WP_REST_Edit_Site_Export_Controller::export() WordPress Method

	public function export() {
		// Generate the export file.
		$filename = wp_generate_block_templates_export_file();

		if ( is_wp_error( $filename ) ) {
			$filename->add_data( array( 'status' => 500 ) );

			return $filename;
		}

		$theme_name = basename( get_stylesheet() );
		header( 'Content-Type: application/zip' );
		header( 'Content-Disposition: attachment; filename=' . $theme_name . '.zip' );
		header( 'Content-Length: ' . filesize( $filename ) );
		flush();
		readfile( $filename );
		unlink( $filename );
		exit;
	}