<?php session_start(); include('../../config/database.php'); $category_id = $_GET['category_id']; if(!empty($category_id)) { echo '<option value="">Select Subcategory</option>'; $sqlSubcategory = mysqli_query($cn,"select * from `tbl_subcategory` where `category_id`='".$category_id."'"); while($sqlSubcategoryData = mysqli_fetch_array($sqlSubcategory)){ echo '<option value="'.$sqlSubcategoryData['id'].'">'.ucfirst($sqlSubcategoryData['name']).'</option>'; } } ?>