为什么正确的ID没有插入表

Question

我想要下面的代码在customer_payment表中插入汽车ID，但它只选择477 ID。我不知道为什么。如图所示，只有product_id 477被插入，如果我选择500，它仍然会插入477.请帮助我获得此帮助。谢谢

include 'admin/db.php'; 

if(isset($_GET['payment_here'])){ 

    //select product id from cart 
    $select_cart = "select * from cart"; 
    $runcart = mysqli_query($conn, $select_cart); 
    $cartwhile=mysqli_fetch_assoc($runcart); 

    $carssid = $cartwhile['P_ID']; 
    $cusid = $cartwhile['C_ID']; 

    //select id from cars 
    $scars = "select * from cars where id=$carssid"; 
    $scarsrun = mysqli_query($conn, $scars); 
    $showcars = mysqli_fetch_assoc($scarsrun); 
    $carsdealer = $showcars['dealer']; 


    //select customer id from customer table 
    //$selectcust = "select * from customer_register where id=$cusid"; 
    //insert data into customer payment table 
    echo $insertpay = "insert into customer_payment 
    (Product_id, customer_id, dealer) 
    values ($carssid," . $_SESSION['customer_id'] . ", '$carsdealer')"; 
    $run_inserts = mysqli_query($conn, $insertpay); 
    /* 
    if($run_inserts){ 
     echo "<script>window.location.href = 'checkout.php'</script>"; 
    } 
    */ 
} 
?> 

Answer 1

你正在尝试被取出由它总是将是相同的“车”表中的第一个条目这里

$select_cart = "select * from cart"; 
$runcart = mysqli_query($conn, $select_cart); 
$cartwhile=mysqli_fetch_assoc($runcart); // here 

做。

你可以尝试这样的事情。

$c_id = $_SESSION['customer_id']; 
$select_cart = "select * from cart where C_ID=$c_id"; 
$runcart = mysqli_query($conn, $select_cart); 
$cartwhile=mysqli_fetch_assoc($runcart); 

该查询将专门为当前会话的客户提取数据。 您可以使用的其余代码是。