Exclude fields from the registration CSV export.

ee_exclude_fields_registration_export.php

<?php
/*
Plugin Name: Exclude custom fields from EE registrations export.
Description: Allows you to set felds that will be excluded from the registrations CSV export file.
Author: Tony Warwick
Version: 1.0
*/

function ee_exclude_custom_fields_from_export($reg_csv_array, $reg_row) {
	$fields_to_exclude_from_csv = array(
		//Add the fields you wish to exclude from the CSV here.
		//These excluded fields are an example of how to remove fields, your list will be different.
		'Payment Date(s)',
		'Payment Method(s)',
		'Gateway Transaction ID(s)',
		'Check-Ins',
	);

	foreach( $fields_to_exclude_from_csv as $single_field_to_exclude ) {

		//For each field within $fields_to_exclude_from_csv, check if that value is within the array.
		if ( array_key_exists( $single_field_to_exclude, $reg_csv_array )) {

			//If the field is set remove it from the array.
			unset( $reg_csv_array[$single_field_to_exclude] );
		}

	}

	return $reg_csv_array;
}
add_filter( 'FHEE__EE_Export__report_registrations__reg_csv_array', 'ee_exclude_custom_fields_from_export', 100, 2 );