wxr_authors_list( int[] $post_ids = null )

404	function wxr_authors_list( ?array $post_ids = null ) {405		global $wpdb;406 407		if ( ! empty( $post_ids ) ) {408			$post_ids = array_map( 'absint', $post_ids );409			$and      = 'AND ID IN ( ' . implode( ', ', $post_ids ) . ')';410		} else {411			$and = '';412		}413 414		$authors = array();415		$results = $wpdb->get_results( "SELECT DISTINCT post_author FROM $wpdb->posts WHERE post_status != 'auto-draft' $and" );416		foreach ( (array) $results as $result ) {417			$authors[] = get_userdata( $result->post_author );418		}419 420		$authors = array_filter( $authors );421 422		foreach ( $authors as $author ) {423			echo "\t<wp:author>";424			echo '<wp:author_id>' . (int) $author->ID . '</wp:author_id>';425			echo '<wp:author_login>' . wxr_cdata( $author->user_login ) . '</wp:author_login>';426			echo '<wp:author_email>' . wxr_cdata( $author->user_email ) . '</wp:author_email>';427			echo '<wp:author_display_name>' . wxr_cdata( $author->display_name ) . '</wp:author_display_name>';428			echo '<wp:author_first_name>' . wxr_cdata( $author->first_name ) . '</wp:author_first_name>';429			echo '<wp:author_last_name>' . wxr_cdata( $author->last_name ) . '</wp:author_last_name>';430			echo "</wp:author>\n";431		}432	}