Drupal can automatically send notifications (called \"pings\") to the following sites to tell them that your site has changed. To do so, Drupal implements the %weblogs-XML.

%weblogs, a web site that tracks and displays links to changed weblogs and news-oriented web sites. Many services use %weblogs to determine if a site has been recently updated.
%weblogs-RSS for RSS, a web site that tracks and displays links to recently changed RSS feeds in XML format.
%blo-gs, a directory of recently updated weblogs and tools for tracking interesting weblogs, in the spirit of services like %weblogs, %blogtracker and %blogrolling. To get your Drupal site listed, %blo-gs must be informed about your site's updates. This is the job of the ping module and when installed, the administrator doesn't have to do anything to participate in the %blo-gs system.
%technorati, a web site that tracks links between websites in real time, and can answer the question 'who linked to me in the last hour?'
%yahoo users can track RSS feeds, so when it is pinged, %yahoo will immediately queue up refreshing your site's RSS feed so that it displays your latest content to its users.

The ping feature requires crontab.

", array('%weblogs' => 'Weblogs.com', '%weblogs-XML' => ''. t('XML-RPC interface of weblogs.com') .'', '%weblogs-RSS' => ''. t('Weblogs.Com for RSS') .'', '%weblogs-RSS-changes' => ''. t('the weblogs.com for RSS') .'', '%blo-gs' => 'blo.gs','%blogtracker' => 'blogtracker', '%blogrolling' => 'blogrolling.com', '%blo-gs-XML' => ''. t('XML-RPC interface of blo.gs').'', '%technorati' => ''. t("Technorati"). '', '%yahoo' => 'My Yahoo!')); break; case 'admin/modules#description': $output = t('Alerts other sites that your site has been updated.'); break; } return $output; } /** * Implementation of hook_cron(). * * Fire off notifications of updates to remote sites. */ function ping_cron() { global $base_url; if (variable_get('site_name', 0) && variable_get('site_slogan', 0)) { if (db_num_rows(db_query("SELECT nid FROM {node} WHERE status = 1 AND moderate = 0 AND (created > '". variable_get('ping_cron_last', time()) ."' OR changed > '". variable_get('ping_cron_last', time()) ."')"), 1)) { _ping_notify(variable_get('site_name', '') .' - '. variable_get('site_slogan', ''), $base_url); } variable_set('ping_cron_last', time()); } } /** * Call hook_ping() in all modules to notify remote sites that there is * new content at this one. */ function _ping_notify($name, $url) { module_invoke_all('ping', $name, $url); } /** * Implementation of hook_ping(). * * Notifies weblogs.com, blo.gs, and technorati.com of changes at this site. */ function ping_ping($name = '', $url = '') { $feed = url('node/feed', NULL, NULL, TRUE); $client = new xmlrpc_client('/RPC2', 'rpc.weblogs.com', 80); $message = new xmlrpcmsg('weblogUpdates.ping', array(new xmlrpcval($name), new xmlrpcval($url))); $result = $client->send($message); if (!$result || $result->faultCode()) { watchdog('error', t('Failed to notify weblogs.com (site).')); } unset($client); $client = new xmlrpc_client('/RPC2', 'rssrpc.weblogs.com', 80); $message = new xmlrpcmsg('rssUpdate', array(new xmlrpcval($name), new xmlrpcval($feed))); $result = $client->send($message); if (!$result || $result->faultCode()) { watchdog('error', t('Failed to notify weblogs.com (RSS).')); } unset($client); $client = new xmlrpc_client('/', 'ping.blo.gs', 80); $message = new xmlrpcmsg('weblogUpdates.extendedPing', array(new xmlrpcval($name), new xmlrpcval($url), new xmlrpcval($url), new xmlrpcval($feed))); $result = $client->send($message); if (!$result || $result->faultCode()) { watchdog('error', t('Failed to notify blo.gs.')); } unset($client); $client = new xmlrpc_client('/rpc/ping', 'rpc.technorati.com', 80); $message = new xmlrpcmsg('weblogUpdates.ping', array(new xmlrpcval($name), new xmlrpcval($url))); $result = $client->send($message); if (!$result || $result->faultCode()) { watchdog('error', t('Failed to notify technorati.com.')); } unset($client); $client = new xmlrpc_client('/RPC2', 'api.my.yahoo.com', 80); $message = new xmlrpcmsg('weblogUpdates.ping', array(new xmlrpcval($name), new xmlrpcval($feed))); $result = $client->send($message); if (!$result || $result->faultCode()) { watchdog('error', t('Failed to notify yahoo.com.')); } } ?>