diff --git a/src/Symfony/Component/HttpFoundation/ParameterBag.php b/src/Symfony/Component/HttpFoundation/ParameterBag.php
index 35b4869533..4560322671 100644
--- a/src/Symfony/Component/HttpFoundation/ParameterBag.php
+++ b/src/Symfony/Component/HttpFoundation/ParameterBag.php
@@ -90,7 +90,7 @@ class ParameterBag implements \IteratorAggregate, \Countable
      */
     public function get($key, $default = null, $deep = false)
     {
-        if (true === $deep) {
+        if ($deep) {
             @trigger_error('Using paths to find deeper items in '.__METHOD__.' is deprecated since version 2.8 and will be removed in 3.0. Filter the returned value in your own code instead.', E_USER_DEPRECATED);
         }
 
@@ -214,7 +214,7 @@ class ParameterBag implements \IteratorAggregate, \Countable
     public function getDigits($key, $default = '', $deep = false)
     {
         // we need to remove - and + because they're allowed in the filter
-        return str_replace(array('-', '+'), '', $this->filter($key, $default, $deep, FILTER_SANITIZE_NUMBER_INT));
+        return str_replace(array('-', '+'), '', $this->filter($key, $default, FILTER_SANITIZE_NUMBER_INT, array(), $deep));
     }
 
     /**
@@ -242,7 +242,7 @@ class ParameterBag implements \IteratorAggregate, \Countable
      */
     public function getBoolean($key, $default = false, $deep = false)
     {
-        return $this->filter($key, $default, $deep, FILTER_VALIDATE_BOOLEAN);
+        return $this->filter($key, $default, FILTER_VALIDATE_BOOLEAN, array(), $deep);
     }
 
     /**
@@ -250,16 +250,31 @@ class ParameterBag implements \IteratorAggregate, \Countable
      *
      * @param string $key     Key.
      * @param mixed  $default Default = null.
-     * @param bool   $deep    Default = false.
      * @param int    $filter  FILTER_* constant.
      * @param mixed  $options Filter options.
+     * @param bool   $deep    Default = false.
      *
      * @see http://php.net/manual/en/function.filter-var.php
      *
      * @return mixed
      */
-    public function filter($key, $default = null, $deep = false, $filter = FILTER_DEFAULT, $options = array())
+    public function filter($key, $default = null, $filter = FILTER_DEFAULT, $options = array(), $deep = false)
     {
+        static $filters = null;
+
+        if (null === $filters) {
+            foreach (filter_list() as $tmp) {
+                $filters[filter_id($tmp)] = 1;
+            }
+        }
+        if (is_bool($filter) || !isset($filters[$filter]) || is_array($deep)) {
+            @trigger_error('Passing the $deep boolean as 3rd argument to the '.__METHOD__.' method is deprecated since version 2.8 and will be removed in 3.0. Remove it altogether as the $deep argument will be removed in 3.0.', E_USER_ERROR);
+            $tmp = $deep;
+            $deep = $filter;
+            $filter = $options;
+            $options = $tmp;
+        }
+
         $value = $this->get($key, $default, $deep);
 
         // Always turn $options into an array - this allows filter_var option shortcuts.
diff --git a/src/Symfony/Component/HttpFoundation/Request.php b/src/Symfony/Component/HttpFoundation/Request.php
index edc77df10d..de36953cec 100644
--- a/src/Symfony/Component/HttpFoundation/Request.php
+++ b/src/Symfony/Component/HttpFoundation/Request.php
@@ -724,7 +724,7 @@ class Request
      */
     public function get($key, $default = null, $deep = false)
     {
-        if (true === $deep) {
+        if ($deep) {
             @trigger_error('Using paths to find deeper items in '.__METHOD__.' is deprecated since version 2.8 and will be removed in 3.0. Filter the returned value in your own code instead.', E_USER_DEPRECATED);
         }
 
diff --git a/src/Symfony/Component/HttpFoundation/Tests/ParameterBagTest.php b/src/Symfony/Component/HttpFoundation/Tests/ParameterBagTest.php
index d797fb3bbd..06a6cbf413 100644
--- a/src/Symfony/Component/HttpFoundation/Tests/ParameterBagTest.php
+++ b/src/Symfony/Component/HttpFoundation/Tests/ParameterBagTest.php
@@ -172,26 +172,26 @@ class ParameterBagTest extends \PHPUnit_Framework_TestCase
 
         $this->assertEmpty($bag->filter('nokey'), '->filter() should return empty by default if no key is found');
 
-        $this->assertEquals('0123', $bag->filter('digits', '', false, FILTER_SANITIZE_NUMBER_INT), '->filter() gets a value of parameter as integer filtering out invalid characters');
+        $this->assertEquals('0123', $bag->filter('digits', '', FILTER_SANITIZE_NUMBER_INT), '->filter() gets a value of parameter as integer filtering out invalid characters');
 
-        $this->assertEquals('example@example.com', $bag->filter('email', '', false, FILTER_VALIDATE_EMAIL), '->filter() gets a value of parameter as email');
+        $this->assertEquals('example@example.com', $bag->filter('email', '', FILTER_VALIDATE_EMAIL), '->filter() gets a value of parameter as email');
 
-        $this->assertEquals('http://example.com/foo', $bag->filter('url', '', false, FILTER_VALIDATE_URL, array('flags' => FILTER_FLAG_PATH_REQUIRED)), '->filter() gets a value of parameter as URL with a path');
+        $this->assertEquals('http://example.com/foo', $bag->filter('url', '', FILTER_VALIDATE_URL, array('flags' => FILTER_FLAG_PATH_REQUIRED)), '->filter() gets a value of parameter as URL with a path');
 
         // This test is repeated for code-coverage
-        $this->assertEquals('http://example.com/foo', $bag->filter('url', '', false, FILTER_VALIDATE_URL, FILTER_FLAG_PATH_REQUIRED), '->filter() gets a value of parameter as URL with a path');
+        $this->assertEquals('http://example.com/foo', $bag->filter('url', '', FILTER_VALIDATE_URL, FILTER_FLAG_PATH_REQUIRED), '->filter() gets a value of parameter as URL with a path');
 
-        $this->assertFalse($bag->filter('dec', '', false, FILTER_VALIDATE_INT, array(
+        $this->assertFalse($bag->filter('dec', '', FILTER_VALIDATE_INT, array(
             'flags' => FILTER_FLAG_ALLOW_HEX,
             'options' => array('min_range' => 1, 'max_range' => 0xff),
         )), '->filter() gets a value of parameter as integer between boundaries');
 
-        $this->assertFalse($bag->filter('hex', '', false, FILTER_VALIDATE_INT, array(
+        $this->assertFalse($bag->filter('hex', '', FILTER_VALIDATE_INT, array(
             'flags' => FILTER_FLAG_ALLOW_HEX,
             'options' => array('min_range' => 1, 'max_range' => 0xff),
         )), '->filter() gets a value of parameter as integer between boundaries');
 
-        $this->assertEquals(array('bang'), $bag->filter('array', '', false), '->filter() gets a value of parameter as an array');
+        $this->assertEquals(array('bang'), $bag->filter('array', ''), '->filter() gets a value of parameter as an array');
     }
 
     public function testGetIterator()