<?php
include 'config.php';
$q=$_REQUEST["q"];
$sql="SELECT * FROM subcategory WHERE cat_id= '".$q."'";
$result = mysqli_query($con,$sql);
?>
<select class="form-group">
<?php
while($row = mysqli_fetch_array($result))
{
?>
<option value="">select Subcategory</option>
<option value="<?php echo $row['subcat_id'];?>" selected="selected"><?php echo $row['subcat_name'];?></option>
<?php
}
?>
</select>
<html>
<body>