interface/modules/zend_modules/library/Zend/I18n/Filter/Alpha.php

   1 <?php
   2 /**
   3  * Zend Framework (http://framework.zend.com/)
   4  *
   5  * @link      http://github.com/zendframework/zf2 for the canonical source repository
   6  * @copyright Copyright (c) 2005-2013 Zend Technologies USA Inc. (http://www.zend.com)
   7  * @license   http://framework.zend.com/license/new-bsd New BSD License
   8  */
   9
  10 namespace Zend\I18n\Filter;
  11
  12 use Locale;
  13
  14 class Alpha extends Alnum
  15 {
  16     /**
  17      * Defined by Zend\Filter\FilterInterface
  18      *
  19      * Returns the string $value, removing all but alphabetic characters
  20      *
  21      * @param  string $value
  22      * @return string
  23      */
  24     public function filter($value)
  25     {
  26         $whiteSpace = $this->options['allow_white_space'] ? '\s' : '';
  27         $language   = Locale::getPrimaryLanguage($this->getLocale());
  28
  29         if (!static::hasPcreUnicodeSupport()) {
  30             // POSIX named classes are not supported, use alternative [a-zA-Z] match
  31             $pattern = '/[^a-zA-Z' . $whiteSpace . ']/';
  32         } elseif ($language == 'ja' || $language == 'ko' || $language == 'zh') {
  33             // Use english alphabet
  34             $pattern = '/[^a-zA-Z'  . $whiteSpace . ']/u';
  35         } else {
  36             // Use native language alphabet
  37             $pattern = '/[^\p{L}' . $whiteSpace . ']/u';
  38         }
  39
  40         return preg_replace($pattern, '', (string) $value);
  41     }
  42 }