Get domain name from full URL

<?php

function getdomainname($url)
{
  $pieces = parse_url($url);
  $domain = isset($pieces['host']) ? $pieces['host'] : '';
  if (preg_match('/(?P<domain>[a-z0-9][a-z0-9\-]{1,63}\.[a-z\.]{2,6})$/i', $domain, $regs)) {
    return $regs['domain'];
  }
  return false;
}

print getdomainname("http://gauravraimca.blogspot.com/feeds/posts/default?alt=rss"); // outputs 'blogspot.com'

?>