 +50,7 @@ method::
 
     use Symfony\Component\ClassLoader\ClassMapGenerator;
 
-    print_r(ClassMapGenerator::createMap(__DIR__.'/library'));
+    dump(ClassMapGenerator::createMap(__DIR__.'/library'));
 
 Given the files and class from the table above, you should see an output like
 this:
diff --git a/components/css_selector.rst b/components/css_selector.rst
index 2eaf063169c..62be28c88e9 100644
--- a/components/css_selector.rst
+++ b/components/css_selector.rst
@@ -49,7 +49,7 @@ equivalents::
 
     use Symfony\Component\CssSelector\CssSelector;
 
-    print CssSelector::toXPath('div.item > h4 > a');
+    dump(CssSelector::toXPath('div.item > h4 > a'));
 
 This gives the following output:
 
diff --git a/components/dom_crawler.rst b/components/dom_crawler.rst
index c9809e28331..64b6630f9ed 100644
--- a/components/dom_crawler.rst
+++ b/components/dom_crawler.rst
@@ -45,7 +45,7 @@ traverse easily::
     $crawler = new Crawler($html);
 
     foreach ($crawler as $domElement) {
-        print $domElement->nodeName;
+        dump($domElement->nodeName);
     }
 
 Specialized :class:`Symfony\\Component\\DomCrawler\\Link` and
diff --git a/components/event_dispatcher/generic_event.rst b/components/event_dispatcher/generic_event.rst
index 3be0b9bb876..73ade2a1c8e 100644
--- a/components/event_dispatcher/generic_event.rst
+++ b/components/event_dispatcher/generic_event.rst
@@ -75,7 +75,7 @@ the event arguments::
     );
     $dispatcher->dispatch('foo', $event);
 
-    echo $event['counter'];
+    dump($event['counter']);
 
     class FooListener
     {
@@ -96,7 +96,7 @@ Filtering data::
     $event = new GenericEvent($subject, array('data' => 'Foo'));
     $dispatcher->dispatch('foo', $event);
 
-    echo $event['data'];
+    dump($event['data']);
 
     class FooListener
     {
@@ -105,3 +105,4 @@ Filtering data::
             $event['data'] = strtolower($event['data']);
         }
     }
+
diff --git a/components/event_dispatcher/introduction.rst b/components/event_dispatcher/introduction.rst
index a106834b965..c951c6f5016 100644
--- a/components/event_dispatcher/introduction.rst
+++ b/components/event_dispatcher/introduction.rst
@@ -636,7 +636,7 @@ dispatched, are passed as arguments to the listener::
     {
         public function myEventListener(Event $event, $eventName, EventDispatcherInterface $dispatcher)
         {
-            echo $eventName;
+            // ... do something with the event name
         }
     }
 
diff --git a/components/expression_language/caching.rst b/components/expression_language/caching.rst
index f7de6fb9066..7b36ce4163d 100644
--- a/components/expression_language/caching.rst
+++ b/components/expression_language/caching.rst
@@ -56,7 +56,7 @@ Both ``evaluate()`` and ``compile()`` can handle ``ParsedExpression`` and
     // the parse() method returns a ParsedExpression
     $expression = $language->parse('1 + 4', array());
 
-    echo $language->evaluate($expression); // prints 5
+    dump($language->evaluate($expression)); // prints 5
 
 .. code-block:: php
 
@@ -68,7 +68,7 @@ Both ``evaluate()`` and ``compile()`` can handle ``ParsedExpression`` and
         serialize($language->parse('1 + 4', array()))
     );
 
-    echo $language->evaluate($expression); // prints 5
+    dump($language->evaluate($expression)); // prints 5
 
 .. _DoctrineBridge: https://github.com/symfony/DoctrineBridge
 .. _`doctrine cache library`: http://docs.doctrine-project.org/projects/doctrine-common/en/latest/reference/caching.html
diff --git a/components/expression_language/extending.rst b/components/expression_language/extending.rst
index 4aded7c5aeb..16708a2a5a8 100644
--- a/components/expression_language/extending.rst
+++ b/components/expression_language/extending.rst
@@ -44,7 +44,7 @@ This method has 3 arguments:
         return strtolower($str);
     });
 
-    echo $language->evaluate('lowercase("HELLO")');
+    dump($language->evaluate('lowercase("HELLO")'));
 
 This will print ``hello``. Both the **compiler** and **evaluator** are passed
 an ``arguments`` variable as their first argument, which is equal to the
@@ -126,3 +126,4 @@ or by using the second argument of the constructor::
                 parent::__construct($parser, $providers);
             }
         }
+
diff --git a/components/expression_language/introduction.rst b/components/expression_language/introduction.rst
index b14e37d5504..7ed8c179639 100644
--- a/components/expression_language/introduction.rst
+++ b/components/expression_language/introduction.rst
@@ -68,9 +68,9 @@ The main class of the component is
 
     $language = new ExpressionLanguage();
 
-    echo $language->evaluate('1 + 2'); // displays 3
+    dump($language->evaluate('1 + 2')); // displays 3
 
-    echo $language->compile('1 + 2'); // displays (1 + 2)
+    dump($language->compile('1 + 2')); // displays (1 + 2)
 
 Expression Syntax
 -----------------
@@ -96,12 +96,12 @@ PHP type (including objects)::
     $apple = new Apple();
     $apple->variety = 'Honeycrisp';
 
-    echo $language->evaluate(
+    dump($language->evaluate(
         'fruit.variety',
         array(
             'fruit' => $apple,
         )
-    );
+    ));
 
 This will print "Honeycrisp". For more information, see the :doc:`/components/expression_language/syntax`
 entry, especially :ref:`component-expression-objects` and :ref:`component-expression-arrays`.
diff --git a/components/expression_language/syntax.rst b/components/expression_language/syntax.rst
index 56ec1da1173..7766ee075ec 100644
--- a/components/expression_language/syntax.rst
+++ b/components/expression_language/syntax.rst
@@ -42,12 +42,12 @@ to JavaScript::
     $apple = new Apple();
     $apple->variety = 'Honeycrisp';
 
-    echo $language->evaluate(
+    dump($language->evaluate(
         'fruit.variety',
         array(
             'fruit' => $apple,
         )
-    );
+    ));
 
 This will print out ``Honeycrisp``.
 
@@ -72,12 +72,12 @@ JavaScript::
 
     $robot = new Robot();
 
-    echo $language->evaluate(
+    dump($language->evaluate(
         'robot.sayHi(3)',
         array(
             'robot' => $robot,
         )
-    );
+    ));
 
 This will print out ``Hi Hi Hi!``.
 
@@ -93,9 +93,9 @@ constant::
 
     define('DB_USER', 'root');
 
-    echo $language->evaluate(
+    dump($language->evaluate(
         'constant("DB_USER")'
-    );
+    ));
 
 This will print out ``root``.
 
@@ -114,12 +114,12 @@ array keys, similar to JavaScript::
 
     $data = array('life' => 10, 'universe' => 10, 'everything' => 22);
 
-    echo $language->evaluate(
+    dump($language->evaluate(
         'data["life"] + data["universe"] + data["everything"]',
         array(
             'data' => $data,
         )
-    );
+    ));
 
 This will print out ``42``.
 
@@ -140,14 +140,14 @@ Arithmetic Operators
 
 For example::
 
-    echo $language->evaluate(
+    dump($language->evaluate(
         'life + universe + everything',
         array(
             'life' => 10,
             'universe' => 10,
             'everything' => 22,
         )
-    );
+    ));
 
 This will print out ``42``.
 
@@ -230,13 +230,13 @@ String Operators
 
 For example::
 
-    echo $language->evaluate(
+    dump($language->evaluate(
         'firstName~" "~lastName',
         array(
             'firstName' => 'Arthur',
             'lastName' => 'Dent',
         )
-    );
+    ));
 
 This would print out ``Arthur Dent``.
 
diff --git a/components/finder.rst b/components/finder.rst
index f3e8d5e8310..7abc705eb4f 100644
--- a/components/finder.rst
+++ b/components/finder.rst
@@ -28,14 +28,14 @@ directories::
     $finder->files()->in(__DIR__);
 
     foreach ($finder as $file) {
-        // Print the absolute path
-        print $file->getRealpath()."\n";
+        // Dump the absolute path
+        dump($file->getRealpath());
 
-        // Print the relative path to the file, omitting the filename
-        print $file->getRelativePath()."\n";
+        // Dump the relative path to the file, omitting the filename
+        dump($file->getRelativePath());
 
-        // Print the relative path to the file
-        print $file->getRelativePathname()."\n";
+        // Dump the relative path to the file
+        dump($file->getRelativePathname());
     }
 
 The ``$file`` is an instance of :class:`Symfony\\Component\\Finder\\SplFileInfo`
@@ -116,9 +116,7 @@ And it also works with user-defined streams::
     $finder = new Finder();
     $finder->name('photos*')->size('< 100K')->date('since 1 hour ago');
     foreach ($finder->in('s3://bucket-name') as $file) {
-        // ... do something
-
-        print $file->getFilename()."\n";
+        // ... do something with the file
     }
 
 .. note::
diff --git a/components/form/introduction.rst b/components/form/introduction.rst
index fae4de63540..5e1839543b4 100644
--- a/components/form/introduction.rst
+++ b/components/form/introduction.rst
@@ -394,9 +394,9 @@ is created from the form factory.
             ->add('dueDate', 'date')
             ->getForm();
 
-        echo $twig->render('new.html.twig', array(
+        dump($twig->render('new.html.twig', array(
             'form' => $form->createView(),
-        ));
+        )));
 
     .. code-block:: php-symfony
 
diff --git a/components/http_foundation/introduction.rst b/components/http_foundation/introduction.rst
index 73187523f3f..551ae331172 100644
--- a/components/http_foundation/introduction.rst
+++ b/components/http_foundation/introduction.rst
@@ -447,10 +447,10 @@ represented by a PHP callable instead of a string::
 
     $response = new StreamedResponse();
     $response->setCallback(function () {
-        echo 'Hello World';
+        dump('Hello World');
         flush();
         sleep(2);
-        echo 'Hello World';
+        dump('Hello World');
         flush();
     });
     $response->send();
diff --git a/components/intl.rst b/components/intl.rst
index c638f8bd2f6..4adc9277bf3 100644
--- a/components/intl.rst
+++ b/components/intl.rst
@@ -138,7 +138,7 @@ This class currently only works with the `intl extension`_ installed::
     $reader = new BinaryBundleReader();
     $data = $reader->read('/path/to/bundle', 'en');
 
-    echo $data['Data']['entry1'];
+    dump($data['Data']['entry1']);
 
 PhpBundleReader
 ~~~~~~~~~~~~~~~
@@ -152,7 +152,7 @@ object::
     $reader = new PhpBundleReader();
     $data = $reader->read('/path/to/bundle', 'en');
 
-    echo $data['Data']['entry1'];
+    dump($data['Data']['entry1']);
 
 BufferedBundleReader
 ~~~~~~~~~~~~~~~~~~~~
@@ -193,10 +193,10 @@ returned::
     $data = $reader->read('/path/to/bundle', 'en');
 
     // Produces an error if the key "Data" does not exist
-    echo $data['Data']['entry1'];
+    dump($data['Data']['entry1']);
 
     // Returns null if the key "Data" does not exist
-    echo $reader->readEntry('/path/to/bundle', 'en', array('Data', 'entry1'));
+    dump($reader->readEntry('/path/to/bundle', 'en', array('Data', 'entry1')));
 
 Additionally, the
 :method:`Symfony\\Component\\Intl\\ResourceBundle\\Reader\\StructuredBundleReaderInterface::readEntry`
@@ -207,12 +207,12 @@ multi-valued entries (arrays), the values of the more specific and the fallback
 locale will be merged. In order to suppress this behavior, the last parameter
 ``$fallback`` can be set to ``false``::
 
-    echo $reader->readEntry(
+    dump($reader->readEntry(
         '/path/to/bundle',
         'en',
         array('Data', 'entry1'),
         false
-    );
+    ));
 
 Accessing ICU Data
 ------------------
diff --git a/components/property_access/introduction.rst b/components/property_access/introduction.rst
index d8d4c774610..1e08ad30d6c 100644
--- a/components/property_access/introduction.rst
+++ b/components/property_access/introduction.rst
@@ -45,8 +45,8 @@ method. This is done using the index notation that is used in PHP::
         'first_name' => 'Wouter',
     );
 
-    echo $accessor->getValue($person, '[first_name]'); // 'Wouter'
-    echo $accessor->getValue($person, '[age]'); // null
+    dump($accessor->getValue($person, '[first_name]')); // 'Wouter'
+    dump($accessor->getValue($person, '[age]')); // null
 
 As you can see, the method will return ``null`` if the index does not exists.
 
@@ -62,8 +62,8 @@ You can also use multi dimensional arrays::
         )
     );
 
-    echo $accessor->getValue($persons, '[0][first_name]'); // 'Wouter'
-    echo $accessor->getValue($persons, '[1][first_name]'); // 'Ryan'
+    dump($accessor->getValue($persons, '[0][first_name]')); // 'Wouter'
+    dump($accessor->getValue($persons, '[1][first_name]')); // 'Ryan'
 
 Reading from Objects
 --------------------
@@ -80,13 +80,13 @@ To read from properties, use the "dot" notation::
     $person = new Person();
     $person->firstName = 'Wouter';
 
-    echo $accessor->getValue($person, 'firstName'); // 'Wouter'
+    dump($accessor->getValue($person, 'firstName')); // 'Wouter'
 
     $child = new Person();
     $child->firstName = 'Bar';
     $person->children = array($child);
 
-    echo $accessor->getValue($person, 'children[0].firstName'); // 'Bar'
+    dump($accessor->getValue($person, 'children[0].firstName')); // 'Bar'
 
 .. caution::
 
@@ -116,7 +116,7 @@ property name (``first_name`` becomes ``FirstName``) and prefixes it with
 
     $person = new Person();
 
-    echo $accessor->getValue($person, 'first_name'); // 'Wouter'
+    dump($accessor->getValue($person, 'first_name')); // 'Wouter'
 
 Using Hassers/Issers
 ~~~~~~~~~~~~~~~~~~~~
@@ -145,10 +145,10 @@ getters, this means that you can do something like this::
     $person = new Person();
 
     if ($accessor->getValue($person, 'author')) {
-        echo 'He is an author';
+        dump('He is an author');
     }
     if ($accessor->getValue($person, 'children')) {
-        echo 'He has children';
+        dump('He has children');
     }
 
 This will produce: ``He is an author``
@@ -173,7 +173,7 @@ The ``getValue`` method can also use the magic ``__get`` method::
 
     $person = new Person();
 
-    echo $accessor->getValue($person, 'Wouter'); // array(...)
+    dump($accessor->getValue($person, 'Wouter')); // array(...)
 
 .. _components-property-access-magic-call:
 
@@ -211,7 +211,7 @@ enable this feature by using :class:`Symfony\\Component\\PropertyAccess\\Propert
         ->enableMagicCall()
         ->getPropertyAccessor();
 
-    echo $accessor->getValue($person, 'wouter'); // array(...)
+    dump($accessor->getValue($person, 'wouter')); // array(...)
 
 .. versionadded:: 2.3
     The use of magic ``__call()`` method was introduced in Symfony 2.3.
@@ -235,9 +235,9 @@ method::
 
     $accessor->setValue($person, '[first_name]', 'Wouter');
 
-    echo $accessor->getValue($person, '[first_name]'); // 'Wouter'
+    dump($accessor->getValue($person, '[first_name]')); // 'Wouter'
     // or
-    // echo $person['first_name']; // 'Wouter'
+    // dump($person['first_name']); // 'Wouter'
 
 Writing to Objects
 ------------------
@@ -271,9 +271,9 @@ can use setters, the magic ``__set`` method or properties to set values::
     $accessor->setValue($person, 'lastName', 'de Jong');
     $accessor->setValue($person, 'children', array(new Person()));
 
-    echo $person->firstName; // 'Wouter'
-    echo $person->getLastName(); // 'de Jong'
-    echo $person->children; // array(Person());
+    dump($person->firstName); // 'Wouter'
+    dump($person->getLastName()); // 'de Jong'
+    dump($person->children); // array(Person());
 
 You can also use ``__call`` to set values but you need to enable the feature,
 see `Enable other Features`_.
@@ -309,7 +309,7 @@ see `Enable other Features`_.
 
     $accessor->setValue($person, 'wouter', array(...));
 
-    echo $person->getWouter(); // array(...)
+    dump($person->getWouter()); // array(...)
 
 Checking Property Paths
 -----------------------
@@ -374,7 +374,7 @@ You can also mix objects and arrays::
     $accessor->setValue($person, 'children[0].firstName', 'Wouter');
     // equal to $person->getChildren()[0]->firstName = 'Wouter'
 
-    echo 'Hello '.$accessor->getValue($person, 'children[0].firstName'); // 'Wouter'
+    dump('Hello '.$accessor->getValue($person, 'children[0].firstName')); // 'Wouter'
     // equal to $person->getChildren()[0]->firstName
 
 Enable other Features
diff --git a/components/security/authorization.rst b/components/security/authorization.rst
index 17d51b6e998..c8651e76391 100644
--- a/components/security/authorization.rst
+++ b/components/security/authorization.rst
@@ -191,8 +191,8 @@ first constructor argument::
 
     $role = new Role('ROLE_ADMIN');
 
-    // will echo 'ROLE_ADMIN'
-    echo $role->getRole();
+    // will show 'ROLE_ADMIN'
+    dump($role->getRole());
 
 .. note::
 
@@ -253,3 +253,4 @@ decision manager::
     if (!$authorizationChecker->isGranted('ROLE_ADMIN')) {
         throw new AccessDeniedException();
     }
+
diff --git a/components/serializer.rst b/components/serializer.rst
index 7a4bd7006a3..55f563f5314 100644
--- a/components/serializer.rst
+++ b/components/serializer.rst
@@ -358,7 +358,7 @@ having unique identifiers::
     });
 
     $serializer = new Serializer(array($normalizer), array($encoder));
-    echo $serializer->serialize($org, 'json');
+    dump($serializer->serialize($org, 'json'));
     // {"name":"Les-Tilleuls.coop","members":[{"name":"K\u00e9vin", organization: "Les-Tilleuls.coop"}]}
 
 JMSSerializer
diff --git a/components/translation/custom_formats.rst b/components/translation/custom_formats.rst
index 4378d249f86..793d118c549 100644
--- a/components/translation/custom_formats.rst
+++ b/components/translation/custom_formats.rst
@@ -63,7 +63,7 @@ Once created, it can be used as any other loader::
 
     $translator->addResource('my_format', __DIR__.'/translations/messages.txt', 'fr_FR');
 
-    echo $translator->trans('welcome');
+    dump($translator->trans('welcome'));
 
 It will print *"accueil"*.
 
@@ -116,3 +116,4 @@ YAML file are dumped into a text file with the custom format::
 
     $dumper = new MyFormatDumper();
     $dumper->dump($catalogue, array('path' => __DIR__.'/dumps'));
+
diff --git a/components/translation/usage.rst b/components/translation/usage.rst
index 4ccd2c3e868..6dad3147b0e 100644
--- a/components/translation/usage.rst
+++ b/components/translation/usage.rst
@@ -15,7 +15,7 @@ Imagine you want to translate the string *"Symfony is great"* into French::
         'Symfony is great!' => 'J\'aime Symfony!',
     ), 'fr_FR');
 
-    echo $translator->trans('Symfony is great!');
+    dump($translator->trans('Symfony is great!'));
 
 In this example, the message *"Symfony is great!"* will be translated into
 the locale set in the constructor (``fr_FR``) if the message exists in one of
@@ -31,7 +31,7 @@ Sometimes, a message containing a variable needs to be translated::
     // ...
     $translated = $translator->trans('Hello '.$name);
 
-    echo $translated;
+    dump($translated);
 
 However, creating a translation for this string is impossible since the translator
 will try to look up the exact message, including the variable portions
@@ -45,7 +45,7 @@ variable with a "placeholder"::
         array('%name%' => $name)
     );
 
-    echo $translated;
+    dump($translated);
 
 Symfony will now look for a translation of the raw message (``Hello %name%``)
 and *then* replace the placeholders with their values. Creating a translation
@@ -392,3 +392,4 @@ The ``$messages`` variable will have the following structure::
             'Value is too long' => 'Valeur est trop long',
         ),
     );
+
diff --git a/cookbook/bundles/remove.rst b/cookbook/bundles/remove.rst
index 407ee421aa4..2cc87decf61 100644
--- a/cookbook/bundles/remove.rst
+++ b/cookbook/bundles/remove.rst
@@ -79,7 +79,7 @@ can remove the ``Acme`` directory as well.
     :method:`Symfony\\Component\\HttpKernel\\Bundle\\BundleInterface::getPath` method
     to get the path of the bundle::
 
-        echo $this->container->get('kernel')->getBundle('AcmeDemoBundle')->getPath();
+        dump($this->container->get('kernel')->getBundle('AcmeDemoBundle')->getPath());
 
 3.1 Remove Bundle Assets
 ~~~~~~~~~~~~~~~~~~~~~~~~