diff -r 5b37998e522e -r 162c1de6545a web/lib/Zend/Validate/Digits.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/lib/Zend/Validate/Digits.php	Fri Mar 11 15:05:35 2011 +0100
@@ -0,0 +1,91 @@
+<?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_Validate
+ * @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 22668 2010-07-25 14:50:46Z thomas $
+ */
+
+/**
+ * @see Zend_Validate_Abstract
+ */
+require_once 'Zend/Validate/Abstract.php';
+
+/**
+ * @category   Zend
+ * @package    Zend_Validate
+ * @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_Validate_Digits extends Zend_Validate_Abstract
+{
+    const NOT_DIGITS   = 'notDigits';
+    const STRING_EMPTY = 'digitsStringEmpty';
+    const INVALID      = 'digitsInvalid';
+
+    /**
+     * Digits filter used for validation
+     *
+     * @var Zend_Filter_Digits
+     */
+    protected static $_filter = null;
+
+    /**
+     * Validation failure message template definitions
+     *
+     * @var array
+     */
+    protected $_messageTemplates = array(
+        self::NOT_DIGITS   => "'%value%' must contain only digits",
+        self::STRING_EMPTY => "'%value%' is an empty string",
+        self::INVALID      => "Invalid type given. String, integer or float expected",
+    );
+
+    /**
+     * Defined by Zend_Validate_Interface
+     *
+     * Returns true if and only if $value only contains digit characters
+     *
+     * @param  string $value
+     * @return boolean
+     */
+    public function isValid($value)
+    {
+        if (!is_string($value) && !is_int($value) && !is_float($value)) {
+            $this->_error(self::INVALID);
+            return false;
+        }
+
+        $this->_setValue((string) $value);
+
+        if ('' === $this->_value) {
+            $this->_error(self::STRING_EMPTY);
+            return false;
+        }
+
+        if (null === self::$_filter) {
+            require_once 'Zend/Filter/Digits.php';
+            self::$_filter = new Zend_Filter_Digits();
+        }
+
+        if ($this->_value !== self::$_filter->filter($this->_value)) {
+            $this->_error(self::NOT_DIGITS);
+            return false;
+        }
+
+        return true;
+    }
+}