Extends Laravel's validator to check if a value is a "real" domain pointing to specific servers

RealdomainValidator.php

Validator::extend('realdomain', function ($attribute, $value, $parameters) {
    $domain = idn_to_ascii($value);

    // Basic "is domain" check
    if (filter_var('http://' . $domain, FILTER_VALIDATE_URL) === false) {
        return false;
    }

    // Grab the A records and CNAMES
    $records = dns_get_record($domain, DNS_ALL);

    foreach($records as $record) {
        if ($record['type'] == 'A') {
            if ($record['ip'] == 'VALID_IP_ADDRESS') {
                return true;
            }
        } elseif ($record['type'] == 'CNAME') {
            if ($record['target'] == 'VALID_CNAME') {
                return true;
            }
        }
    }

    return false;
});