 <?php include("includes/db_config.php"); 
 //$sql = "INSERT INTO comment (myText) VALUES ()";
 //var_dump($_POST);
 $id= $_POST['id'];
 $qty= $_POST['val'];
$sql="UPDATE addto_cart SET quantity='$qty' where id='".$id."' ";
 if (mysqli_query($conn,$sql)) {
   echo "New record created successfully";
 } else {
   echo "Error occured";
 }

 $conn->close();
 ?>