Create a bank customer account database with name, account number, mobile number, address and so on. Create a login page through which customer can access his account details. If the customer is new and wants to access account information, create a registration form with the required data. For this create a proper database of the customer registration and apply proper validations at server side using PHP filter. Once customer get registered, he can use his login id and password to access his account information. During the registration, the customer id and password must be verified with the database. If it is correct then it will allow to access the customer information followed by welcome message. If the customer id and password is incorrect then display not registered customer (or any appropriate message). If it is correct link to the customer account database.