Wobei dann dauert es aber auch
einwenig länger und der User hat ganz kleine Verzögerungen.

<?php
/**
* This functions tries to resolve the IPv4 address for a hostname. It uses PHP's dns_get_record()
* because in my benchmarks this function was faster than gethostbyname. However, dns_get_record()
* does not work on Windows nor *BSD, so a fallback to gethostbyname() is implemented.
*
* @param  integer $domain: The domain.
* @return mixed: The IPv4 address or false if the query failed.
*/
$operating_system = strtolower(php_uname('s'));
if(strpos($operating_system, 'windows') !== false || strpos($operating_system, 'bsd') !== false) {
function resolve_ipv4($domain) {
 $bad_ip_addresses = array(
  '206.112.100.132', // http://slashdot.org/article.pl?sid=07/02/15/0432259
  '208.67.219.40', '208.67.219.41', '208.69.32.130' // http://www.opendns.com/faq/#do_you_wildcard_domains
 );
 $ip_address = gethostbyname($domain);
 if($ip_address != $domain && !in_array($ip_address, $bad_ip_addresses)) {
  return $ip_address;
 } else {
  return false;
 }
}
} else {
function resolve_ipv4($domain) {
 $bad_ip_addresses = array(
  '206.112.100.132', // http://slashdot.org/article.pl?sid=07/02/15/0432259
  '208.67.219.40', '208.67.219.41', '208.69.32.130' // http://www.opendns.com/faq/#do_you_wildcard_domains
 );
 $dns_data = @dns_get_record($domain, DNS_A);
 if(is_array($dns_data) && array_key_exists(0, $dns_data) && !in_array($dns_data[0]['ip'], $bad_ip_addresses)) {
  return $dns_data[0]['ip'];
 } else {
  return false;
 }
}
}
?>