protected function export_column_headers() {
		$columns    = $this->get_column_names();
		$export_row = array();
		$buffer     = fopen( 'php://output', 'w' ); // phpcs:ignore WordPress.WP.AlternativeFunctions.file_system_read_fopen
		ob_start();

		foreach ( $columns as $column_id => $column_name ) {
			if ( ! $this->is_column_exporting( $column_id ) ) {
				continue;
			}
			$export_row[] = $this->format_data( $column_name );
		}

		$this->fputcsv( $buffer, $export_row );

		return ob_get_clean();
	}