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   1  <?php
   2  /**
   3   * Zend Framework
   4   *
   5   * LICENSE
   6   *
   7   * This source file is subject to the new BSD license that is bundled
   8   * with this package in the file LICENSE.txt.
   9   * It is also available through the world-wide-web at this URL:
  10   * http://framework.zend.com/license/new-bsd
  11   * If you did not receive a copy of the license and are unable to
  12   * obtain it through the world-wide-web, please send an email
  13   * to [email protected] so we can send you a copy immediately.
  14   *
  15   * @category   Zend
  16   * @package    Zend_Validate
  17   * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
  18   * @license    http://framework.zend.com/license/new-bsd     New BSD License
  19   * @version    $Id$
  20   */
  21  
  22  /**
  23   * @see Zend_Validate_Abstract
  24   */
  25  require_once 'Zend/Validate/Abstract.php';
  26  
  27  /**
  28   * @category   Zend
  29   * @package    Zend_Validate
  30   * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
  31   * @license    http://framework.zend.com/license/new-bsd     New BSD License
  32   */
  33  class Zend_Validate_Digits extends Zend_Validate_Abstract
  34  {
  35      const NOT_DIGITS   = 'notDigits';
  36      const STRING_EMPTY = 'digitsStringEmpty';
  37      const INVALID      = 'digitsInvalid';
  38  
  39      /**
  40       * Digits filter used for validation
  41       *
  42       * @var Zend_Filter_Digits
  43       */
  44      protected static $_filter = null;
  45  
  46      /**
  47       * Validation failure message template definitions
  48       *
  49       * @var array
  50       */
  51      protected $_messageTemplates = array(
  52          self::NOT_DIGITS   => "'%value%' contains characters which are not digits; but only digits are allowed",
  53          self::STRING_EMPTY => "'%value%' is an empty string",
  54          self::INVALID      => "Invalid type given, value should be string, integer or float",
  55      );
  56  
  57      /**
  58       * Defined by Zend_Validate_Interface
  59       *
  60       * Returns true if and only if $value only contains digit characters
  61       *
  62       * @param  string $value
  63       * @return boolean
  64       */
  65      public function isValid($value)
  66      {
  67          if (!is_string($value) && !is_int($value) && !is_float($value)) {
  68              $this->_error(self::INVALID);
  69              return false;
  70          }
  71  
  72          $this->_setValue((string) $value);
  73  
  74          if ('' === $this->_value) {
  75              $this->_error(self::STRING_EMPTY);
  76              return false;
  77          }
  78  
  79          if (null === self::$_filter) {
  80              require_once 'Zend/Filter/Digits.php';
  81              self::$_filter = new Zend_Filter_Digits();
  82          }
  83  
  84          if ($this->_value !== self::$_filter->filter($this->_value)) {
  85              $this->_error(self::NOT_DIGITS);
  86              return false;
  87          }
  88  
  89          return true;
  90      }
  91  }