<?php
	include'includes/db-conn.inc.php';
	$category_id=$_POST["category_id"];
	$result = mysqli_query($conn," select * from tbl_subcategory where category_id='$category_id' order by name")or die(mysqli_error($conn));;
?>

<?php
while($rows = mysqli_fetch_assoc($result)) {
?>
	<option value="<?php echo $rows["id"];?>"><?php echo $rows["name"];?></option>
<?php
}
?>