Think best solution is to use the XML-RPC of wordpress with this PHP client:

Here is the code to add a new Wordpress Blog Post and retrieve the URL:

    require_once \'WordpressClient.php\';
require_once(\'.\\Exception\\NetworkException.php\');
require_once(\'.\\Exception\\XmlrpcException.php\');
$endpoint = \\\"http://www.example.com/xmlrpc.php\\\";
$wpUser = \'username\';
$wpPass = \'password\';
$YourCategoryID = 5;
$wpClient = new \\HieuLe\\WordpressXmlrpcClient\\WordpressClient();
$wpClient->setCredentials($endpoint, $wpUser, $wpPass);
$title=\\\"Your Blog Post Title\\\";
$title = htmlentities( $title, ENT_NOQUOTES, \'UTF-8\' );
$body=\'Your HTML coded article\';
$content = array(
\'post_category\' => array( $YourCategoryID ), // my category id
\'post_type\' => \'post\',
\'post_status\' => \'published\',
\'post_title\' => $title,
\'post_content\' => $body,
\'ping_status\' => \'closed\',
\'comment_status\' => \'closed\',
);
$result=$wpClient->newPost($title,$body,$content);
$postname=$wpClient->getPost($result);
$new_post_url_slug=$postname[\'post_name\'];