php使用$ _get命令获取外键

Question

用户已在db中注册。当我通过在网络上输入必要信息提交时，它将刷新并且不会将数据存储在数据库中。我认为$ _get命令有问题。我试图接收作为该表的外键的id并将数据存储到数据库中。

<? include_once 'session.php';
include_once 'newtryconn.php';
include_once 'utilities.php';

if(isset($_POST['preferences'])){
    $religion = $_POST['religion'];
    $home = $_POST['home'];
    $occuption = $_POST['occuption'];
    $roommates = $_POST['roommates'];
    $phone = $_POST['phone'];
    if(isset($_GET['id'])) {
        $id = $_GET['id'];

        $sqlInsert = "INSERT INTO preferences (religion, home, occuption, roommates, phone, id)
        VALUES (:religion, :home, :occuption, :roommates, :phone, :id)";

            //use PDO prepared to sanitize data
        $statement = $db->prepare($sqlInsert);

        //add the data into the database
        $statement->execute(array(':religion' => $religion, ':home' => $home, ':occuption' => $occuption, ':roommates' => $roommates, ':phone' => $phone, ':id' => $id));
        header("location: homepage.php");
}
}  


?>