diff -r 000000000000 -r 4eba9c11703f web/Zend/Filter/Null.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/Zend/Filter/Null.php	Mon Dec 13 18:29:26 2010 +0100
@@ -0,0 +1,183 @@
+<?php
+/**
+ * Zend Framework
+ *
+ * LICENSE
+ *
+ * This source file is subject to the new BSD license that is bundled
+ * with this package in the file LICENSE.txt.
+ * It is also available through the world-wide-web at this URL:
+ * http://framework.zend.com/license/new-bsd
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to license@zend.com so we can send you a copy immediately.
+ *
+ * @category   Zend
+ * @package    Zend_Filter
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ * @version    $Id: Null.php 20096 2010-01-06 02:05:09Z bkarwin $
+ */
+
+/**
+ * @see Zend_Filter_Interface
+ */
+require_once 'Zend/Filter/Interface.php';
+
+/**
+ * @category   Zend
+ * @package    Zend_Filter
+ * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license    http://framework.zend.com/license/new-bsd     New BSD License
+ */
+class Zend_Filter_Null implements Zend_Filter_Interface
+{
+    const BOOLEAN      = 1;
+    const INTEGER      = 2;
+    const EMPTY_ARRAY  = 4;
+    const STRING       = 8;
+    const ZERO         = 16;
+    const ALL          = 31;
+
+    protected $_constants = array(
+        self::BOOLEAN     => 'boolean',
+        self::INTEGER     => 'integer',
+        self::EMPTY_ARRAY => 'array',
+        self::STRING      => 'string',
+        self::ZERO        => 'zero',
+        self::ALL         => 'all'
+    );
+
+    /**
+     * Internal type to detect
+     *
+     * @var integer
+     */
+    protected $_type = self::ALL;
+
+    /**
+     * Constructor
+     *
+     * @param string|array|Zend_Config $options OPTIONAL
+     */
+    public function __construct($options = null)
+    {
+        if ($options instanceof Zend_Config) {
+            $options = $options->toArray();
+        } else if (!is_array($options)) {
+            $options = func_get_args();
+            $temp    = array();
+            if (!empty($options)) {
+                $temp = array_shift($options);
+            }
+            $options = $temp;
+        } else if (is_array($options) && array_key_exists('type', $options)) {
+            $options = $options['type'];
+        }
+
+        if (!empty($options)) {
+            $this->setType($options);
+        }
+    }
+
+    /**
+     * Returns the set null types
+     *
+     * @return array
+     */
+    public function getType()
+    {
+        return $this->_type;
+    }
+
+    /**
+     * Set the null types
+     *
+     * @param  integer|array $type
+     * @throws Zend_Filter_Exception
+     * @return Zend_Filter_Null
+     */
+    public function setType($type = null)
+    {
+        if (is_array($type)) {
+            $detected = 0;
+            foreach($type as $value) {
+                if (is_int($value)) {
+                    $detected += $value;
+                } else if (in_array($value, $this->_constants)) {
+                    $detected += array_search($value, $this->_constants);
+                }
+            }
+
+            $type = $detected;
+        } else if (is_string($type)) {
+            if (in_array($type, $this->_constants)) {
+                $type = array_search($type, $this->_constants);
+            }
+        }
+
+        if (!is_int($type) || ($type < 0) || ($type > self::ALL)) {
+            require_once 'Zend/Filter/Exception.php';
+            throw new Zend_Filter_Exception('Unknown type');
+        }
+
+        $this->_type = $type;
+        return $this;
+    }
+
+    /**
+     * Defined by Zend_Filter_Interface
+     *
+     * Returns null representation of $value, if value is empty and matches
+     * types that should be considered null.
+     *
+     * @param  string $value
+     * @return string
+     */
+    public function filter($value)
+    {
+        $type = $this->getType();
+
+        // STRING ZERO ('0')
+        if ($type >= self::ZERO) {
+            $type -= self::ZERO;
+            if (is_string($value) && ($value == '0')) {
+                return null;
+            }
+        }
+
+        // STRING ('')
+        if ($type >= self::STRING) {
+            $type -= self::STRING;
+            if (is_string($value) && ($value == '')) {
+                return null;
+            }
+        }
+
+        // EMPTY_ARRAY (array())
+        if ($type >= self::EMPTY_ARRAY) {
+            $type -= self::EMPTY_ARRAY;
+            if (is_array($value) && ($value == array())) {
+                return null;
+            }
+        }
+
+        // INTEGER (0)
+        if ($type >= self::INTEGER) {
+            $type -= self::INTEGER;
+            if (is_int($value) && ($value == 0)) {
+                return null;
+            }
+        }
+
+        // BOOLEAN (false)
+        if ($type >= self::BOOLEAN) {
+            $type -= self::BOOLEAN;
+            if (is_bool($value) && ($value == false)) {
+                return null;
+            }
+        }
+
+        return $value;
+    }
+}