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

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

class Zend_Validate_Isbn extends Zend_Validate_Abstract
{
    const AUTO    = 'auto';
    const ISBN10  = '10';
    const ISBN13  = '13';
    const INVALID = 'isbnInvalid';
    const NO_ISBN = 'isbnNoIsbn';

    protected $_messageTemplates = array(
        self::INVALID => "Invalid type given, value should be string or integer",
        self::NO_ISBN => "'%value%' is no valid ISBN number",
    );

    protected $_type = self::AUTO;

    protected $_separator = '';

    public function __construct($options = array())
    {
        // prepare options
        if ($options instanceof Zend_Config) {
            $options = $options->toArray();
        }
        if (!is_array($options)) {
            require_once 'Zend/Validate/Exception.php';
            throw new Zend_Validate_Exception('Invalid options provided.');
        }

        // set type
        if (array_key_exists('type', $options)) {
            $this->setType($options['type']);
        }

        // set separator
        if (array_key_exists('separator', $options)) {
            $this->setSeparator($options['separator']);
        }
    }

    protected function _detectFormat()
    {
        // prepare separator and pattern list
        $sep      = quotemeta($this->_separator);
        $patterns = array();
        $lengths  = array();

        // check for ISBN-10
        if ($this->_type == self::ISBN10 || $this->_type == self::AUTO) {
            if (empty($sep)) {
                $pattern = '/^[0-9]{9}[0-9X]{1}$/';
                $length  = 10;
            } else {
                $pattern = "/^[0-9]{1,7}[{$sep}]{1}[0-9]{1,7}[{$sep}]{1}[0-9]{1,7}[{$sep}]{1}[0-9X]{1}$/";
                $length  = 13;
            }

            $patterns[$pattern] = self::ISBN10;
            $lengths[$pattern]  = $length;
        }

        // check for ISBN-13
        if ($this->_type == self::ISBN13 || $this->_type == self::AUTO) {
            if (empty($sep)) {
                $pattern = '/^[0-9]{13}$/';
                $length  = 13;
            } else {
                $pattern = "/^[0-9]{1,9}[{$sep}]{1}[0-9]{1,5}[{$sep}]{1}[0-9]{1,9}[{$sep}]{1}[0-9]{1,9}[{$sep}]{1}[0-9]{1}$/";
                $length  = 17;
            }

            $patterns[$pattern] = self::ISBN13;
            $lengths[$pattern]  = $length;
        }

        // check pattern list
        foreach ($patterns as $pattern => $type) {
            if ((strlen($this->_value) == $lengths[$pattern]) && preg_match($pattern, $this->_value)) {
                return $type;
            }
        }

        return null;
    }

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

        $value = (string) $value;
        $this->_setValue($value);

        switch ($this->_detectFormat()) {
            case self::ISBN10:
                // sum
                $isbn10 = str_replace($this->_separator, '', $value);
                $sum    = 0;
                for ($i = 0; $i < 9; $i++) {
                    $sum += (10 - $i) * $isbn10{$i};
                }

                // checksum
                $checksum = 11 - ($sum % 11);
                if ($checksum == 11) {
                    $checksum = '0';
                } elseif ($checksum == 10) {
                    $checksum = 'X';
                }
                break;

            case self::ISBN13:
                // sum
                $isbn13 = str_replace($this->_separator, '', $value);
                $sum    = 0;
                for ($i = 0; $i < 12; $i++) {
                    if ($i % 2 == 0) {
                        $sum += $isbn13{$i};
                    } else {
                        $sum += 3 * $isbn13{$i};
                    }
                }
                // checksum
                $checksum = 10 - ($sum % 10);
                if ($checksum == 10) {
                    $checksum = '0';
                }
                break;

            default:
                $this->_error(self::NO_ISBN);
                return false;
        }

        // validate
        if (substr($this->_value, -1) != $checksum) {
            $this->_error(self::NO_ISBN);
            return false;
        }
        return true;
    }

    public function setSeparator($separator)
    {
        // check separator
        if (!in_array($separator, array('-', ' ', ''))) {
            require_once 'Zend/Validate/Exception.php';
            throw new Zend_Validate_Exception('Invalid ISBN separator.');
        }

        $this->_separator = $separator;
        return $this;
    }

    public function getSeparator()
    {
        return $this->_separator;
    }

    public function setType($type)
    {
        // check type
        if (!in_array($type, array(self::AUTO, self::ISBN10, self::ISBN13))) {
            require_once 'Zend/Validate/Exception.php';
            throw new Zend_Validate_Exception('Invalid ISBN type');
        }

        $this->_type = $type;
        return $this;
    }

    public function getType()
    {
        return $this->_type;
    }
}