$post = $api->posts->create(
    array(
        'title'          => 'Test Article ' . date('c'),
        'content_raw'    => 'Test Article Description ' . date('c'),
        'date'           => date('c', time()),
        'status'         => 'publish',
        'comment_status' => 'closed'
    )
);
var_dump($post);
$ret = $post->update(
    array(
        'title'          => 'Test Article Updated ' . date('c'),
        'content_raw'    => 'Test Article Description Updated ' . date('c'),
    )
);
var_dump($ret);