Add cache, to save traffic to VIES service and improve performance about vies HOT 2 CLOSED

// We instantiate the VIES service (or use DI)
$vies = new DragonBe\Vies\Vies();

// We create a unique cache key based on the country code and VAT number
$cacheKey = $countryCode . $vatNumber;

// Cached data is an array formed by $cacheKey and the VAT validation result
$cacheHit = [$cacheKey => false];

// Our cache routine
if (false === ($cacheHit = $this->getCache()->load($cacheKey))) {
    try {
        $validationResult = $vies->validateVat($countryCode, $vatNumber);

        // Since the cache also returns false on a cache miss, we need to be creative
        // storing the result.
        $this->getCache()->save($cacheKey, [$cacheKey => $validationResult]);
    } catch (SoapException $soapException) {
        $this->getLogger()->crit($soapException->getMessage());
    }
}

return $cacheHit[$cacheKey]; // returns true or false