<?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'] == $_GET['id_main']) { if (ADAO::isProductsExists($_GET['id_main'])) { $res3 = ADAO::getAllProductsByCat($row2['id'], $brand_id_main); if (is_array($res3)) { ?> <ul> <?php foreach ($res3 as $row3) { ?> <li><a href="product_detail.php?id=<?php echo $row3['id']; ?> &cat_id=<?php echo $row3['cat_id']; ?> &brand_id=<?php