European Vat Checker

[color=gray][b]@description:[/b][/color] Vat number ID validation for Europe, it can validate with regex acording to this: http://ec.europa.eu/taxation_customs/vies/faqvies.do and also using their online database http://ec.europa.eu/taxation_customs/vies/

[color=gray][b]@depends on:[/b][/color] http://codeigniter.com/wiki/Curl_library/

[b]Config:[/b] [code] <?php if (!defined('BASEPATH')) exit('No direct script access allowed');

$config['vat_checker_requester_ms'] = 'PT'; $config['vat_checker_requester_iso'] = 'PT'; $config['vat_checker_requester_vat'] = '000000000'; [/code]

[b]Library:[/b] [code] <?php if (!defined('BASEPATH')) exit('No direct script access allowed'); /**

• European vat validation
• @author Manuel João Silva mail[at]manueljoaosilva.com
• @version 1.0
• @uses http://codeigniter.com/wiki/Curl_library/

*/ class Vat_checker { var $CI;

/**
 * Contructor: Loads curl library and vat_checker config
 *
 * @return void
 */
function Vat_checker()
{
    $this->CI =& get_instance();
    $this->CI->load->library('curl');
    $this->CI->config->load('vat_checker');
}

/**
 * Validates againt http://ec.europa.eu/taxation_customs/vies/ 
 * if vat number is valid. If it's valid 
 * returns Consultation Number for tracking porpuses
 *
 * @param string $vat
 * @param string $country_iso
 * @return string or boolean
 */
function is_valid_europa($vat, $country_iso)
{
    $country_iso = strtoupper($country_iso);
    $vat = str_replace($country_iso, '', $vat);

    $post = array(
    'ms' => $country_iso,
    'iso' => $country_iso,
    'vat' => $vat,
    'requesterMs' =>  $this->CI->config->item('vat_checker_requester_ms'),
    'requesterIso' => $this->CI->config->item('vat_checker_requester_iso'),
    'requesterVat' => $this->CI->config->item('vat_checker_requester_vat'),
    'BtnSubmitVat' => 'Verify'
    );

    $resp = $this->CI->curl->simple_post('http://ec.europa.eu/taxation_customs/vies/viesquer.do', $post);

    if (preg_match('/\svalid\sVAT\s/',$resp))
    {
        preg_match_all('/(WAPIAAAA.*)/', $resp, $match);
        return trim($match[0][0]);
    }
    else
    {
        return FALSE;
    }
}

/**
 * Based on rules in http://ec.europa.eu/taxation_customs/vies/faqvies.do
 * check if nif is valid
 *
 * @param string $vat
 * @param string $country_iso
 * @return boolean
 */

function is_valid_regex($vat, $country_iso)
{

    $country_iso = strtoupper($country_iso);
    $regex = '';

    switch ($country_iso)
    {
        case 'AT':
            $regex = '/^U[0-9]{8}$/';
            break;
        case 'BE':
            $regex = '/^0?[0-9]{*}$/';
            break;
        case 'CZ':
            $regex = '/^[0-9]{8,10}$/';
            break;
        case 'DE':
            $regex = '/^[0-9]{9}$/';
            break;
        case 'CY':
            $regex = '/^[0-9]{8}[A-Z]$/';
            break;
        case 'DK':
            $regex = '/^[0-9]{8}$/';
            break;
        case 'EE':
            $regex = '/^[0-9]{9}$/';
            break;
        case 'GR':
            $regex = '/^[0-9]{9}$/';
            break;
        case 'ES':
            $regex = '/^[0-9A-Z][0-9]{7}[0-9A-Z]$/';
            break;
        case 'FI':
            $regex = '/^[0-9]{8}$/';
            break;
        case 'FR':
            $regex = '/^[0-9A-Z]{2}[0-9]{9}$/';
            break;
        case 'GB':
            $regex = '/^([0-9]{9}|[0-9]{12})~(GD|HA)[0-9]{3}$/';
            break;
        case 'HU':
            $regex = '/^[0-9]{8}$/';
            break;
        case 'IE':
            $regex = '/^[0-9][A-Z0-9\\+\\*][0-9]{5}[A-Z]$/';
            break;
        case 'IT':
            $regex = '/^[0-9]{11}$/';
            break;
        case 'LT':
            $regex = '/^([0-9]{9}|[0-9]{12})$/';
            break;
        case 'LU':
            $regex = '/^[0-9]{8}$/';
            break;
        case 'LV':
            $regex = '/^[0-9]{11}$/';
            break;
        case 'MT':
            $regex = '/^[0-9]{8}$/';
            break;
        case 'NL':
            $regex = '/^[0-9]{9}B[0-9]{2}$/';
            break;
        case 'PL':
            $regex = '/^[0-9]{10}$/';
            break;
        case 'PT':
            $regex = '/^[0-9]{9}$/';
            break;
        case 'SE':
            $regex = '/^[0-9]{12}$/';
            break;
        case 'SI':
            $regex = '/^[0-9]{8}$/';
            break;
        case 'SK':
            $regex = '/^[0-9]{10}$/';
            break;
        default:
            return FALSE;
            break;
    }
    
    $vat = str_replace($country_iso, '', $vat);
    return (preg_match($regex,$vat));
}

} [/code]