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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_Filter
  * @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_Filter_Interface
  */
 // require_once 'Zend/Filter/Interface.php';
 
 
 /**
  * @category   Zend
  * @package    Zend_Filter
  * @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_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);
     }
 }