apply_filters( 'export_wp_filename', string $wp_filename, string $sitename, string $date )

88<?php89	 * @since 4.4.090	 *91	 * @param string $wp_filename The name of the file for download.92	 * @param string $sitename    The site name.93	 * @param string $date        Today's date, formatted.94	 */95	$filename = apply_filters( 'export_wp_filename', $wp_filename, $sitename, $date );96 97	header( 'Content-Description: File Transfer' );98	header( 'Content-Disposition: attachment; filename=' . $filename );99	header( 'Content-Type: text/xml; charset=' . get_option( 'blog_charset' ), true );100 101	if ( 'all' !== $args['content'] && post_type_exists( $args['content'] ) ) {