get_changeset_post_data example

public function changeset_data() {
        if ( isset( $this->_changeset_data ) ) {
            return $this->_changeset_data;
        }
        $changeset_post_id = $this->changeset_post_id();
        if ( ! $changeset_post_id ) {
            $this->_changeset_data = array();
        } else {
            if ( $this->autosaved() && is_user_logged_in() ) {
                $autosave_post = wp_get_post_autosave( $changeset_post_id, get_current_user_id() );
                if ( $autosave_post ) {
                    $data = $this->get_changeset_post_data( $autosave_post->ID );
                    if ( ! is_wp_error( $data ) ) {
                        $this->_changeset_data = $data;
                    }
                }
            }

            // Load data from the changeset if it was not loaded from an autosave.             if ( ! isset( $this->_changeset_data ) ) {
                $data = $this->get_changeset_post_data( $changeset_post_id );
                if ( ! is_wp_error( $data ) ) {
                    $this->_changeset_data = $data;
                }