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+<?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) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
+ * @license http://framework.zend.com/license/new-bsd New BSD License
+ * @version $Id: Digits.php 8064 2008-02-16 10:58:39Z thomas $
+ */
+
+
+/**
+ * @see Zend_Validate_Abstract
+ */
+require_once 'Zend/Validate/Abstract.php';
+
+
+/**
+ * @category Zend
+ * @package Zend_Validate
+ * @copyright Copyright (c) 2005-2008 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
+{
+ /**
+ * Validation failure message key for when the value contains non-digit characters
+ */
+ const NOT_DIGITS = 'notDigits';
+
+ /**
+ * Validation failure message key for when the value is an empty string
+ */
+ const STRING_EMPTY = 'stringEmpty';
+
+ /**
+ * 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%' contains not only digit characters",
+ self::STRING_EMPTY => "'%value%' is an empty string"
+ );
+
+ /**
+ * 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)
+ {
+ $valueString = (string) $value;
+
+ $this->_setValue($valueString);
+
+ if ('' === $valueString) {
+ $this->_error(self::STRING_EMPTY);
+ return false;
+ }
+
+ if (null === self::$_filter) {
+ /**
+ * @see Zend_Filter_Digits
+ */
+ require_once 'Zend/Filter/Digits.php';
+ self::$_filter = new Zend_Filter_Digits();
+ }
+
+ if ($valueString !== self::$_filter->filter($valueString)) {
+ $this->_error(self::NOT_DIGITS);
+ return false;
+ }
+
+ return true;
+ }
+
+}