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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: Alpha.php 12751 2008-11-21 18:30:48Z yoshida@zend.co.jp $
*/
/**
* @see Zend_Filter_Interface
*/
require_once 'Zend/Filter/Interface.php';
/**
* @see Zend_Locale
*/
require_once 'Zend/Locale.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_Alpha implements Zend_Filter_Interface
{
/**
* Whether to allow white space characters; off by default
*
* @var boolean
*/
public $allowWhiteSpace;
/**
* Is PCRE is compiled with UTF-8 and Unicode support
*
* @var mixed
**/
protected static $_unicodeEnabled;
/**
* Locale in browser.
*
* @var Zend_Locale object
*/
protected $_locale;
/**
* The Alphabet means english alphabet.
*
* @var boolean
*/
protected static $_meansEnglishAlphabet;
/**
* Sets default option values for this instance
*
* @param boolean $allowWhiteSpace
* @return void
*/
public function __construct($allowWhiteSpace = false)
{
$this->allowWhiteSpace = (boolean) $allowWhiteSpace;
if (null === self::$_unicodeEnabled) {
self::$_unicodeEnabled = (@preg_match('/\pL/u', 'a')) ? true : false;
}
if (null === self::$_meansEnglishAlphabet) {
$this->_locale = new Zend_Locale('auto');
self::$_meansEnglishAlphabet = in_array($this->_locale->getLanguage(),
array('ja', 'ko', 'zh')
);
}
}
/**
* Defined by Zend_Filter_Interface
*
* Returns the string $value, removing all but alphabetic characters
*
* @param string $value
* @return string
*/
public function filter($value)
{
$whiteSpace = $this->allowWhiteSpace ? '\s' : '';
if (!self::$_unicodeEnabled) {
// POSIX named classes are not supported, use alternative a-zA-Z match
$pattern = '/[^a-zA-Z' . $whiteSpace . ']/';
} else if (self::$_meansEnglishAlphabet) {
//The Alphabet means english alphabet.
$pattern = '/[^a-zA-Z' . $whiteSpace . ']/u';
} else {
//The Alphabet means each language's alphabet.
$pattern = '/[^\p{L}' . $whiteSpace . ']/u';
}
return preg_replace($pattern, '', (string) $value);
}
}
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