public function &pagination($current_page = 1, $items_per_page = 100)
    {
        $this->is_paginated = true;

        $this->currentPage($current_page);

        $this->items_per_page = (int) $items_per_page;

        if ($this->items_per_page < 1) {
            $this->items_per_page = 100;
        }

        return $this;
    }