Ublaboo\DataGrid\DataGrid::getPerPage PHP Method

    public function getPerPage()
    {
        $items_per_page_list = $this->getItemsPerPageList();
        $per_page = $this->per_page ?: reset($items_per_page_list);
        if ($per_page !== 'all' && !in_array($this->per_page, $items_per_page_list)) {
            $per_page = reset($items_per_page_list);
        }
        return $per_page;
    }