interface/modules/zend_modules/library/Zend/Filter/Digits.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\Filter;
  11
  12 use Zend\Stdlib\StringUtils;
  13
  14 class Digits extends AbstractFilter
  15 {
  16     /**
  17      * Defined by Zend\Filter\FilterInterface
  18      *
  19      * Returns the string $value, removing all but digit characters
  20      *
  21      * If the value provided is non-scalar, the value will remain unfiltered
  22      * and an E_USER_WARNING will be raised indicating it's unfilterable.
  23      *
  24      * @param  string $value
  25      * @return string|mixed
  26      */
  27     public function filter($value)
  28     {
  29         if (null === $value) {
  30             return null;
  31         }
  32
  33         if (!is_scalar($value)) {
  34             trigger_error(
  35                 sprintf(
  36                     '%s expects parameter to be scalar, "%s" given; cannot filter',
  37                     __METHOD__,
  38                     (is_object($value) ? get_class($value) : gettype($value))
  39                 ),
  40                 E_USER_WARNING
  41             );
  42             return $value;
  43         }
  44
  45         if (!StringUtils::hasPcreUnicodeSupport()) {
  46             // POSIX named classes are not supported, use alternative 0-9 match
  47             $pattern = '/[^0-9]/';
  48         } elseif (extension_loaded('mbstring')) {
  49             // Filter for the value with mbstring
  50             $pattern = '/[^[:digit:]]/';
  51         } else {
  52             // Filter for the value without mbstring
  53             $pattern = '/[\p{^N}]/';
  54         }
  55
  56         return preg_replace($pattern, '', (string) $value);
  57     }
  58 }