Removed no longer needed information about PHP 5.3

Author: wouterj

book/controller.rst

@@ -116,7 +116,7 @@ Controllers are also called *actions*.
 
 This controller is pretty straightforward:
 
-* *line 4*: Symfony takes advantage of PHP 5.3 namespace functionality to
+* *line 4*: Symfony takes advantage of PHP's namespace functionality to
   namespace the entire controller class. The ``use`` keyword imports the
   ``Response`` class, which the controller must return.
 
@@ -556,7 +556,7 @@ Symfony will automatically return a 500 HTTP response code.
     throw new \Exception('Something went wrong!');
 
 In every case, an error page is shown to the end user and a full debug
-error page is shown to the developer (i.e. when you're using ``app_dev.php`` - 
+error page is shown to the developer (i.e. when you're using ``app_dev.php`` -
 see :ref:`page-creation-environments`).
 
 You'll want to customize the error page your user sees. To do that, see the

cookbook/bundles/best_practices.rst

@@ -29,10 +29,9 @@ Bundle Name
 -----------
 
 A bundle is also a PHP namespace. The namespace must follow the technical
-interoperability `standards`_ for PHP 5.3 namespaces and class names: it
-starts with a vendor segment, followed by zero or more category segments, and
-it ends with the namespace short name, which must end with a ``Bundle``
-suffix.
+interoperability `standards`_ for PHP namespaces and class names: it starts
+with a vendor segment, followed by zero or more category segments, and it ends
+with the namespace short name, which must end with a ``Bundle`` suffix.
 
 A namespace becomes a bundle as soon as you add a bundle class to it. The
 bundle class name must follow these simple rules:

cookbook/logging/monolog.rst

@@ -4,8 +4,8 @@
 How to Use Monolog to Write Logs
 ================================
 
-Monolog_ is a logging library for PHP 5.3 used by Symfony. It is
-inspired by the Python LogBook library.
+Monolog_ is a logging library for PHP used by Symfony. It is inspired by the
+Python LogBook library.
 
 Usage
 -----