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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) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Digits.php 8731 2008-03-10 15:08:03Z darby $
*/
/**
* @see Zend_Filter_Interface
*/
require_once 'Zend/Filter/Interface.php';
/**
* @category Zend
* @package Zend_Filter
* @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_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);
}
}
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