wp_xmlrpc_server::mt_setPostCategories( array $args )

	public function mt_setPostCategories( $args ) {
		$this->escape( $args );

		$post_ID    = (int) $args[0];
		$username   = $args[1];
		$password   = $args[2];
		$categories = $args[3];

		if ( !$user = $this->login($username, $password) )
			return $this->error;

		/** This action is documented in wp-includes/class-wp-xmlrpc-server.php */
		do_action( 'xmlrpc_call', 'mt.setPostCategories' );

		if ( ! get_post( $post_ID ) )
			return new IXR_Error( 404, __( 'Invalid post ID.' ) );

		if ( !current_user_can('edit_post', $post_ID) )
			return new IXR_Error(401, __('Sorry, you are not allowed to edit this post.'));

		$catids = array();
		foreach ( $categories as $cat ) {
			$catids[] = $cat['categoryId'];
		}

		wp_set_post_categories($post_ID, $catids);

		return true;
	}