将会话数据存储到数据库中的问题

Question

我想用来自表名customer的外键将会话数据存储到名为order的数据库表中，但数据未存储在order表中。无法理解原因。

<?php 
  session_start();
  $conn= mysqli_connect("localhost","root","","onlinestore");
  if(isset($_POST['customer']))
    {
        $fname= $_POST['fname'];
        $lname= $_POST['lname'];
        $email= $_POST['email'];
        $country= $_POST['country'];
        $city= $_POST['city'];
        $address= $_POST['address'];
        $zipcode= $_POST['zipcode'];
        $phone_no= $_POST['phone_no'];

        $query="insert into 
        customer(fname,lname,email,country,city,address,zip_code,phone_no) 
        values('$fname', '$lname', '$email', '$country', '$city', '$address',   
        '$zipcode', '$phone_no')";
        $result= mysqli_query($conn, $query);
        $c_id= mysqli_insert_id($conn);
        echo $c_id;
        $query1="";
        if(isset($_SESSION['shopping_cart']))
          {
             foreach($_SESSION['shopping_cart'] as $key=> $rows){
                $id= $rows['id'];
                $name= $rows['name'];
                $image= $rows['image'];
                $price= $rows['price'];
                $quantity= $rows['quantity'];
                $c_id= mysqli_insert_id($conn);
                $query1.="insert into 
                order(order_id,name,image,price,qty,customer_id) 
                values('$id','$name','$image','$price','$quantity','$c_id')";
            }
                if(mysqli_multi_query($conn,$query1))
                {
                 echo "data inserted";}

        }

    }

?>