表单中的多个字段出错

I am creating a page where user enters the details through a registration form for a bank database. If the input values exits in the database then it is redirected to the next page. The problem associated with the code below is that when the user enters the details it redirects to the same registration page. The page is accessed through a separate file where the connection with the database is already established. No problem with the connection. I have created a file 'index.php' which invokes the registration page and the php code shown below. another file core.php is referred to the index.php which contains the session_start(). The code works well when i am limiting the form to only two fields i.e cust_name & card_no. Please reply. Thanks in advance. Here is my code: I am creating a page where user enters the deta