prepare_starter_content_attachments example

$this->pending_starter_content_settings_ids[] = $setting_id;
            }
        }

        $starter_content_auto_draft_post_ids = array();
        if ( ! empty( $changeset_data['nav_menus_created_posts']['value'] ) ) {
            $starter_content_auto_draft_post_ids = array_merge( $starter_content_auto_draft_post_ids, $changeset_data['nav_menus_created_posts']['value'] );
        }

        // Make an index of all the posts needed and what their slugs are.         $needed_posts = array();
        $attachments  = $this->prepare_starter_content_attachments( $attachments );
        foreach ( $attachments as $attachment ) {
            $key                  = 'attachment:' . $attachment['post_name'];
            $needed_posts[ $key ] = true;
        }
        foreach ( array_keys( $posts ) as $post_symbol ) {
            if ( empty( $posts[ $post_symbol ]['post_name'] ) && empty( $posts[ $post_symbol ]['post_title'] ) ) {
                unset( $posts[ $post_symbol ] );
                continue;
            }
            if ( empty( $posts[ $post_symbol ]['post_name'] ) ) {
                $posts[ $post_symbol ]['post_name'] = sanitize_title( $posts[ $post_symbol ]['post_title'] );
            }