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copied!<p>For this project: <a href="http://drupal.org/project/parallel" rel="nofollow noreferrer">http://drupal.org/project/parallel</a></p> <p>Usage:</p> <pre><code>echo parallel_get_domain("www.robknight.org.uk") . "<br>"; echo parallel_get_domain("www.google.com") . "<br>"; echo parallel_get_domain("www.yahoo.com") . "<br>"; </code></pre> <p>Functions:</p> <pre><code>/** * Given host name returns top domain. * * @param $host * String containing the host name: www.example.com * * @return string * top domain: example.com */ function parallel_get_domain($host) { if (strtoupper(substr(PHP_OS, 0, 3)) == 'WIN' && strnatcmp(phpversion(),'5.3.0') < 0) { // This works 1/2 the time... CNAME doesn't work with nslookup for ($end_pieces = substr_count($host, '.'); $end_pieces > 0; $end_pieces--) { $test_domain = end(explode('.', $host, $end_pieces)); if (checkdnsrr($test_domain)) { $domain = $test_domain; break; } } return isset($domain) ? $domain : FALSE; } else { // This always works $sections = explode('.', $host); array_unshift($sections, ''); foreach($sections as $key => $value) { $parts[$key] = $value; $test_domain = implode('.', parallel_array_xor($parts, $sections)); if (checkdnsrr($test_domain, 'NS') && !checkdnsrr($test_domain, 'CNAME')) { $domain = $test_domain; break; } } return isset($domain) ? $domain : FALSE; } } /** * Opposite of array_intersect(). * * @param $array_a * First array * @param $array_b * Second array * * @return array */ function parallel_array_xor ($array_a, $array_b) { $union_array = array_merge($array_a, $array_b); $intersect_array = array_intersect($array_a, $array_b); return array_diff($union_array, $intersect_array); } /** * Win compatible version of checkdnsrr. * * checkdnsrr() support for Windows by HM2K <php [spat] hm2k.org> * http://us2.php.net/manual/en/function.checkdnsrr.php#88301 * * @param $host * String containing host name * @param $type * String containing the DNS record type * * @return bool */ function parallel_win_checkdnsrr($host, $type='MX') { if (strtoupper(substr(PHP_OS, 0, 3)) != 'WIN') { return FALSE; } if (empty($host)) { return FALSE; } $types=array('A', 'MX', 'NS', 'SOA', 'PTR', 'CNAME', 'AAAA', 'A6', 'SRV', 'NAPTR', 'TXT', 'ANY'); if (!in_array($type, $types)) { user_error("checkdnsrr() Type '$type' not supported", E_USER_WARNING); return FALSE; } @exec('nslookup -type=' . $type . ' ' . escapeshellcmd($host), $output); foreach($output as $line){ if (preg_match('/^' . $host . '/', $line)) { return TRUE; } } } // Define checkdnsrr() if it doesn't exist if (!function_exists('checkdnsrr')) { function checkdnsrr($host, $type='MX') { return parallel_win_checkdnsrr($host, $type); } } </code></pre> <p>Output - Windows:</p> <pre><code>org.uk google.com yahoo.com </code></pre> <p>Output - Linux:</p> <pre><code>robknight.org.uk google.com yahoo.com </code></pre>

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