diff --git a/cake/libs/cake_session.php b/cake/libs/cake_session.php
index c590f28818b..91ed52f026f 100644
--- a/cake/libs/cake_session.php
+++ b/cake/libs/cake_session.php
@@ -393,9 +393,8 @@ public static function read($name = null) {
  * Returns all session variables.
  *
  * @return mixed Full $_SESSION array, or false on error.
- * @access private
  */
-	function __returnSessionVars() {
+	private static function __returnSessionVars() {
 		if (!empty($_SESSION)) {
 			return $_SESSION;
 		}
diff --git a/cake/libs/controller/cake_error_controller.php b/cake/libs/controller/cake_error_controller.php
index 765e79f3061..4430248402a 100644
--- a/cake/libs/controller/cake_error_controller.php
+++ b/cake/libs/controller/cake_error_controller.php
@@ -26,7 +26,7 @@ class CakeErrorController extends AppController {
 	function __construct() {
 		parent::__construct();
 		$this->_set(Router::getPaths());
-		$this->request = $this->params = Router::getRequest(false);
+		$this->request = Router::getRequest(false);
 		$this->constructClasses();
 		$this->Components->trigger('initialize', array(&$this));
 		$this->_set(array('cacheAction' => false, 'viewPath' => 'errors'));
diff --git a/cake/libs/debugger.php b/cake/libs/debugger.php
index f07ab78c616..33f665a2c22 100644
--- a/cake/libs/debugger.php
+++ b/cake/libs/debugger.php
@@ -236,7 +236,7 @@ public static function log($var, $level = LOG_DEBUG) {
  * @param array $context Context
  * @return boolean true if error was handled
  */
-	public function showError($code, $description, $file = null, $line = null, $context = null) {
+	public static function showError($code, $description, $file = null, $line = null, $context = null) {
 		$_this = Debugger::getInstance();
 
 		if (empty($file)) {
diff --git a/cake/libs/validation.php b/cake/libs/validation.php
index 5af6db7488c..adda137c001 100644
--- a/cake/libs/validation.php
+++ b/cake/libs/validation.php
@@ -415,7 +415,8 @@ public static function extension($check, $extensions = array('gif', 'jpeg', 'png
 		if (is_array($check)) {
 			return self::extension(array_shift($check), $extensions);
 		}
-		$extension = strtolower(array_pop(explode('.', $check)));
+		$pathSegments = explode('.', $check);
+		$extension = strtolower(array_pop($pathSegments));
 		foreach ($extensions as $value) {
 			if ($extension == strtolower($value)) {
 				return true;
@@ -431,7 +432,7 @@ public static function extension($check, $extensions = array('gif', 'jpeg', 'png
  * @param string $ipVersion The IP Protocol version to validate against
  * @return boolean Success
  */
-	public function ip($check, $type = 'both') {
+	public static function ip($check, $type = 'both') {
 		$type = strtolower($type);
 		$flags = array();
 		if ($type === 'ipv4' || $type === 'both') {
diff --git a/cake/libs/xml.php b/cake/libs/xml.php
index 160572b951a..0027d1631cc 100644
--- a/cake/libs/xml.php
+++ b/cake/libs/xml.php
@@ -182,7 +182,7 @@ public static function fromArray($input, $options = array()) {
  * @param string $format Either 'attribute' or 'tags'.  This determines where nested keys go.
  * @return void
  */
-	protected function _fromArray(&$dom, &$node, &$data, $format) {
+	protected static function _fromArray(&$dom, &$node, &$data, $format) {
 		if (empty($data) || !is_array($data)) {
 			return;
 		}
@@ -237,7 +237,7 @@ protected function _fromArray(&$dom, &$node, &$data, $format) {
  * @param array $data Array with informations to create childs
  * @return void
  */
-	private function __createChild($data) {
+	private static function __createChild($data) {
 		extract($data);
 		$childNS = $childValue = null;
 		if (is_array($value)) {
diff --git a/cake/tests/cases/libs/set.test.php b/cake/tests/cases/libs/set.test.php
index 1075b6cf762..a4d6a542739 100644
--- a/cake/tests/cases/libs/set.test.php
+++ b/cake/tests/cases/libs/set.test.php
@@ -2706,10 +2706,9 @@ function testApply() {
 /**
  * Helper method to test Set::apply()
  *
- * @access protected
  * @return void
  */
-	function _method($val1, $val2) {
+	static function _method($val1, $val2) {
 		$val1 += $val2;
 		return $val1;
 	}
diff --git a/cake/tests/cases/libs/validation.test.php b/cake/tests/cases/libs/validation.test.php
index a794453d8c8..002902a9d4e 100644
--- a/cake/tests/cases/libs/validation.test.php
+++ b/cake/tests/cases/libs/validation.test.php
@@ -34,7 +34,7 @@ class CustomValidator {
  * @return boolean
  * @access public
  */
-	function customValidate($check) {
+	static function customValidate($check) {
 		return (bool)preg_match('/^[0-9]{3}$/', $check);
 	}
 }
@@ -53,7 +53,7 @@ class TestNlValidation {
  * @param string $check
  * @return void
  */
-	function postal($check) {
+	static function postal($check) {
 		return true;
 	}
 /**
@@ -61,7 +61,7 @@ function postal($check) {
  *
  * @return void
  */
-	function ssn($check) {
+	static function ssn($check) {
 		return true;
 	}
 }
@@ -80,7 +80,7 @@ class TestDeValidation {
  * @param string $check
  * @return void
  */
-	function phone($check) {
+	static function phone($check) {
 		return true;
 	}
 }