engineN/app/Helpers/myhelper_helper.php

<?php
if (!function_exists('nomor')) {
    function nomor($currentPage, $perPage)
    {
        if (is_null($currentPage)) {
            $nomor = 1;
        } else {
            $nomor = 1 + ($perPage * ($currentPage - 1));
        }
        return $nomor;
    }
}