Include the membership level name in the Members List CSV export filename.

include-level-in-members-list-export-filename.php

<?php
/**
 * Include the membership level name in the Members List CSV export filename.
 *
 * Retains the export ID in the name so the filename is unique.
 *
 * You can add this recipe to your site by creating a custom plugin
 * or using the Code Snippets plugin available for free in the WordPress repository.
 * Read this companion article for step-by-step directions on either method.
 * https://www.paidmembershipspro.com/create-a-plugin-for-pmpro-customizations/
 */

function my_pmpro_members_export_add_level_in_filename( $file_name, $type, $export_id, $filters ) {
	if ( 'members' !== $type ) {
		return $file_name;
	}

	$l = isset( $filters['l'] ) ? $filters['l'] : '';

	if ( 'oldmembers' === $l ) {
		$level_slug = 'old-members';
	} elseif ( 'expired' === $l ) {
		$level_slug = 'expired';
	} elseif ( 'cancelled' === $l ) {
		$level_slug = 'cancelled';
	} elseif ( is_numeric( $l ) ) {
		$level = pmpro_getLevel( (int) $l );
		$level_slug = ( $level && sanitize_title( $level->name ) ) ? sanitize_title( $level->name ) : 'level-' . (int) $l;
	} else {
		$level_slug = 'all-active-members';
	}

	// e.g. silver-1a2d44a8-f362-4b96-b5bd-c1eecd91b03c.csv
	return $level_slug . '-' . $export_id . '.csv';
}
add_filter( 'pmpro_export_file_name', 'my_pmpro_members_export_add_level_in_filename', 10, 4 );