hostname.php

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    public function setAllow($allow)
    {
        $this->_allow = $allow;
        return $this;
    }

    /**
     * Set whether IDN domains are validated
     *
     * This only applies when DNS hostnames are validated
     *
     * @param boolean $allowed Set allowed to true to validate IDNs, and false to not validate them
     */
    public function setValidateIdn ($allowed)
    {
        $this->_validateIdn = (bool) $allowed;
    }

    /**
     * Set whether the TLD element of a hostname is validated
     *
     * This only applies when DNS hostnames are validated
     *
     * @param boolean $allowed Set allowed to true to validate TLDs, and false to not validate them
     */
    public function setValidateTld ($allowed)
    {
        $this->_validateTld = (bool) $allowed;
    }

    /**
     * Sets the check option
     *
     * @param  integer $check
     * @return Zend_Validate_Hostname Provides a fluent interface
     */
    /*
    public function setCheck($check)
    {
        $this->_check = $check;
        return $this;
    }
     */

    /**
     * Defined by Zend_Validate_Interface
     *
     * Returns true if and only if the $value is a valid hostname with respect to the current allow option
     *
     * @param  string $value
     * @throws Zend_Validate_Exception if a fatal error occurs for validation process
     * @return boolean
     */
    public function isValid($value)
    {
        $valueString = (string) $value;

        $this->_setValue($valueString);

        // Check input against IP address schema
        if ($this->_ipValidator->setTranslator($this->getTranslator())->isValid($valueString)) {
            if (!($this->_allow & self::ALLOW_IP)) {
                $this->_error(self::IP_ADDRESS_NOT_ALLOWED);
                return false;
            } else{
                return true;
            }
        }

        // Check input against DNS hostname schema
        $domainParts = explode('.', $valueString);
        if ((count($domainParts) > 1) && (strlen($valueString) >= 4) && (strlen($valueString) <= 254)) {
            $status = false;

            do {
                // First check TLD
                if (preg_match('/([a-z]{2,10})$/i', end($domainParts), $matches)) {

                    reset($domainParts);

                    // Hostname characters are: *(label dot)(label dot label); max 254 chars
                    // label: id-prefix [*ldh{61} id-prefix]; max 63 chars
                    // id-prefix: alpha / digit
                    // ldh: alpha / digit / dash

                    // Match TLD against known list
                    $this->_tld = strtolower($matches[1]);
                    if ($this->_validateTld) {
                        if (!in_array($this->_tld, $this->_validTlds)) {
                            $this->_error(self::UNKNOWN_TLD);
                            $status = false;
                            break;
                        }
                    }

                    /**
                     * Match against IDN hostnames
                     * @see Zend_Validate_Hostname_Interface
                     */
                    $labelChars = 'a-z0-9';
                    $utf8 = false;
                    $classFile = 'Zend/Validate/Hostname/' . ucfirst($this->_tld) . '.php';
                    if ($this->_validateIdn) {
                        if (Zend_Loader::isReadable($classFile)) {

                            // Load additional characters
                            $className = 'Zend_Validate_Hostname_' . ucfirst($this->_tld);
                            Zend_Loader::loadClass($className);
                            $labelChars .= call_user_func(array($className, 'getCharacters'));
                            $utf8 = true;
                        }
                    }

                    // Keep label regex short to avoid issues with long patterns when matching IDN hostnames
                    $regexLabel = '/^[' . $labelChars . '\x2d]{1,63}$/i';
                    if ($utf8) {
                        $regexLabel .= 'u';
                    }

                    // Check each hostname part
                    $valid = true;
                    foreach ($domainParts as $domainPart) {

                        // Check dash (-) does not start, end or appear in 3rd and 4th positions
                        if (strpos($domainPart, '-') === 0 ||
                        (strlen($domainPart) > 2 && strpos($domainPart, '-', 2) == 2 && strpos($domainPart, '-', 3) == 3) ||
                        strrpos($domainPart, '-') === strlen($domainPart) - 1) {

                            $this->_error(self::INVALID_DASH);
                            $status = false;
                            break 2;
                        }

                        // Check each domain part
                        $status = @preg_match($regexLabel, $domainPart);
                        if ($status === false) {
                            /**
                             * Regex error
                             * @see Zend_Validate_Exception
                             */
                            require_once 'Zend/Validate/Exception.php';
                            throw new Zend_Validate_Exception('Internal error: DNS validation failed');
                        } elseif ($status === 0) {
                            $valid = false;
                        }
                    }

                    // If all labels didn't match, the hostname is invalid
                    if (!$valid) {
                        $this->_error(self::INVALID_HOSTNAME_SCHEMA);
                        $status = false;
                    }

                } else {
                    // Hostname not long enough
                    $this->_error(self::UNDECIPHERABLE_TLD);
                    $status = false;
                }
            } while (false);

            // If the input passes as an Internet domain name, and domain names are allowed, then the hostname
            // passes validation
            if ($status && ($this->_allow & self::ALLOW_DNS)) {
                return true;
            }
        } else {
            $this->_error(self::INVALID_HOSTNAME);
        }

        // Check input against local network name schema; last chance to pass validation
        $regexLocal = '/^(([a-zA-Z0-9\x2d]{1,63}\x2e)*[a-zA-Z0-9\x2d]{1,63}){1,254}$/';
        $status = @preg_match($regexLocal, $valueString);
        if (false === $status) {
            /**
             * Regex error
             * @see Zend_Validate_Exception
             */
            require_once 'Zend/Validate/Exception.php';
            throw new Zend_Validate_Exception('Internal error: local network name validation failed');
        }

        // If the input passes as a local network name, and local network names are allowed, then the
        // hostname passes validation
        $allowLocal = $this->_allow & self::ALLOW_LOCAL;
        if ($status && $allowLocal) {
            return true;
        }

        // If the input does not pass as a local network name, add a message
        if (!$status) {
            $this->_error(self::INVALID_LOCAL_NAME);
        }

        // If local network names are not allowed, add a message
        if ($status && !$allowLocal) {
            $this->_error(self::LOCAL_NAME_NOT_ALLOWED);
        }

        return false;
    }

    /**
     * Throws an exception if a regex for $type does not exist
     *
     * @param  string $type
     * @throws Zend_Validate_Exception
     * @return Zend_Validate_Hostname Provides a fluent interface
     */
    /*
    protected function _checkRegexType($type)
    {
        if (!isset($this->_regex[$type])) {
            require_once 'Zend/Validate/Exception.php';
            throw new Zend_Validate_Exception("'$type' must be one of ('" . implode(', ', array_keys($this->_regex))
                                            . "')");
        }
        return $this;
    }
     */

}