1 <?php

     2 

     3 /**

     4  * Zend Framework

     5  *

     6  * LICENSE

     7  *

     8  * This source file is subject to the new BSD license that is bundled

     9  * with this package in the file LICENSE.txt.

    10  * It is also available through the world-wide-web at this URL:

    11  * http://framework.zend.com/license/new-bsd

    12  * If you did not receive a copy of the license and are unable to

    13  * obtain it through the world-wide-web, please send an email

    14  * to license@zend.com so we can send you a copy immediately.

    15  *

    16  * @category   Zend

    17  * @package    Zend_Filter

    18  * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

    19  * @license    http://framework.zend.com/license/new-bsd     New BSD License

    20  * @version    $Id: Digits.php 20096 2010-01-06 02:05:09Z bkarwin $

    21  */

    22 

    23 

    24 /**

    25  * @see Zend_Filter_Interface

    26  */

    27 require_once 'Zend/Filter/Interface.php';

    28 

    29 

    30 /**

    31  * @category   Zend

    32  * @package    Zend_Filter

    33  * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

    34  * @license    http://framework.zend.com/license/new-bsd     New BSD License

    35  */

    36 class Zend_Filter_Digits implements Zend_Filter_Interface

    37 {

    38     /**

    39      * Is PCRE is compiled with UTF-8 and Unicode support

    40      *

    41      * @var mixed

    42      **/

    43     protected static $_unicodeEnabled;

    44 

    45     /**

    46      * Class constructor

    47      *

    48      * Checks if PCRE is compiled with UTF-8 and Unicode support

    49      *

    50      * @return void

    51      */

    52     public function __construct()

    53     {

    54         if (null === self::$_unicodeEnabled) {

    55             self::$_unicodeEnabled = (@preg_match('/\pL/u', 'a')) ? true : false;

    56         }

    57     }

    58 

    59     /**

    60      * Defined by Zend_Filter_Interface

    61      *

    62      * Returns the string $value, removing all but digit characters

    63      *

    64      * @param  string $value

    65      * @return string

    66      */

    67     public function filter($value)

    68     {

    69         if (!self::$_unicodeEnabled) {

    70             // POSIX named classes are not supported, use alternative 0-9 match

    71             $pattern = '/[^0-9]/';

    72         } else if (extension_loaded('mbstring')) {

    73             // Filter for the value with mbstring

    74             $pattern = '/[^[:digit:]]/';

    75         } else {

    76             // Filter for the value without mbstring

    77             $pattern = '/[\p{^N}]/';

    78         }

    79 

    80         return preg_replace($pattern, '', (string) $value);

    81     }

    82 }