WooCommerce Customer/Order CSV Export - Add %%order_numbers%% filename variable to support Sequential Order Numbers Pro order numbers in filename :)

wc-customer-order-csv-export-modify-filename-variables.php

<?php
function wc_csv_export_edit_filename( $post_replace_filename, $pre_replace_filename, $order_ids ) {
 
 	// only for orders
 	if ( false !== strpos( $pre_replace_filename, '%%order_numbers%%' ) ) {
 	
 		$order_numbers = array();
	
		foreach ( $order_ids as $id ) {
		
			$order = new WC_Order( $id );
		
			$order_numbers[] = $order->get_order_number();
		}
		
		$post_replace_filename = str_replace( '%%order_numbers%%', implode( '-', $order_numbers ), $post_replace_filename );
 	}
 	
 	return $post_replace_filename;
}
add_filter( 'wc_customer_order_csv_export_filename', 'wc_csv_export_edit_filename', 10, 3 );