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15 years ago
This is a function that uses regular expressions to match against the various VAT formats required across the EU.



<?php

/**

 * @param integer $country Country name

 * @param integer $vat_number VAT number to test e.g. GB123 4567 89

 * @return integer -1 if country not included OR 1 if the VAT Num matches for the country OR 0 if no match

*/

function checkVatNumber( $country, $vat_number ) {

    switch($country) {

        case 'Austria':

            $regex = '/^(AT){0,1}U[0-9]{8}$/i';

            break;

        case 'Belgium':

            $regex = '/^(BE){0,1}[0]{0,1}[0-9]{9}$/i';

            break;

        case 'Bulgaria':

            $regex = '/^(BG){0,1}[0-9]{9,10}$/i';

            break;

        case 'Cyprus':

            $regex = '/^(CY){0,1}[0-9]{8}[A-Z]$/i';

            break;

        case 'Czech Republic':

            $regex = '/^(CZ){0,1}[0-9]{8,10}$/i';

            break;

        case 'Denmark':

            $regex = '/^(DK){0,1}([0-9]{2}[\ ]{0,1}){3}[0-9]{2}$/i';

            break;

        case 'Estonia':

        case 'Germany':

        case 'Greece':

        case 'Portugal':

            $regex = '/^(EE|EL|DE|PT){0,1}[0-9]{9}$/i';

            break;

        case 'France':

            $regex = '/^(FR){0,1}[0-9A-Z]{2}[\ ]{0,1}[0-9]{9}$/i';

            break;

        case 'Finland':

        case 'Hungary':

        case 'Luxembourg':

        case 'Malta':

        case 'Slovenia':

            $regex = '/^(FI|HU|LU|MT|SI){0,1}[0-9]{8}$/i';

            break;

        case 'Ireland':

            $regex = '/^(IE){0,1}[0-9][0-9A-Z\+\*][0-9]{5}[A-Z]$/i';

            break;

        case 'Italy':

        case 'Latvia':

            $regex = '/^(IT|LV){0,1}[0-9]{11}$/i';

            break;

        case 'Lithuania':

            $regex = '/^(LT){0,1}([0-9]{9}|[0-9]{12})$/i';

            break;

        case 'Netherlands':

            $regex = '/^(NL){0,1}[0-9]{9}B[0-9]{2}$/i';

            break;

        case 'Poland':

        case 'Slovakia':

            $regex = '/^(PL|SK){0,1}[0-9]{10}$/i';

            break;

        case 'Romania':

            $regex = '/^(RO){0,1}[0-9]{2,10}$/i';

            break;

        case 'Sweden':

            $regex = '/^(SE){0,1}[0-9]{12}$/i';

            break;

        case 'Spain':

            $regex = '/^(ES){0,1}([0-9A-Z][0-9]{7}[A-Z])|([A-Z][0-9]{7}[0-9A-Z])$/i';

            break;

        case 'United Kingdom':

            $regex = '/^(GB){0,1}([1-9][0-9]{2}[\ ]{0,1}[0-9]{4}[\ ]{0,1}[0-9]{2})|([1-9][0-9]{2}[\ ]{0,1}[0-9]{4}[\ ]{0,1}[0-9]{2}[\ ]{0,1}[0-9]{3})|((GD|HA)[0-9]{3})$/i';

            break;

        default:

            return -1;

            break;

    }

    

    return preg_match($regex, $vat_number);

}

?>
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