<?php $res1 = ADAO::viewBrands(); foreach ($res1 as $row1) { ?> <div class="left-nav"> <b><?php echo $row1['value']; ?> </b> <?php $res2 = ADAO::getProductCategoriesByBrand($row1['id']); if (is_array($res2)) { ?> <ul> <?php foreach ($res2 as $row2) { ?> <li><a href="show_products.php?id_main=<?php echo $row2['id']; ?> &brand_id_main=<?php echo $row2['brand_id']; ?> "><?php echo $row2['value']; ?> </a> <?php if (isset($_GET['id_main']) && isset($_GET['brand_id_main']) && $row2['id'] == $_GET['id_main']) {