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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) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
  * @license    http://framework.zend.com/license/new-bsd     New BSD License
  * @version    $Id$
  */
 
 /**
  * @see Zend_Validate_Abstract
  */
 // require_once 'Zend/Validate/Abstract.php';
 
 /**
  * @category   Zend
  * @package    Zend_Validate
  * @copyright  Copyright (c) 2005-2015 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;
     }
 }