VIES VAT checker service (uses europe.eu)

VatCheckerService.php

<?php

/*
 * Installation (Symfony):
 * =======================
 * # services.yml
 * services:
 *     # ...
 *     acme.vat_checker:
 *         class: Acme\AcmeBundle\Service\VatCheckerService
 *         calls: [ [setupDependencies, [@logger]] ]
 *
 * Usage (Symfony):
 * ================
 * $vatChecker = $this->get("acme.vat_checker");
 * $vatCheckerResponse = $vatChecker->check($vatId);
 * $countryCode = $vatCheckerResponse->countryCode;
 */

namespace Acme\AcmeBundle\Service;

use Psr\Log\LoggerInterface;

class VatCheckerService
{
    private $logger;

    public function setupDependencies(LoggerInterface $logger)
    {
        $this->logger = $logger;
    }

    public function check($vatId)
    {
        $response = new \stdClass();
        $response->countryCode = null;

        if ($vatId) {
            $vatId = \str_replace(array(" ", ".", "-", ",", ", "), "", \trim($vatId));
            $countryCode = \substr($vatId, 0, 2);
            $vatNumber = \substr($vatId, 2);
            $client = new \SoapClient("http://ec.europa.eu/taxation_customs/vies/checkVatService.wsdl");

            if ($client) {
                try {
                    $response = $client->checkVat(array("countryCode" => $countryCode, "vatNumber" => $vatNumber));

                    if (false === $response->valid) {
                        return null;
                    }
                } catch (\SoapFault $ex) {
                    // most probably vat country not in EU
                    $error = $ex->faultstring;

                    $this->logger->error($error);

                    if (!\ctype_alpha($countryCode)) {
                        $response->countryCode = null;
                    } else {
                        $response->countryCode = $countryCode;
                    }
                }
            } else {
                $this->logger->error("VATChecker error: Could not connect to host (europe.eu down?)");

                return null;
            }
        }

        return $response;
    }
}