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

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

class Zend_Validate_Ip extends Zend_Validate_Abstract
{
    const INVALID        = 'ipInvalid';
    const NOT_IP_ADDRESS = 'notIpAddress';

    protected $_messageTemplates = array(
        self::INVALID        => "Invalid type given, value should be a string",
        self::NOT_IP_ADDRESS => "'%value%' does not appear to be a valid IP address",
    );

    protected $_options = array(
        'allowipv6' => true,
        'allowipv4' => true
    );

    public function __construct($options = array())
    {
        if ($options instanceof Zend_Config) {
            $options = $options->toArray();
        } else if (!is_array($options)) {
            $options = func_get_args();
            $temp['allowipv6'] = array_shift($options);
            if (!empty($options)) {
                $temp['allowipv4'] = array_shift($options);
            }

            $options = $temp;
        }

        $options += $this->_options;
        $this->setOptions($options);
    }

    public function getOptions()
    {
        return $this->_options;
    }

    public function setOptions($options)
    {
        if (array_key_exists('allowipv6', $options)) {
            $this->_options['allowipv6'] = (boolean) $options['allowipv6'];
        }

        if (array_key_exists('allowipv4', $options)) {
            $this->_options['allowipv4'] = (boolean) $options['allowipv4'];
        }

        if (!$this->_options['allowipv4'] && !$this->_options['allowipv6']) {
            require_once 'Zend/Validate/Exception.php';
            throw new Zend_Validate_Exception('Nothing to validate. Check your options');
        }

        return $this;
    }

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

        $this->_setValue($value);
        if (($this->_options['allowipv4'] && !$this->_options['allowipv6'] && !$this->_validateIPv4($value)) ||
            (!$this->_options['allowipv4'] && $this->_options['allowipv6'] && !$this->_validateIPv6($value)) ||
            ($this->_options['allowipv4'] && $this->_options['allowipv6'] && !$this->_validateIPv4($value) && !$this->_validateIPv6($value))) {
            $this->_error(self::NOT_IP_ADDRESS);
            return false;
        }

        return true;
    }

    protected function _validateIPv4($value) {
        $ip2long = ip2long($value);
        if($ip2long === false) {
            return false;
        }

        return $value == long2ip($ip2long);
    }

    protected function _validateIPv6($value) {
        if (strlen($value) < 3) {
            return $value == '::';
        }

        if (strpos($value, '.')) {
            $lastcolon = strrpos($value, ':');
            if (!($lastcolon && $this->_validateIPv4(substr($value, $lastcolon + 1)))) {
                return false;
            }

            $value = substr($value, 0, $lastcolon) . ':0:0';
        }

        if (strpos($value, '::') === false) {
            return preg_match('/\A(?:[a-f0-9]{1,4}:){7}[a-f0-9]{1,4}\z/i', $value);
        }

        $colonCount = substr_count($value, ':');
        if ($colonCount < 8) {
            return preg_match('/\A(?::|(?:[a-f0-9]{1,4}:)+):(?:(?:[a-f0-9]{1,4}:)*[a-f0-9]{1,4})?\z/i', $value);
        }

        // special case with ending or starting double colon
        if ($colonCount == 8) {
            return preg_match('/\A(?:::)?(?:[a-f0-9]{1,4}:){6}[a-f0-9]{1,4}(?:::)?\z/i', $value);
        }

        return false;
    }
}