value * * @link http://www.sitemaps.org/protocol.php Sitemaps XML format * * @category Zend * @package Zend_Validate * @subpackage Sitemap * @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com) * @license http://framework.zend.com/license/new-bsd New BSD License */ class Zend_Validate_Sitemap_Changefreq extends Zend_Validate_Abstract { /** * Validation key for not valid * */ const NOT_VALID = 'sitemapChangefreqNotValid'; const INVALID = 'sitemapChangefreqInvalid'; /** * Validation failure message template definitions * * @var array */ protected $_messageTemplates = array( self::NOT_VALID => "'%value%' is no valid sitemap changefreq", self::INVALID => "Invalid type given. String expected", ); /** * Valid change frequencies * * @var array */ protected $_changeFreqs = array( 'always', 'hourly', 'daily', 'weekly', 'monthly', 'yearly', 'never' ); /** * Validates if a string is valid as a sitemap changefreq * * @link http://www.sitemaps.org/protocol.php#changefreqdef * * @param string $value value to validate * @return boolean */ public function isValid($value) { if (!is_string($value)) { $this->_error(self::INVALID); return false; } $this->_setValue($value); if (!is_string($value)) { return false; } if (!in_array($value, $this->_changeFreqs, true)) { $this->_error(self::NOT_VALID); return false; } return true; } }