C:/xampp/htdocs/moodle/lib/zend/Zend/Validate/Sitemap/Priority.php

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<?php
require_once 'Zend/Validate/Abstract.php';

class Zend_Validate_Sitemap_Priority extends Zend_Validate_Abstract
{
    const NOT_VALID = 'sitemapPriorityNotValid';
    const INVALID   = 'sitemapPriorityInvalid';

    protected $_messageTemplates = array(
        self::NOT_VALID => "'%value%' is no valid sitemap priority",
        self::INVALID   => "Invalid type given, the value should be a integer, a float or a numeric string",
    );

    public function isValid($value)
    {
        if (!is_numeric($value)) {
            $this->_error(self::INVALID);
            return false;
        }

        $this->_setValue($value);
        $value = (float) $value;
        if ($value < 0 || $value > 1) {
            $this->_error(self::NOT_VALID);
            return false;
        }

        return true;
    }
}