--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/Zend/Filter/Digits.php	Mon Dec 13 18:29:26 2010 +0100
@@ -0,0 +1,82 @@
+<?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: Digits.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_Digits implements Zend_Filter_Interface
+{
+    /**
+     * Is PCRE is compiled with UTF-8 and Unicode support
+     *
+     * @var mixed
+     **/
+    protected static $_unicodeEnabled;
+
+    /**
+     * Class constructor
+     *
+     * Checks if PCRE is compiled with UTF-8 and Unicode support
+     *
+     * @return void
+     */
+    public function __construct()
+    {
+        if (null === self::$_unicodeEnabled) {
+            self::$_unicodeEnabled = (@preg_match('/\pL/u', 'a')) ? true : false;
+        }
+    }
+
+    /**
+     * Defined by Zend_Filter_Interface
+     *
+     * Returns the string $value, removing all but digit characters
+     *
+     * @param  string $value
+     * @return string
+     */
+    public function filter($value)
+    {
+        if (!self::$_unicodeEnabled) {
+            // POSIX named classes are not supported, use alternative 0-9 match
+            $pattern = '/[^0-9]/';
+        } else if (extension_loaded('mbstring')) {
+            // Filter for the value with mbstring
+            $pattern = '/[^[:digit:]]/';
+        } else {
+            // Filter for the value without mbstring
+            $pattern = '/[\p{^N}]/';
+        }
+
+        return preg_replace($pattern, '', (string) $value);
+    }
+}