Add WP username to EE registration CSV

gistfile1.txt

//* Add WP username to EE registration CSV ---------------------------------------------------------------*/

function ee_add_wp_username_to_csv($reg_csv_array, $reg_row) {
	//d($reg_row);
	$reg_csv_array['WP Username'] = '';
	$primary_reg = $reg_row[ 'Registration.REG_count' ] == '1' ? true : false;
	if( $primary_reg ) {
		$user_id = EE_WPUsers::get_attendee_user($reg_row['Registration.ATT_ID']);
		//d($user_id);
		if( $user_id != false ) {
			$user = get_userdata( $user_id );
			//d($user);
			if( $user instanceof WP_User ) {
				//d($user_id);
				$reg_csv_array['WP Username'] = $user->user_login;
			}
		}
	}
	return $reg_csv_array;
}
add_filter( 'FHEE__EventEspressoBatchRequest__JobHandlers__RegistrationsReport__reg_csv_array', 'ee_add_wp_username_to_csv', 10, 2 );