__ http://pear.php.net/package/Net_URL2
__ http://pear.php.net/package/HTTP_Request2
__ https://github.com/pear2/Services_Pingback
__ http://pear.php.net/package/Net_URL2
__ http://pear.php.net/package/HTTP_Request2
__ https://github.com/pear2/Services_Pingback